diff -r 000000000000 -r 6474c204b198 dom/imptests/idlharness.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/imptests/idlharness.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,1884 @@
+/*
+Distributed under both the W3C Test Suite License [1] and the W3C
+3-clause BSD License [2]. To contribute to a W3C Test Suite, see the
+policies and contribution forms [3].
+
+[1] http://www.w3.org/Consortium/Legal/2008/04-testsuite-license
+[2] http://www.w3.org/Consortium/Legal/2008/03-bsd-license
+[3] http://www.w3.org/2004/10/27-testcases
+*/
+
+/*
+ * This file automatically generates browser tests for WebIDL interfaces, using
+ * the testharness.js framework.  To use, first include the following:
+ *
+ *   <script src=/resources/testharness.js></script>
+ *   <script src=/resources/testharnessreport.js></script>
+ *   <script src=/resources/WebIDLParser.js></script>
+ *   <script src=/resources/idlharness.js></script>
+ *
+ * Then you'll need some type of IDLs.  Here's some script that can be run on a
+ * spec written in HTML, which will grab all the elements with class="idl",
+ * concatenate them, and replace the body so you can copy-paste:
+ *
+     var s = "";
+     [].forEach.call(document.getElementsByClassName("idl"), function(idl) {
+       //https://www.w3.org/Bugs/Public/show_bug.cgi?id=14914
+       if (!idl.classList.contains("extract"))
+       {
+         s += idl.textContent + "\n\n";
+       }
+     });
+     document.body.innerHTML = '<pre></pre>';
+     document.body.firstChild.textContent = s;
+ *
+ * (TODO: write this in Python or something so that it can be done from the
+ * command line instead.)
+ *
+ * Once you have that, put it in your script somehow.  The easiest way is to
+ * embed it literally in an HTML file with <script type=text/plain> or similar,
+ * so that you don't have to do any escaping.  Another possibility is to put it
+ * in a separate .idl file that's fetched via XHR or similar.  Sample usage:
+ *
+ *   var idl_array = new IdlArray();
+ *   idl_array.add_untested_idls("interface Node { readonly attribute DOMString nodeName; };");
+ *   idl_array.add_idls("interface Document : Node { readonly attribute DOMString URL; };");
+ *   idl_array.add_objects({Document: ["document"]});
+ *   idl_array.test();
+ *
+ * This tests that window.Document exists and meets all the requirements of
+ * WebIDL.  It also tests that window.document (the result of evaluating the
+ * string "document") has URL and nodeName properties that behave as they
+ * should, and otherwise meets WebIDL's requirements for an object whose
+ * primary interface is Document.  It does not test that window.Node exists,
+ * which is what you want if the Node interface is already tested in some other
+ * specification's suite and your specification only extends or refers to it.
+ * Of course, each IDL string can define many different things, and calls to
+ * add_objects() can register many different objects for different interfaces:
+ * this is a very simple example.
+ *
+ * TODO: Write assert_writable, assert_enumerable, assert_configurable and
+ * their inverses, and use those instead of just checking
+ * getOwnPropertyDescriptor.
+ *
+ * == Public methods of IdlArray ==
+ *
+ * IdlArray objects can be obtained with new IdlArray().  Anything not
+ * documented in this section should be considered an implementation detail,
+ * and outside callers should not use it.
+ *
+ * add_idls(idl_string):
+ *   Parses idl_string (throwing on parse error) and adds the results to the
+ *   IdlArray.  All the definitions will be tested when you run test().  If
+ *   some of the definitions refer to other definitions, those must be present
+ *   too.  For instance, if idl_string says that Document inherits from Node,
+ *   the Node interface must also have been provided in some call to add_idls()
+ *   or add_untested_idls().
+ *
+ * add_untested_idls(idl_string):
+ *   Like add_idls(), but the definitions will not be tested.  If an untested
+ *   interface is added and then extended with a tested partial interface, the
+ *   members of the partial interface will still be tested.  Also, all the
+ *   members will still be tested for objects added with add_objects(), because
+ *   you probably want to test that (for instance) window.document has all the
+ *   properties from Node, not just Document, even if the Node interface itself
+ *   is tested in a different test suite.
+ *
+ * add_objects(dict):
+ *   dict should be an object whose keys are the names of interfaces or
+ *   exceptions, and whose values are arrays of strings.  When an interface or
+ *   exception is tested, every string registered for it with add_objects()
+ *   will be evaluated, and tests will be run on the result to verify that it
+ *   correctly implements that interface or exception.  This is the only way to
+ *   test anything about [NoInterfaceObject] interfaces, and there are many
+ *   tests that can't be run on any interface without an object to fiddle with.
+ *
+ *   The interface has to be the *primary* interface of all the objects
+ *   provided.  For example, don't pass {Node: ["document"]}, but rather
+ *   {Document: ["document"]}.  Assuming the Document interface was declared to
+ *   inherit from Node, this will automatically test that document implements
+ *   the Node interface too.
+ *
+ *   Warning: methods will be called on any provided objects, in a manner that
+ *   WebIDL requires be safe.  For instance, if a method has mandatory
+ *   arguments, the test suite will try calling it with too few arguments to
+ *   see if it throws an exception.  If an implementation incorrectly runs the
+ *   function instead of throwing, this might have side effects, possibly even
+ *   preventing the test suite from running correctly.
+ *
+ * prevent_multiple_testing(name):
+ *   This is a niche method for use in case you're testing many objects that
+ *   implement the same interfaces, and don't want to retest the same
+ *   interfaces every single time.  For instance, HTML defines many interfaces
+ *   that all inherit from HTMLElement, so the HTML test suite has something
+ *   like
+ *     .add_objects({
+ *         HTMLHtmlElement: ['document.documentElement'],
+ *         HTMLHeadElement: ['document.head'],
+ *         HTMLBodyElement: ['document.body'],
+ *         ...
+ *     })
+ *   and so on for dozens of element types.  This would mean that it would
+ *   retest that each and every one of those elements implements HTMLElement,
+ *   Element, and Node, which would be thousands of basically redundant tests.
+ *   The test suite therefore calls prevent_multiple_testing("HTMLElement").
+ *   This means that once one object has been tested to implement HTMLElement
+ *   and its ancestors, no other object will be.  Thus in the example code
+ *   above, the harness would test that document.documentElement correctly
+ *   implements HTMLHtmlElement, HTMLElement, Element, and Node; but
+ *   document.head would only be tested for HTMLHeadElement, and so on for
+ *   further objects.
+ *
+ * test():
+ *   Run all tests.  This should be called after you've called all other
+ *   methods to add IDLs and objects.
+ */
+
+/**
+ * Notes for people who want to edit this file (not just use it as a library):
+ *
+ * Most of the interesting stuff happens in the derived classes of IdlObject,
+ * especially IdlInterface.  The entry point for all IdlObjects is .test(),
+ * which is called by IdlArray.test().  An IdlObject is conceptually just
+ * "thing we want to run tests on", and an IdlArray is an array of IdlObjects
+ * with some additional data thrown in.
+ *
+ * The object model is based on what WebIDLParser.js produces, which is in turn
+ * based on its pegjs grammar.  If you want to figure out what properties an
+ * object will have from WebIDLParser.js, the best way is to look at the
+ * grammar:
+ *
+ *   https://github.com/darobin/webidl.js/blob/master/lib/grammar.peg
+ *
+ * So for instance:
+ *
+ *   // interface definition
+ *   interface
+ *       =   extAttrs:extendedAttributeList? S? "interface" S name:identifier w herit:ifInheritance? w "{" w mem:ifMember* w "}" w ";" w
+ *           { return { type: "interface", name: name, inheritance: herit, members: mem, extAttrs: extAttrs }; }
+ *
+ * This means that an "interface" object will have a .type property equal to
+ * the string "interface", a .name property equal to the identifier that the
+ * parser found, an .inheritance property equal to either null or the result of
+ * the "ifInheritance" production found elsewhere in the grammar, and so on.
+ * After each grammatical production is a JavaScript function in curly braces
+ * that gets called with suitable arguments and returns some JavaScript value.
+ *
+ * (Note that the version of WebIDLParser.js we use might sometimes be
+ * out-of-date or forked.)
+ *
+ * The members and methods of the classes defined by this file are all at least
+ * briefly documented, hopefully.
+ */
+(function(){
+"use strict";
+/// Helpers ///
+function constValue (cnt) {
+    if (cnt.type === "null") return null;
+    if (cnt.type === "NaN") return NaN;
+    if (cnt.type === "Infinity") return cnt.negative ? -Infinity : Infinity;
+    return cnt.value;
+}
+
+/// IdlArray ///
+// Entry point
+window.IdlArray = function()
+//@{
+{
+    /**
+     * A map from strings to the corresponding named IdlObject, such as
+     * IdlInterface or IdlException.  These are the things that test() will run
+     * tests on.
+     */
+    this.members = {};
+
+    /**
+     * A map from strings to arrays of strings.  The keys are interface or
+     * exception names, and are expected to also exist as keys in this.members
+     * (otherwise they'll be ignored).  This is populated by add_objects() --
+     * see documentation at the start of the file.  The actual tests will be
+     * run by calling this.members[name].test_object(obj) for each obj in
+     * this.objects[name].  obj is a string that will be eval'd to produce a
+     * JavaScript value, which is supposed to be an object implementing the
+     * given IdlObject (interface, exception, etc.).
+     */
+    this.objects = {};
+
+    /**
+     * When adding multiple collections of IDLs one at a time, an earlier one
+     * might contain a partial interface or implements statement that depends
+     * on a later one.  Save these up and handle them right before we run
+     * tests.
+     *
+     * .partials is simply an array of objects from WebIDLParser.js'
+     * "partialinterface" production.  .implements maps strings to arrays of
+     * strings, such that
+     *
+     *   A implements B;
+     *   A implements C;
+     *   D implements E;
+     *
+     * results in { A: ["B", "C"], D: ["E"] }.
+     */
+    this.partials = [];
+    this["implements"] = {};
+};
+
+//@}
+IdlArray.prototype.add_idls = function(raw_idls)
+//@{
+{
+    /** Entry point.  See documentation at beginning of file. */
+    this.internal_add_idls(WebIDL2.parse(raw_idls));
+};
+
+//@}
+IdlArray.prototype.add_untested_idls = function(raw_idls)
+//@{
+{
+    /** Entry point.  See documentation at beginning of file. */
+    var parsed_idls = WebIDL2.parse(raw_idls);
+    for (var i = 0; i < parsed_idls.length; i++)
+    {
+        parsed_idls[i].untested = true;
+        if ("members" in parsed_idls[i])
+        {
+            for (var j = 0; j < parsed_idls[i].members.length; j++)
+            {
+                parsed_idls[i].members[j].untested = true;
+            }
+        }
+    }
+    this.internal_add_idls(parsed_idls);
+};
+
+//@}
+IdlArray.prototype.internal_add_idls = function(parsed_idls)
+//@{
+{
+    /**
+     * Internal helper called by add_idls() and add_untested_idls().
+     * parsed_idls is an array of objects that come from WebIDLParser.js's
+     * "definitions" production.  The add_untested_idls() entry point
+     * additionally sets an .untested property on each object (and its
+     * .members) so that they'll be skipped by test() -- they'll only be
+     * used for base interfaces of tested interfaces, return types, etc.
+     */
+    parsed_idls.forEach(function(parsed_idl)
+    {
+        if (parsed_idl.type == "interface" && parsed_idl.partial)
+        {
+            this.partials.push(parsed_idl);
+            return;
+        }
+
+        if (parsed_idl.type == "implements")
+        {
+            if (!(parsed_idl.target in this["implements"]))
+            {
+                this["implements"][parsed_idl.target] = [];
+            }
+            this["implements"][parsed_idl.target].push(parsed_idl["implements"]);
+            return;
+        }
+
+        parsed_idl.array = this;
+        if (parsed_idl.name in this.members)
+        {
+            throw "Duplicate identifier " + parsed_idl.name;
+        }
+        switch(parsed_idl.type)
+        {
+        case "interface":
+            this.members[parsed_idl.name] = new IdlInterface(parsed_idl);
+            break;
+
+        case "exception":
+            this.members[parsed_idl.name] = new IdlException(parsed_idl);
+            break;
+
+        case "dictionary":
+            // Nothing to test, but we need the dictionary info around for type
+            // checks
+            this.members[parsed_idl.name] = new IdlDictionary(parsed_idl);
+            break;
+
+        case "typedef":
+            this.members[parsed_idl.name] = new IdlTypedef(parsed_idl);
+            break;
+
+        case "callback":
+            // TODO
+            console.log("callback not yet supported");
+            break;
+
+        case "enum":
+            this.members[parsed_idl.name] = new IdlEnum(parsed_idl);
+            break;
+
+        case "callback interface":
+            // TODO
+            console.log("callback interface not yet supported");
+            break;
+
+        default:
+            throw parsed_idl.name + ": " + parsed_idl.type + " not yet supported";
+        }
+    }.bind(this));
+};
+
+//@}
+IdlArray.prototype.add_objects = function(dict)
+//@{
+{
+    /** Entry point.  See documentation at beginning of file. */
+    for (var k in dict)
+    {
+        if (k in this.objects)
+        {
+            this.objects[k] = this.objects[k].concat(dict[k]);
+        }
+        else
+        {
+            this.objects[k] = dict[k];
+        }
+    }
+};
+
+//@}
+IdlArray.prototype.prevent_multiple_testing = function(name)
+//@{
+{
+    /** Entry point.  See documentation at beginning of file. */
+    this.members[name].prevent_multiple_testing = true;
+};
+
+//@}
+IdlArray.prototype.recursively_get_implements = function(interface_name)
+//@{
+{
+    /**
+     * Helper function for test().  Returns an array of things that implement
+     * interface_name, so if the IDL contains
+     *
+     *   A implements B;
+     *   B implements C;
+     *   B implements D;
+     *
+     * then recursively_get_implements("A") should return ["B", "C", "D"].
+     */
+    var ret = this["implements"][interface_name];
+    if (ret === undefined)
+    {
+        return [];
+    }
+    for (var i = 0; i < this["implements"][interface_name].length; i++)
+    {
+        ret = ret.concat(this.recursively_get_implements(ret[i]));
+        if (ret.indexOf(ret[i]) != ret.lastIndexOf(ret[i]))
+        {
+            throw "Circular implements statements involving " + ret[i];
+        }
+    }
+    return ret;
+};
+
+//@}
+IdlArray.prototype.test = function()
+//@{
+{
+    /** Entry point.  See documentation at beginning of file. */
+
+    // First merge in all the partial interfaces and implements statements we
+    // encountered.
+    this.partials.forEach(function(parsed_idl)
+    {
+        if (!(parsed_idl.name in this.members)
+        || !(this.members[parsed_idl.name] instanceof IdlInterface))
+        {
+            throw "Partial interface " + parsed_idl.name + " with no original interface";
+        }
+        if (parsed_idl.extAttrs)
+        {
+            parsed_idl.extAttrs.forEach(function(extAttr)
+            {
+                this.members[parsed_idl.name].extAttrs.push(extAttr);
+            }.bind(this));
+        }
+        parsed_idl.members.forEach(function(member)
+        {
+            this.members[parsed_idl.name].members.push(new IdlInterfaceMember(member));
+        }.bind(this));
+    }.bind(this));
+    this.partials = [];
+
+    for (var lhs in this["implements"])
+    {
+        this.recursively_get_implements(lhs).forEach(function(rhs)
+        {
+            var errStr = lhs + " implements " + rhs + ", but ";
+            if (!(lhs in this.members)) throw errStr + lhs + " is undefined.";
+            if (!(this.members[lhs] instanceof IdlInterface)) throw errStr + lhs + " is not an interface.";
+            if (!(rhs in this.members)) throw errStr + rhs + " is undefined.";
+            if (!(this.members[rhs] instanceof IdlInterface)) throw errStr + rhs + " is not an interface.";
+            this.members[rhs].members.forEach(function(member)
+            {
+                this.members[lhs].members.push(new IdlInterfaceMember(member));
+            }.bind(this));
+        }.bind(this));
+    }
+    this["implements"] = {};
+
+    // Now run test() on every member, and test_object() for every object.
+    for (var name in this.members)
+    {
+        this.members[name].test();
+        if (name in this.objects)
+        {
+            this.objects[name].forEach(function(str)
+            {
+                this.members[name].test_object(str);
+            }.bind(this));
+        }
+    }
+};
+
+//@}
+IdlArray.prototype.assert_type_is = function(value, type)
+//@{
+{
+    /**
+     * Helper function that tests that value is an instance of type according
+     * to the rules of WebIDL.  value is any JavaScript value, and type is an
+     * object produced by WebIDLParser.js' "type" production.  That production
+     * is fairly elaborate due to the complexity of WebIDL's types, so it's
+     * best to look at the grammar to figure out what properties it might have.
+     */
+    if (type.idlType == "any")
+    {
+        // No assertions to make
+        return;
+    }
+
+    if (type.nullable && value === null)
+    {
+        // This is fine
+        return;
+    }
+
+    if (type.array)
+    {
+        // TODO: not supported yet
+        return;
+    }
+
+    if (type.sequence)
+    {
+        assert_true(Array.isArray(value), "is not array");
+        if (!value.length)
+        {
+            // Nothing we can do.
+            return;
+        }
+        this.assert_type_is(value[0], type.idlType.idlType);
+        return;
+    }
+
+    type = type.idlType;
+
+    switch(type)
+    {
+        case "void":
+            assert_equals(value, undefined);
+            return;
+
+        case "boolean":
+            assert_equals(typeof value, "boolean");
+            return;
+
+        case "byte":
+            assert_equals(typeof value, "number");
+            assert_equals(value, Math.floor(value), "not an integer");
+            assert_true(-128 <= value && value <= 127, "byte " + value + " not in range [-128, 127]");
+            return;
+
+        case "octet":
+            assert_equals(typeof value, "number");
+            assert_equals(value, Math.floor(value), "not an integer");
+            assert_true(0 <= value && value <= 255, "octet " + value + " not in range [0, 255]");
+            return;
+
+        case "short":
+            assert_equals(typeof value, "number");
+            assert_equals(value, Math.floor(value), "not an integer");
+            assert_true(-32768 <= value && value <= 32767, "short " + value + " not in range [-32768, 32767]");
+            return;
+
+        case "unsigned short":
+            assert_equals(typeof value, "number");
+            assert_equals(value, Math.floor(value), "not an integer");
+            assert_true(0 <= value && value <= 65535, "unsigned short " + value + " not in range [0, 65535]");
+            return;
+
+        case "long":
+            assert_equals(typeof value, "number");
+            assert_equals(value, Math.floor(value), "not an integer");
+            assert_true(-2147483648 <= value && value <= 2147483647, "long " + value + " not in range [-2147483648, 2147483647]");
+            return;
+
+        case "unsigned long":
+            assert_equals(typeof value, "number");
+            assert_equals(value, Math.floor(value), "not an integer");
+            assert_true(0 <= value && value <= 4294967295, "unsigned long " + value + " not in range [0, 4294967295]");
+            return;
+
+        case "long long":
+            assert_equals(typeof value, "number");
+            return;
+
+        case "unsigned long long":
+            assert_equals(typeof value, "number");
+            assert_true(0 <= value, "unsigned long long is negative");
+            return;
+
+        case "float":
+        case "double":
+        case "unrestricted float":
+        case "unrestricted double":
+            // TODO: distinguish these cases
+            assert_equals(typeof value, "number");
+            return;
+
+        case "DOMString":
+            assert_equals(typeof value, "string");
+            return;
+
+        case "object":
+            assert_true(typeof value == "object" || typeof value == "function", "wrong type: not object or function");
+            return;
+    }
+
+    if (!(type in this.members))
+    {
+        throw "Unrecognized type " + type;
+    }
+
+    if (this.members[type] instanceof IdlInterface)
+    {
+        // We don't want to run the full
+        // IdlInterface.prototype.test_instance_of, because that could result
+        // in an infinite loop.  TODO: This means we don't have tests for
+        // NoInterfaceObject interfaces, and we also can't test objects that
+        // come from another window.
+        assert_true(typeof value == "object" || typeof value == "function", "wrong type: not object or function");
+        if (value instanceof Object
+        && !this.members[type].has_extended_attribute("NoInterfaceObject")
+        && type in window)
+        {
+            assert_true(value instanceof window[type], "not instanceof " + type);
+        }
+    }
+    else if (this.members[type] instanceof IdlEnum)
+    {
+        assert_equals(typeof value, "string");
+    }
+    else if (this.members[type] instanceof IdlDictionary)
+    {
+        // TODO: Test when we actually have something to test this on
+    }
+    else if (this.members[type] instanceof IdlTypedef)
+    {
+        // TODO: Test when we actually have something to test this on
+    }
+    else
+    {
+        throw "Type " + type + " isn't an interface or dictionary";
+    }
+};
+//@}
+
+/// IdlObject ///
+function IdlObject() {}
+IdlObject.prototype.test = function()
+//@{
+{
+    /**
+     * By default, this does nothing, so no actual tests are run for IdlObjects
+     * that don't define any (e.g., IdlDictionary at the time of this writing).
+     */
+};
+
+//@}
+IdlObject.prototype.has_extended_attribute = function(name)
+//@{
+{
+    /**
+     * This is only meaningful for things that support extended attributes,
+     * such as interfaces, exceptions, and members.
+     */
+    return this.extAttrs.some(function(o)
+    {
+        return o.name == name;
+    });
+};
+
+//@}
+
+/// IdlDictionary ///
+// Used for IdlArray.prototype.assert_type_is
+function IdlDictionary(obj)
+//@{
+{
+    /**
+     * obj is an object produced by the WebIDLParser.js "dictionary"
+     * production.
+     */
+
+    /** Self-explanatory. */
+    this.name = obj.name;
+
+    /** An array of objects produced by the "dictionaryMember" production. */
+    this.members = obj.members;
+
+    /**
+     * The name (as a string) of the dictionary type we inherit from, or null
+     * if there is none.
+     */
+    this.base = obj.inheritance;
+}
+
+//@}
+IdlDictionary.prototype = Object.create(IdlObject.prototype);
+
+/// IdlExceptionOrInterface ///
+// Code sharing!
+function IdlExceptionOrInterface(obj)
+//@{
+{
+    /**
+     * obj is an object produced by the WebIDLParser.js "exception" or
+     * "interface" production, as appropriate.
+     */
+
+    /** Self-explanatory. */
+    this.name = obj.name;
+
+    /** A back-reference to our IdlArray. */
+    this.array = obj.array;
+
+    /**
+     * An indicator of whether we should run tests on the (exception) interface
+     * object and (exception) interface prototype object.  Tests on members are
+     * controlled by .untested on each member, not this.
+     */
+    this.untested = obj.untested;
+
+    /** An array of objects produced by the "ExtAttr" production. */
+    this.extAttrs = obj.extAttrs;
+
+    /** An array of IdlInterfaceMembers. */
+    this.members = obj.members.map(function(m){return new IdlInterfaceMember(m); });
+
+    /**
+     * The name (as a string) of the type we inherit from, or null if there is
+     * none.
+     */
+    this.base = obj.inheritance;
+}
+ 
+//@}
+IdlExceptionOrInterface.prototype = Object.create(IdlObject.prototype);
+IdlExceptionOrInterface.prototype.test = function()
+//@{
+{
+    if (this.has_extended_attribute("NoInterfaceObject"))
+    {
+        // No tests to do without an instance.  TODO: We should still be able
+        // to run tests on the prototype object, if we obtain one through some
+        // other means.
+        return;
+    }
+
+    if (!this.untested)
+    {
+        // First test things to do with the exception/interface object and
+        // exception/interface prototype object.
+        this.test_self();
+    }
+    // Then test things to do with its members (constants, fields, attributes,
+    // operations, . . .).  These are run even if .untested is true, because
+    // members might themselves be marked as .untested.  This might happen to
+    // interfaces if the interface itself is untested but a partial interface
+    // that extends it is tested -- then the interface itself and its initial
+    // members will be marked as untested, but the members added by the partial
+    // interface are still tested.
+    this.test_members();
+};
+
+//@}
+
+/// IdlException ///
+function IdlException(obj) { IdlExceptionOrInterface.call(this, obj); }
+IdlException.prototype = Object.create(IdlExceptionOrInterface.prototype);
+IdlException.prototype.test_self = function()
+//@{
+{
+    test(function()
+    {
+        // "For every exception that is not declared with the
+        // [NoInterfaceObject] extended attribute, a corresponding property
+        // must exist on the exception’s relevant namespace object. The name of
+        // the property is the identifier of the exception, and its value is an
+        // object called the exception interface object, which provides access
+        // to any constants that have been associated with the exception. The
+        // property has the attributes { [[Writable]]: true, [[Enumerable]]:
+        // false, [[Configurable]]: true }."
+        assert_own_property(window, this.name,
+                            "window does not have own property " + format_value(this.name));
+        var desc = Object.getOwnPropertyDescriptor(window, this.name);
+        assert_false("get" in desc, "window's property " + format_value(this.name) + " has getter");
+        assert_false("set" in desc, "window's property " + format_value(this.name) + " has setter");
+        assert_true(desc.writable, "window's property " + format_value(this.name) + " is not writable");
+        assert_false(desc.enumerable, "window's property " + format_value(this.name) + " is enumerable");
+        assert_true(desc.configurable, "window's property " + format_value(this.name) + " is not configurable");
+
+        // "The exception interface object for a given exception must be a
+        // function object."
+        // "If an object is defined to be a function object, then it has
+        // characteristics as follows:"
+        // "Its [[Prototype]] internal property is the Function prototype
+        // object."
+        // Note: This doesn't match browsers as of December 2011, see
+        // http://www.w3.org/Bugs/Public/show_bug.cgi?id=14813
+        assert_equals(Object.getPrototypeOf(window[this.name]), Function.prototype,
+                      "prototype of window's property " + format_value(this.name) + " is not Function.prototype");
+        // "Its [[Get]] internal property is set as described in ECMA-262
+        // section 15.3.5.4."
+        // Not much to test for this.
+        // "Its [[Construct]] internal property is set as described in ECMA-262
+        // section 13.2.2."
+        // Tested below.
+        // "Its [[HasInstance]] internal property is set as described in
+        // ECMA-262 section 15.3.5.3, unless otherwise specified."
+        // TODO
+        // "Its [[Class]] internal property is “Function”."
+        // String() returns something implementation-dependent, because it
+        // calls Function#toString.
+        assert_class_string(window[this.name], "Function",
+                            "class string of " + this.name);
+
+        // TODO: Test 4.9.1.1. Exception interface object [[Call]] method
+        // (which does not match browsers:
+        // http://www.w3.org/Bugs/Public/show_bug.cgi?id=14885)
+    }.bind(this), this.name + " exception: existence and properties of exception interface object");
+
+    test(function()
+    {
+        assert_own_property(window, this.name,
+                            "window does not have own property " + format_value(this.name));
+
+        // "The exception interface object must also have a property named
+        // “prototype” with attributes { [[Writable]]: false, [[Enumerable]]:
+        // false, [[Configurable]]: false } whose value is an object called the
+        // exception interface prototype object. This object also provides
+        // access to the constants that are declared on the exception."
+        assert_own_property(window[this.name], "prototype",
+                            'exception "' + this.name + '" does not have own property "prototype"');
+        var desc = Object.getOwnPropertyDescriptor(window[this.name], "prototype");
+        assert_false("get" in desc, this.name + ".prototype has getter");
+        assert_false("set" in desc, this.name + ".prototype has setter");
+        assert_false(desc.writable, this.name + ".prototype is writable");
+        assert_false(desc.enumerable, this.name + ".prototype is enumerable");
+        assert_false(desc.configurable, this.name + ".prototype is configurable");
+
+        // "The exception interface prototype object for a given exception must
+        // have an internal [[Prototype]] property whose value is as follows:
+        //
+        // "If the exception is declared to inherit from another exception,
+        // then the value of the internal [[Prototype]] property is the
+        // exception interface prototype object for the inherited exception.
+        // "Otherwise, the exception is not declared to inherit from another
+        // exception. The value of the internal [[Prototype]] property is the
+        // Error prototype object ([ECMA-262], section 15.11.3.1)."
+        //
+        // Note: This doesn't match browsers as of December 2011, see
+        // https://www.w3.org/Bugs/Public/show_bug.cgi?id=14887.
+        var inherit_exception = this.base ? this.base : "Error";
+        assert_own_property(window, inherit_exception,
+                            'should inherit from ' + inherit_exception + ', but window has no such property');
+        assert_own_property(window[inherit_exception], "prototype",
+                            'should inherit from ' + inherit_exception + ', but that object has no "prototype" property');
+        assert_equals(Object.getPrototypeOf(window[this.name].prototype),
+                      window[inherit_exception].prototype,
+                      'prototype of ' + this.name + '.prototype is not ' + inherit_exception + '.prototype');
+
+        // "The class string of an exception interface prototype object is the
+        // concatenation of the exception’s identifier and the string
+        // “Prototype”."
+        assert_class_string(window[this.name].prototype, this.name + "Prototype",
+                            "class string of " + this.name + ".prototype");
+        // TODO: Test String(), based on ES definition of
+        // Error.prototype.toString?
+    }.bind(this), this.name + " exception: existence and properties of exception interface prototype object");
+
+    test(function()
+    {
+        assert_own_property(window, this.name,
+                            "window does not have own property " + format_value(this.name));
+        assert_own_property(window[this.name], "prototype",
+                            'interface "' + this.name + '" does not have own property "prototype"');
+
+        // "There must be a property named “name” on the exception interface
+        // prototype object with attributes { [[Writable]]: true,
+        // [[Enumerable]]: false, [[Configurable]]: true } and whose value is
+        // the identifier of the exception."
+        assert_own_property(window[this.name].prototype, "name",
+                'prototype object does not have own property "name"');
+        var desc = Object.getOwnPropertyDescriptor(window[this.name].prototype, "name");
+        assert_false("get" in desc, this.name + ".prototype.name has getter");
+        assert_false("set" in desc, this.name + ".prototype.name has setter");
+        assert_true(desc.writable, this.name + ".prototype.name is not writable");
+        assert_false(desc.enumerable, this.name + ".prototype.name is enumerable");
+        assert_true(desc.configurable, this.name + ".prototype.name is not configurable");
+        assert_equals(desc.value, this.name, this.name + ".prototype.name has incorrect value");
+    }.bind(this), this.name + " exception: existence and properties of exception interface prototype object's \"name\" property");
+
+    test(function()
+    {
+        assert_own_property(window, this.name,
+                            "window does not have own property " + format_value(this.name));
+        assert_own_property(window[this.name], "prototype",
+                            'interface "' + this.name + '" does not have own property "prototype"');
+
+        // "If the [NoInterfaceObject] extended attribute was not specified on
+        // the exception, then there must also be a property named
+        // “constructor” on the exception interface prototype object with
+        // attributes { [[Writable]]: true, [[Enumerable]]: false,
+        // [[Configurable]]: true } and whose value is a reference to the
+        // exception interface object for the exception."
+        assert_own_property(window[this.name].prototype, "constructor",
+                            this.name + '.prototype does not have own property "constructor"');
+        var desc = Object.getOwnPropertyDescriptor(window[this.name].prototype, "constructor");
+        assert_false("get" in desc, this.name + ".prototype.constructor has getter");
+        assert_false("set" in desc, this.name + ".prototype.constructor has setter");
+        assert_true(desc.writable, this.name + ".prototype.constructor is not writable");
+        assert_false(desc.enumerable, this.name + ".prototype.constructor is enumerable");
+        assert_true(desc.configurable, this.name + ".prototype.constructor in not configurable");
+        assert_equals(window[this.name].prototype.constructor, window[this.name],
+                      this.name + '.prototype.constructor is not the same object as ' + this.name);
+    }.bind(this), this.name + " exception: existence and properties of exception interface prototype object's \"constructor\" property");
+};
+
+//@}
+IdlException.prototype.test_members = function()
+//@{
+{
+    for (var i = 0; i < this.members.length; i++)
+    {
+        var member = this.members[i];
+        if (member.untested)
+        {
+            continue;
+        }
+        if (member.type == "const" && member.name != "prototype")
+        {
+            test(function()
+            {
+                assert_own_property(window, this.name,
+                                    "window does not have own property " + format_value(this.name));
+
+                // "For each constant defined on the exception, there must be a
+                // corresponding property on the exception interface object, if
+                // it exists, if the identifier of the constant is not
+                // “prototype”."
+                assert_own_property(window[this.name], member.name);
+                // "The value of the property is the ECMAScript value that is
+                // equivalent to the constant’s IDL value, according to the
+                // rules in section 4.2 above."
+                assert_equals(window[this.name][member.name], constValue(member.value),
+                              "property has wrong value");
+                // "The property has attributes { [[Writable]]: false,
+                // [[Enumerable]]: true, [[Configurable]]: false }."
+                var desc = Object.getOwnPropertyDescriptor(window[this.name], member.name);
+                assert_false("get" in desc, "property has getter");
+                assert_false("set" in desc, "property has setter");
+                assert_false(desc.writable, "property is writable");
+                assert_true(desc.enumerable, "property is not enumerable");
+                assert_false(desc.configurable, "property is configurable");
+            }.bind(this), this.name + " exception: constant " + member.name + " on exception interface object");
+            // "In addition, a property with the same characteristics must
+            // exist on the exception interface prototype object."
+            test(function()
+            {
+                assert_own_property(window, this.name,
+                                    "window does not have own property " + format_value(this.name));
+                assert_own_property(window[this.name], "prototype",
+                                    'exception "' + this.name + '" does not have own property "prototype"');
+
+                assert_own_property(window[this.name].prototype, member.name);
+                assert_equals(window[this.name].prototype[member.name], constValue(member.value),
+                              "property has wrong value");
+                var desc = Object.getOwnPropertyDescriptor(window[this.name].prototype, member.name);
+                assert_false("get" in desc, "property has getter");
+                assert_false("set" in desc, "property has setter");
+                assert_false(desc.writable, "property is writable");
+                assert_true(desc.enumerable, "property is not enumerable");
+                assert_false(desc.configurable, "property is configurable");
+            }.bind(this), this.name + " exception: constant " + member.name + " on exception interface prototype object");
+        }
+        else if (member.type == "field")
+        {
+            test(function()
+            {
+                assert_own_property(window, this.name,
+                                    "window does not have own property " + format_value(this.name));
+                assert_own_property(window[this.name], "prototype",
+                                    'exception "' + this.name + '" does not have own property "prototype"');
+
+                // "For each exception field, there must be a corresponding
+                // property on the exception interface prototype object, whose
+                // characteristics are as follows:
+                // "The name of the property is the identifier of the exception
+                // field."
+                assert_own_property(window[this.name].prototype, member.name);
+                // "The property has attributes { [[Get]]: G, [[Enumerable]]:
+                // true, [[Configurable]]: true }, where G is the exception
+                // field getter, defined below."
+                var desc = Object.getOwnPropertyDescriptor(window[this.name].prototype, member.name);
+                assert_false("value" in desc, "property descriptor has value but is supposed to be accessor");
+                assert_false("writable" in desc, 'property descriptor has "writable" field but is supposed to be accessor');
+                // TODO: ES5 doesn't seem to say whether desc should have a
+                // .set property.
+                assert_true(desc.enumerable, "property is not enumerable");
+                assert_true(desc.configurable, "property is not configurable");
+                // "The exception field getter is a Function object whose
+                // behavior when invoked is as follows:"
+                assert_equals(typeof desc.get, "function", "typeof getter");
+                // "The value of the Function object’s “length” property is the
+                // Number value 0."
+                // This test is before the TypeError tests so that it's easiest
+                // to see that Firefox 11a1 only fails one assert in this test.
+                assert_equals(desc.get.length, 0, "getter length");
+                // "Let O be the result of calling ToObject on the this value.
+                // "If O is not a platform object representing an exception for
+                // the exception on which the exception field was declared,
+                // then throw a TypeError."
+                // TODO: Test on a platform object representing an exception.
+                assert_throws(new TypeError(), function()
+                {
+                    window[this.name].prototype[member.name];
+                }.bind(this), "getting property on prototype object must throw TypeError");
+                assert_throws(new TypeError(), function()
+                {
+                    desc.get.call({});
+                }.bind(this), "calling getter on wrong object type must throw TypeError");
+            }.bind(this), this.name + " exception: field " + member.name + " on exception interface prototype object");
+        }
+    }
+};
+
+//@}
+IdlException.prototype.test_object = function(desc)
+//@{
+{
+    var obj, exception = null;
+    try
+    {
+        obj = eval(desc);
+    }
+    catch(e)
+    {
+        exception = e;
+    }
+
+    test(function()
+    {
+        assert_equals(exception, null, "Unexpected exception when evaluating object");
+        assert_equals(typeof obj, "object", "wrong typeof object");
+
+        // We can't easily test that its prototype is correct if there's no
+        // interface object, or the object is from a different global
+        // environment (not instanceof Object).  TODO: test in this case that
+        // its prototype at least looks correct, even if we can't test that
+        // it's actually correct.
+        if (!this.has_extended_attribute("NoInterfaceObject")
+        && (typeof obj != "object" || obj instanceof Object))
+        {
+            assert_own_property(window, this.name,
+                                "window does not have own property " + format_value(this.name));
+            assert_own_property(window[this.name], "prototype",
+                                'exception "' + this.name + '" does not have own property "prototype"');
+
+            // "The value of the internal [[Prototype]] property of the
+            // exception object must be the exception interface prototype
+            // object from the global environment the exception object is
+            // associated with."
+            assert_equals(Object.getPrototypeOf(obj),
+                          window[this.name].prototype,
+                          desc + "'s prototype is not " + this.name + ".prototype");
+        }
+
+        // "The class string of the exception object must be the identifier of
+        // the exception."
+        assert_class_string(obj, this.name, "class string of " + desc);
+        // Stringifier is not defined for DOMExceptions, because message isn't
+        // defined.
+    }.bind(this), this.name + " must be represented by " + desc);
+
+    for (var i = 0; i < this.members.length; i++)
+    {
+        var member = this.members[i];
+        test(function()
+        {
+            assert_equals(exception, null, "Unexpected exception when evaluating object");
+            assert_equals(typeof obj, "object", "wrong typeof object");
+            assert_inherits(obj, member.name);
+            if (member.type == "const")
+            {
+                assert_equals(obj[member.name], constValue(member.value));
+            }
+            if (member.type == "field")
+            {
+                this.array.assert_type_is(obj[member.name], member.idlType);
+            }
+        }.bind(this), this.name + " exception: " + desc + ' must inherit property "' + member.name + '" with the proper type');
+    }
+};
+//@}
+
+/// IdlInterface ///
+function IdlInterface(obj) { IdlExceptionOrInterface.call(this, obj); }
+IdlInterface.prototype = Object.create(IdlExceptionOrInterface.prototype);
+IdlInterface.prototype.is_callback = function()
+//@{
+{
+    return this.has_extended_attribute("Callback");
+};
+//@}
+
+IdlInterface.prototype.has_constants = function()
+//@{
+{
+    return this.members.some(function(member) {
+        return member.type === "const";
+    });
+};
+//@}
+
+IdlInterface.prototype.test_self = function()
+//@{
+{
+    test(function()
+    {
+        // This function tests WebIDL as of 2012-11-28.
+
+        // "For every interface that:
+        // * is a callback interface that has constants declared on it, or
+        // * is a non-callback interface that is not declared with the
+        //   [NoInterfaceObject] extended attribute,
+        // a corresponding property MUST exist on the ECMAScript global object.
+        // The name of the property is the identifier of the interface, and its
+        // value is an object called the interface object.
+        // The property has the attributes { [[Writable]]: true,
+        // [[Enumerable]]: false, [[Configurable]]: true }."
+        if (this.is_callback() && !this.has_constants()) {
+            return;
+        }
+
+        // TODO: Should we test here that the property is actually writable
+        // etc., or trust getOwnPropertyDescriptor?
+        assert_own_property(window, this.name,
+                            "window does not have own property " + format_value(this.name));
+        var desc = Object.getOwnPropertyDescriptor(window, this.name);
+        assert_false("get" in desc, "window's property " + format_value(this.name) + " has getter");
+        assert_false("set" in desc, "window's property " + format_value(this.name) + " has setter");
+        assert_true(desc.writable, "window's property " + format_value(this.name) + " is not writable");
+        assert_false(desc.enumerable, "window's property " + format_value(this.name) + " is enumerable");
+        assert_true(desc.configurable, "window's property " + format_value(this.name) + " is not configurable");
+
+        if (this.is_callback()) {
+            // "The internal [[Prototype]] property of an interface object for
+            // a callback interface MUST be the Object.prototype object."
+            assert_equals(Object.getPrototypeOf(window[this.name]), Object.prototype,
+                          "prototype of window's property " + format_value(this.name) + " is not Object.prototype");
+
+            return;
+        }
+
+        // "The interface object for a given non-callback interface is a
+        // function object."
+        // "If an object is defined to be a function object, then it has
+        // characteristics as follows:"
+
+        // "* Its [[Prototype]] internal property is the Function prototype
+        //    object."
+        assert_equals(Object.getPrototypeOf(window[this.name]), Function.prototype,
+                      "prototype of window's property " + format_value(this.name) + " is not Function.prototype");
+
+        // "* Its [[Get]] internal property is set as described in ECMA-262
+        //    section 15.3.5.4."
+        // Not much to test for this.
+
+        // "* Its [[Construct]] internal property is set as described in
+        //    ECMA-262 section 13.2.2."
+        // Tested below if no constructor is defined.  TODO: test constructors
+        // if defined.
+
+        // "* Its [[HasInstance]] internal property is set as described in
+        //    ECMA-262 section 15.3.5.3, unless otherwise specified."
+        // TODO
+
+        // "* Its [[NativeBrand]] internal property is “Function”."
+        // String() returns something implementation-dependent, because it calls
+        // Function#toString.
+        assert_class_string(window[this.name], "Function", "class string of " + this.name);
+
+        if (!this.has_extended_attribute("Constructor")) {
+            // "The internal [[Call]] method of the interface object behaves as
+            // follows . . .
+            //
+            // "If I was not declared with a [Constructor] extended attribute,
+            // then throw a TypeError."
+            assert_throws(new TypeError(), function() {
+                window[this.name]();
+            }.bind(this), "interface object didn't throw TypeError when called as a function");
+            assert_throws(new TypeError(), function() {
+                new window[this.name]();
+            }.bind(this), "interface object didn't throw TypeError when called as a constructor");
+        }
+    }.bind(this), this.name + " interface: existence and properties of interface object");
+
+    if (!this.is_callback()) {
+        test(function() {
+            // This function tests WebIDL as of 2013-08-25.
+            // http://dev.w3.org/2006/webapi/WebIDL/#es-interface-call
+
+            assert_own_property(window, this.name,
+                                "window does not have own property " + format_value(this.name));
+
+            // "Interface objects for non-callback interfaces MUST have a
+            // property named “length” with attributes { [[Writable]]: false,
+            // [[Enumerable]]: false, [[Configurable]]: false } whose value is
+            // a Number."
+            assert_own_property(window[this.name], "length");
+            var desc = Object.getOwnPropertyDescriptor(window[this.name], "length");
+            assert_false("get" in desc, this.name + ".length has getter");
+            assert_false("set" in desc, this.name + ".length has setter");
+            assert_false(desc.writable, this.name + ".length is writable");
+            assert_false(desc.enumerable, this.name + ".length is enumerable");
+            assert_false(desc.configurable, this.name + ".length is configurable");
+
+            var constructors = this.extAttrs
+                .filter(function(attr) { return attr.name == "Constructor"; });
+            var expected_length;
+            if (!constructors.length) {
+                // "If the [Constructor] extended attribute, does not appear on
+                // the interface definition, then the value is 0."
+                expected_length = 0;
+            } else {
+                // "Otherwise, the value is determined as follows: . . .
+                // "Return the length of the shortest argument list of the
+                // entries in S."
+                expected_length = constructors.map(function(attr) {
+                    return attr.arguments ? attr.arguments.filter(function(arg) {
+                        return !arg.optional;
+                    }).length : 0;
+                })
+                .reduce(function(m, n) { return Math.min(m, n); });
+            }
+            assert_equals(window[this.name].length, expected_length, "wrong value for " + this.name + ".length");
+        }.bind(this), this.name + " interface object length");
+    }
+
+    // TODO: Test named constructors if I find any interfaces that have them.
+
+    test(function()
+    {
+        assert_own_property(window, this.name,
+                            "window does not have own property " + format_value(this.name));
+
+        if (this.has_extended_attribute("Callback")) {
+            assert_false("prototype" in window[this.name],
+                         this.name + ' should not have a "prototype" property');
+            return;
+        }
+
+        // "The interface object must also have a property named “prototype”
+        // with attributes { [[Writable]]: false, [[Enumerable]]: false,
+        // [[Configurable]]: false } whose value is an object called the
+        // interface prototype object. This object has properties that
+        // correspond to the attributes and operations defined on the
+        // interface, and is described in more detail in section 4.5.3 below."
+        assert_own_property(window[this.name], "prototype",
+                            'interface "' + this.name + '" does not have own property "prototype"');
+        var desc = Object.getOwnPropertyDescriptor(window[this.name], "prototype");
+        assert_false("get" in desc, this.name + ".prototype has getter");
+        assert_false("set" in desc, this.name + ".prototype has setter");
+        assert_false(desc.writable, this.name + ".prototype is writable");
+        assert_false(desc.enumerable, this.name + ".prototype is enumerable");
+        assert_false(desc.configurable, this.name + ".prototype is configurable");
+
+        // Next, test that the [[Prototype]] of the interface prototype object
+        // is correct. (This is made somewhat difficult by the existence of
+        // [NoInterfaceObject].)
+        // TODO: Aryeh thinks there's at least other place in this file where
+        //       we try to figure out if an interface prototype object is
+        //       correct. Consolidate that code.
+
+        // "The interface prototype object for a given interface A must have an
+        // internal [[Prototype]] property whose value is as follows:
+        // "If A is not declared to inherit from another interface, then the
+        // value of the internal [[Prototype]] property of A is the Array
+        // prototype object ([ECMA-262], section 15.4.4) if the interface was
+        // declared with ArrayClass, or the Object prototype object otherwise
+        // ([ECMA-262], section 15.2.4).
+        // "Otherwise, A does inherit from another interface. The value of the
+        // internal [[Prototype]] property of A is the interface prototype
+        // object for the inherited interface."
+        var inherit_interface, inherit_interface_has_interface_object;
+        if (this.base) {
+            inherit_interface = this.base;
+            inherit_interface_has_interface_object =
+                !this.array
+                     .members[inherit_interface]
+                     .has_extended_attribute("NoInterfaceObject");
+        } else if (this.has_extended_attribute('ArrayClass')) {
+            inherit_interface = 'Array';
+            inherit_interface_has_interface_object = true;
+        } else {
+            inherit_interface = 'Object';
+            inherit_interface_has_interface_object = true;
+        }
+        if (inherit_interface_has_interface_object) {
+            assert_own_property(window, inherit_interface,
+                                'should inherit from ' + inherit_interface + ', but window has no such property');
+            assert_own_property(window[inherit_interface], 'prototype',
+                                'should inherit from ' + inherit_interface + ', but that object has no "prototype" property');
+            assert_equals(Object.getPrototypeOf(window[this.name].prototype),
+                          window[inherit_interface].prototype,
+                          'prototype of ' + this.name + '.prototype is not ' + inherit_interface + '.prototype');
+        } else {
+            // We can't test that we get the correct object, because this is the
+            // only way to get our hands on it. We only test that its class
+            // string, at least, is correct.
+            assert_class_string(Object.getPrototypeOf(window[this.name].prototype),
+                                inherit_interface + 'Prototype',
+                                'Class name for prototype of ' + this.name +
+                                '.prototype is not "' + inherit_interface + 'Prototype"');
+        }
+
+        // "The class string of an interface prototype object is the
+        // concatenation of the interface’s identifier and the string
+        // “Prototype”."
+        assert_class_string(window[this.name].prototype, this.name + "Prototype",
+                            "class string of " + this.name + ".prototype");
+        // String() should end up calling {}.toString if nothing defines a
+        // stringifier.
+        if (!this.has_stringifier()) {
+            assert_equals(String(window[this.name].prototype), "[object " + this.name + "Prototype]",
+                    "String(" + this.name + ".prototype)");
+        }
+    }.bind(this), this.name + " interface: existence and properties of interface prototype object");
+
+    test(function()
+    {
+        assert_own_property(window, this.name,
+                            "window does not have own property " + format_value(this.name));
+
+        if (this.has_extended_attribute("Callback")) {
+            assert_false("prototype" in window[this.name],
+                         this.name + ' should not have a "prototype" property');
+            return;
+        }
+
+        assert_own_property(window[this.name], "prototype",
+                            'interface "' + this.name + '" does not have own property "prototype"');
+
+        // "If the [NoInterfaceObject] extended attribute was not specified on
+        // the interface, then the interface prototype object must also have a
+        // property named “constructor” with attributes { [[Writable]]: true,
+        // [[Enumerable]]: false, [[Configurable]]: true } whose value is a
+        // reference to the interface object for the interface."
+        assert_own_property(window[this.name].prototype, "constructor",
+                            this.name + '.prototype does not have own property "constructor"');
+        var desc = Object.getOwnPropertyDescriptor(window[this.name].prototype, "constructor");
+        assert_false("get" in desc, this.name + ".prototype.constructor has getter");
+        assert_false("set" in desc, this.name + ".prototype.constructor has setter");
+        assert_true(desc.writable, this.name + ".prototype.constructor is not writable");
+        assert_false(desc.enumerable, this.name + ".prototype.constructor is enumerable");
+        assert_true(desc.configurable, this.name + ".prototype.constructor in not configurable");
+        assert_equals(window[this.name].prototype.constructor, window[this.name],
+                      this.name + '.prototype.constructor is not the same object as ' + this.name);
+    }.bind(this), this.name + ' interface: existence and properties of interface prototype object\'s "constructor" property');
+};
+
+//@}
+IdlInterface.prototype.test_members = function()
+//@{
+{
+    for (var i = 0; i < this.members.length; i++)
+    {
+        var member = this.members[i];
+        if (member.untested)
+        {
+            continue;
+        }
+        if (member.type == "const")
+        {
+            test(function()
+            {
+                assert_own_property(window, this.name,
+                                    "window does not have own property " + format_value(this.name));
+
+                // "For each constant defined on an interface A, there must be
+                // a corresponding property on the interface object, if it
+                // exists."
+                assert_own_property(window[this.name], member.name);
+                // "The value of the property is that which is obtained by
+                // converting the constant’s IDL value to an ECMAScript
+                // value."
+                assert_equals(window[this.name][member.name], constValue(member.value),
+                              "property has wrong value");
+                // "The property has attributes { [[Writable]]: false,
+                // [[Enumerable]]: true, [[Configurable]]: false }."
+                var desc = Object.getOwnPropertyDescriptor(window[this.name], member.name);
+                assert_false("get" in desc, "property has getter");
+                assert_false("set" in desc, "property has setter");
+                assert_false(desc.writable, "property is writable");
+                assert_true(desc.enumerable, "property is not enumerable");
+                assert_false(desc.configurable, "property is configurable");
+            }.bind(this), this.name + " interface: constant " + member.name + " on interface object");
+            // "In addition, a property with the same characteristics must
+            // exist on the interface prototype object."
+            test(function()
+            {
+                assert_own_property(window, this.name,
+                                    "window does not have own property " + format_value(this.name));
+
+                if (this.has_extended_attribute("Callback")) {
+                    assert_false("prototype" in window[this.name],
+                                 this.name + ' should not have a "prototype" property');
+                    return;
+                }
+
+                assert_own_property(window[this.name], "prototype",
+                                    'interface "' + this.name + '" does not have own property "prototype"');
+
+                assert_own_property(window[this.name].prototype, member.name);
+                assert_equals(window[this.name].prototype[member.name], constValue(member.value),
+                              "property has wrong value");
+                var desc = Object.getOwnPropertyDescriptor(window[this.name], member.name);
+                assert_false("get" in desc, "property has getter");
+                assert_false("set" in desc, "property has setter");
+                assert_false(desc.writable, "property is writable");
+                assert_true(desc.enumerable, "property is not enumerable");
+                assert_false(desc.configurable, "property is configurable");
+            }.bind(this), this.name + " interface: constant " + member.name + " on interface prototype object");
+        }
+        else if (member.type == "attribute")
+        {
+            if (member.has_extended_attribute("Unforgeable"))
+            {
+                // We do the checks in test_interface_of instead
+                continue;
+            }
+            test(function()
+            {
+                assert_own_property(window, this.name,
+                                    "window does not have own property " + format_value(this.name));
+                assert_own_property(window[this.name], "prototype",
+                                    'interface "' + this.name + '" does not have own property "prototype"');
+
+                if (member["static"]) {
+                    assert_own_property(window[this.name], member.name,
+                        "The interface object must have a property " +
+                        format_value(member.name));
+                }
+                else
+                {
+                    assert_true(member.name in window[this.name].prototype,
+                        "The prototype object must have a property " +
+                        format_value(member.name));
+
+                    // TODO: Needs to test for LenientThis.
+                    assert_throws(new TypeError(), function() {
+                        window[this.name].prototype[member.name];
+                    }.bind(this), "getting property on prototype object must throw TypeError");
+                    do_interface_attribute_asserts(window[this.name].prototype, member);
+                }
+            }.bind(this), this.name + " interface: attribute " + member.name);
+        }
+        else if (member.type == "operation")
+        {
+            // TODO: Need to correctly handle multiple operations with the same
+            // identifier.
+            if (!member.name)
+            {
+                // Unnamed getter or such
+                continue;
+            }
+            test(function()
+            {
+                assert_own_property(window, this.name,
+                                    "window does not have own property " + format_value(this.name));
+
+                if (this.has_extended_attribute("Callback")) {
+                    assert_false("prototype" in window[this.name],
+                                 this.name + ' should not have a "prototype" property');
+                    return;
+                }
+
+                assert_own_property(window[this.name], "prototype",
+                                    'interface "' + this.name + '" does not have own property "prototype"');
+
+                // "For each unique identifier of an operation defined on the
+                // interface, there must be a corresponding property on the
+                // interface prototype object (if it is a regular operation) or
+                // the interface object (if it is a static operation), unless
+                // the effective overload set for that identifier and operation
+                // and with an argument count of 0 (for the ECMAScript language
+                // binding) has no entries."
+                //
+                var prototypeOrInterfaceObject;
+                if (member["static"]) {
+                    assert_own_property(window[this.name], member.name,
+                            "interface prototype object missing static operation");
+                    prototypeOrInterfaceObject = window[this.name];
+                }
+                else
+                {
+                    assert_own_property(window[this.name].prototype, member.name,
+                            "interface prototype object missing non-static operation");
+                    prototypeOrInterfaceObject = window[this.name].prototype;
+                }
+
+                var desc = Object.getOwnPropertyDescriptor(prototypeOrInterfaceObject, member.name);
+                // "The property has attributes { [[Writable]]: true,
+                // [[Enumerable]]: true, [[Configurable]]: true }."
+                assert_false("get" in desc, "property has getter");
+                assert_false("set" in desc, "property has setter");
+                assert_true(desc.writable, "property is not writable");
+                assert_true(desc.enumerable, "property is not enumerable");
+                assert_true(desc.configurable, "property is not configurable");
+                // "The value of the property is a Function object whose
+                // behavior is as follows . . ."
+                assert_equals(typeof prototypeOrInterfaceObject[member.name], "function",
+                              "property must be a function");
+                // "The value of the Function object’s “length” property is
+                // a Number determined as follows:
+                // ". . .
+                // "Return the length of the shortest argument list of the
+                // entries in S."
+                //
+                // TODO: Doesn't handle overloading or variadic arguments.
+                assert_equals(prototypeOrInterfaceObject[member.name].length,
+                    member.arguments.filter(function(arg) {
+                        return !arg.optional;
+                    }).length,
+                    "property has wrong .length");
+
+                // Make some suitable arguments
+                var args = member.arguments.map(function(arg) {
+                    return create_suitable_object(arg.idlType);
+                });
+
+                // "Let O be a value determined as follows:
+                // ". . .
+                // "Otherwise, throw a TypeError."
+                // This should be hit if the operation is not static, there is
+                // no [ImplicitThis] attribute, and the this value is null.
+                //
+                // TODO: We currently ignore the [ImplicitThis] case.
+                if (!member["static"]) {
+                    assert_throws(new TypeError(), function() {
+                        window[this.name].prototype[member.name].apply(null, args);
+                    }, "calling operation with this = null didn't throw TypeError");
+                }
+
+                // ". . . If O is not null and is also not a platform object
+                // that implements interface I, throw a TypeError."
+                //
+                // TODO: Test a platform object that implements some other
+                // interface.  (Have to be sure to get inheritance right.)
+                assert_throws(new TypeError(), function() {
+                    window[this.name].prototype[member.name].apply({}, args);
+                }, "calling operation with this = {} didn't throw TypeError");
+            }.bind(this), this.name + " interface: operation " + member.name +
+            "(" + member.arguments.map(function(m) { return m.idlType.idlType; }) +
+            ")");
+        }
+        // TODO: check more member types, like stringifier
+    }
+};
+
+//@}
+IdlInterface.prototype.test_object = function(desc)
+//@{
+{
+    var obj, exception = null;
+    try
+    {
+        obj = eval(desc);
+    }
+    catch(e)
+    {
+        exception = e;
+    }
+
+    // TODO: WebIDLParser doesn't currently support named legacycallers, so I'm
+    // not sure what those would look like in the AST
+    var expected_typeof = this.members.some(function(member)
+    {
+        return member.legacycaller
+            || ("idlType" in member && member.idlType.legacycaller)
+            || ("idlType" in member && typeof member.idlType == "object"
+            && "idlType" in member.idlType && member.idlType.idlType == "legacycaller");
+    }) ? "function" : "object";
+
+    this.test_primary_interface_of(desc, obj, exception, expected_typeof);
+    var current_interface = this;
+    while (current_interface)
+    {
+        if (!(current_interface.name in this.array.members))
+        {
+            throw "Interface " + current_interface.name + " not found (inherited by " + this.name + ")";
+        }
+        if (current_interface.prevent_multiple_testing && current_interface.already_tested)
+        {
+            return;
+        }
+        current_interface.test_interface_of(desc, obj, exception, expected_typeof);
+        current_interface = this.array.members[current_interface.base];
+    }
+};
+
+//@}
+IdlInterface.prototype.test_primary_interface_of = function(desc, obj, exception, expected_typeof)
+//@{
+{
+    // We can't easily test that its prototype is correct if there's no
+    // interface object, or the object is from a different global environment
+    // (not instanceof Object).  TODO: test in this case that its prototype at
+    // least looks correct, even if we can't test that it's actually correct.
+    if (!this.has_extended_attribute("NoInterfaceObject")
+    && (typeof obj != expected_typeof || obj instanceof Object))
+    {
+        test(function()
+        {
+            assert_equals(exception, null, "Unexpected exception when evaluating object");
+            assert_equals(typeof obj, expected_typeof, "wrong typeof object");
+            assert_own_property(window, this.name,
+                                "window does not have own property " + format_value(this.name));
+            assert_own_property(window[this.name], "prototype",
+                                'interface "' + this.name + '" does not have own property "prototype"');
+
+            // "The value of the internal [[Prototype]] property of the
+            // platform object is the interface prototype object of the primary
+            // interface from the platform object’s associated global
+            // environment."
+            assert_equals(Object.getPrototypeOf(obj),
+                          window[this.name].prototype,
+                          desc + "'s prototype is not " + this.name + ".prototype");
+        }.bind(this), this.name + " must be primary interface of " + desc);
+    }
+
+    // "The class string of a platform object that implements one or more
+    // interfaces must be the identifier of the primary interface of the
+    // platform object."
+    test(function()
+    {
+        assert_equals(exception, null, "Unexpected exception when evaluating object");
+        assert_equals(typeof obj, expected_typeof, "wrong typeof object");
+        assert_class_string(obj, this.name, "class string of " + desc);
+        if (!this.has_stringifier())
+        {
+            assert_equals(String(obj), "[object " + this.name + "]", "String(" + desc + ")");
+        }
+    }.bind(this), "Stringification of " + desc);
+};
+
+//@}
+IdlInterface.prototype.test_interface_of = function(desc, obj, exception, expected_typeof)
+//@{
+{
+    // TODO: Indexed and named properties, more checks on interface members
+    this.already_tested = true;
+
+    for (var i = 0; i < this.members.length; i++)
+    {
+        var member = this.members[i];
+        if (member.has_extended_attribute("Unforgeable"))
+        {
+            test(function()
+            {
+                assert_equals(exception, null, "Unexpected exception when evaluating object");
+                assert_equals(typeof obj, expected_typeof, "wrong typeof object");
+                do_interface_attribute_asserts(obj, member);
+            }.bind(this), this.name + " interface: " + desc + ' must have own property "' + member.name + '"');
+        }
+        else if ((member.type == "const"
+        || member.type == "attribute"
+        || member.type == "operation")
+        && member.name)
+        {
+            test(function()
+            {
+                assert_equals(exception, null, "Unexpected exception when evaluating object");
+                assert_equals(typeof obj, expected_typeof, "wrong typeof object");
+                if (!member["static"]) {
+                    assert_inherits(obj, member.name);
+                    if (member.type == "const")
+                    {
+                        assert_equals(obj[member.name], constValue(member.value));
+                    }
+                    if (member.type == "attribute")
+                    {
+                        // Attributes are accessor properties, so they might
+                        // legitimately throw an exception rather than returning
+                        // anything.
+                        var property, thrown = false;
+                        try
+                        {
+                            property = obj[member.name];
+                        }
+                        catch (e)
+                        {
+                            thrown = true;
+                        }
+                        if (!thrown)
+                        {
+                            this.array.assert_type_is(property, member.idlType);
+                        }
+                    }
+                    if (member.type == "operation")
+                    {
+                        assert_equals(typeof obj[member.name], "function");
+                    }
+                }
+            }.bind(this), this.name + " interface: " + desc + ' must inherit property "' + member.name + '" with the proper type (' + i + ')');
+        }
+        // TODO: This is wrong if there are multiple operations with the same
+        // identifier.
+        // TODO: Test passing arguments of the wrong type.
+        if (member.type == "operation" && member.name && member.arguments.length)
+        {
+            test(function()
+            {
+                assert_equals(exception, null, "Unexpected exception when evaluating object");
+                assert_equals(typeof obj, expected_typeof, "wrong typeof object");
+                if (!member["static"]) {
+                    assert_inherits(obj, member.name);
+                }
+                else
+                {
+                    assert_false(member.name in obj);
+                }
+                var args = [];
+                for (var i = 0; i < member.arguments.length; i++)
+                {
+                    if (member.arguments[i].optional)
+                    {
+                        break;
+                    }
+                    assert_throws(new TypeError(), function()
+                    {
+                        obj[member.name].apply(obj, args);
+                    }.bind(this), "Called with " + i + " arguments");
+
+                    args.push(create_suitable_object(member.arguments[i].idlType));
+                }
+            }.bind(this), this.name + " interface: calling " + member.name +
+            "(" + member.arguments.map(function(m) { return m.idlType.idlType; }) +
+            ") on " + desc + " with too few arguments must throw TypeError");
+        }
+    }
+};
+
+//@}
+IdlInterface.prototype.has_stringifier = function()
+//@{
+{
+    if (this.members.some(function(member) { return member.stringifier; })) {
+        return true;
+    }
+    if (this.base &&
+        this.array.members[this.base].has_stringifier()) {
+        return true;
+    }
+    return false;
+};
+
+//@}
+function do_interface_attribute_asserts(obj, member)
+//@{
+{
+    // "For each attribute defined on the interface, there must exist a
+    // corresponding property. If the attribute was declared with the
+    // [Unforgeable] extended attribute, then the property exists on every
+    // object that implements the interface.  Otherwise, it exists on the
+    // interface’s interface prototype object."
+    //
+    // This is called by test_self() with the prototype as obj, and by
+    // test_interface_of() with the object as obj.
+    assert_own_property(obj, member.name);
+
+    // "The property has attributes { [[Get]]: G, [[Set]]: S, [[Enumerable]]:
+    // true, [[Configurable]]: configurable }, where:
+    // "configurable is false if the attribute was declared with the
+    // [Unforgeable] extended attribute and true otherwise;
+    // "G is the attribute getter, defined below; and
+    // "S is the attribute setter, also defined below."
+    var desc = Object.getOwnPropertyDescriptor(obj, member.name);
+    assert_false("value" in desc, 'property descriptor has value but is supposed to be accessor');
+    assert_false("writable" in desc, 'property descriptor has "writable" field but is supposed to be accessor');
+    assert_true(desc.enumerable, "property is not enumerable");
+    if (member.has_extended_attribute("Unforgeable"))
+    {
+        assert_false(desc.configurable, "[Unforgeable] property must not be configurable");
+    }
+    else
+    {
+        assert_true(desc.configurable, "property must be configurable");
+    }
+
+    // "The attribute getter is a Function object whose behavior when invoked
+    // is as follows:
+    // "...
+    // "The value of the Function object’s “length” property is the Number
+    // value 0."
+    assert_equals(typeof desc.get, "function", "getter must be Function");
+    assert_equals(desc.get.length, 0, "getter length must be 0");
+    // TODO: Account for LenientThis
+    assert_throws(new TypeError(), function()
+    {
+        desc.get.call({});
+    }.bind(this), "calling getter on wrong object type must throw TypeError");
+
+    // TODO: Test calling setter on the interface prototype (should throw
+    // TypeError in most cases).
+    //
+    // "The attribute setter is undefined if the attribute is declared readonly
+    // and has neither a [PutForwards] nor a [Replaceable] extended attribute
+    // declared on it.  Otherwise, it is a Function object whose behavior when
+    // invoked is as follows:
+    // "...
+    // "The value of the Function object’s “length” property is the Number
+    // value 1."
+    if (member.readonly
+    && !member.has_extended_attribute("PutForwards")
+    && !member.has_extended_attribute("Replaceable"))
+    {
+        assert_equals(desc.set, undefined, "setter must be undefined for readonly attributes");
+    }
+    else
+    {
+        assert_equals(typeof desc.set, "function", "setter must be function for PutForwards, Replaceable, or non-readonly attributes");
+        assert_equals(desc.set.length, 1, "setter length must be 1");
+    }
+}
+//@}
+
+/// IdlInterfaceMember ///
+function IdlInterfaceMember(obj)
+//@{
+{
+    /**
+     * obj is an object produced by the WebIDLParser.js "ifMember" production.
+     * We just forward all properties to this object without modification,
+     * except for special extAttrs handling.
+     */
+    for (var k in obj)
+    {
+        this[k] = obj[k];
+    }
+    if (!("extAttrs" in this))
+    {
+        this.extAttrs = [];
+    }
+}
+
+//@}
+IdlInterfaceMember.prototype = Object.create(IdlObject.prototype);
+
+/// Internal helper functions ///
+function create_suitable_object(type)
+//@{
+{
+    /**
+     * type is an object produced by the WebIDLParser.js "type" production.  We
+     * return a JavaScript value that matches the type, if we can figure out
+     * how.
+     */
+    if (type.nullable)
+    {
+        return null;
+    }
+    switch (type.idlType)
+    {
+        case "any":
+        case "boolean":
+            return true;
+
+        case "byte": case "octet": case "short": case "unsigned short":
+        case "long": case "unsigned long": case "long long":
+        case "unsigned long long": case "float": case "double":
+        case "unrestricted float": case "unrestricted double":
+            return 7;
+
+        case "DOMString":
+            return "foo";
+
+        case "object":
+            return {a: "b"};
+
+        case "Node":
+            return document.createTextNode("abc");
+    }
+    return null;
+}
+//@}
+
+/// IdlEnum ///
+// Used for IdlArray.prototype.assert_type_is
+function IdlEnum(obj)
+//@{
+{
+    /**
+     * obj is an object produced by the WebIDLParser.js "dictionary"
+     * production.
+     */
+
+    /** Self-explanatory. */
+    this.name = obj.name;
+
+    /** An array of values produced by the "enum" production. */
+    this.values = obj.values;
+
+}
+//@}
+
+IdlEnum.prototype = Object.create(IdlObject.prototype);
+
+/// IdlTypedef ///
+// Used for IdlArray.prototype.assert_type_is
+function IdlTypedef(obj)
+//@{
+{
+    /**
+     * obj is an object produced by the WebIDLParser.js "typedef"
+     * production.
+     */
+
+    /** Self-explanatory. */
+    this.name = obj.name;
+
+    /** An array of values produced by the "typedef" production. */
+    this.values = obj.values;
+
+}
+//@}
+
+IdlTypedef.prototype = Object.create(IdlObject.prototype);
+
+}());
+// vim: set expandtab shiftwidth=4 tabstop=4 foldmarker=@{,@} foldmethod=marker: