The Tor Browser: mobile/android/base/tests/robocop_head.js@b8a032363ba2 (annotated)

mobile/android/base/tests/robocop_head.js@b8a032363ba2 (annotated)

mobile/android/base/tests/robocop_head.js

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: JavaScript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim:set ts=2 sw=2 sts=2 et: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /*
  * This file contains common code that is loaded before each test file(s).
  * See http://developer.mozilla.org/en/docs/Writing_xpcshell-based_unit_tests
  * for more information.
  */
 const _XPCSHELL_TIMEOUT_MS = 5 * 60 * 1000;
 var _quit = false;
 var _passed = true;
 var _tests_pending = 0;
 var _passedChecks = 0, _falsePassedChecks = 0;
 var _todoChecks = 0;
 var _cleanupFunctions = [];
 var _pendingTimers = [];
 var _profileInitialized = false;
 function _dump(str) {
   let start = /^TEST-/.test(str) ? "\n" : "";
   if (typeof _XPCSHELL_PROCESS == "undefined") {
     dump(start + str);
   } else {
     dump(start + _XPCSHELL_PROCESS + ": " + str);
   }
 }
 // Disable automatic network detection, so tests work correctly when
 // not connected to a network.
 let (ios = Components.classes["@mozilla.org/network/io-service;1"]
            .getService(Components.interfaces.nsIIOService2)) {
   ios.manageOfflineStatus = false;
   ios.offline = false;
 }
 // Determine if we're running on parent or child
 let runningInParent = true;
 try {
   runningInParent = Components.classes["@mozilla.org/xre/runtime;1"].
                     getService(Components.interfaces.nsIXULRuntime).processType
                     == Components.interfaces.nsIXULRuntime.PROCESS_TYPE_DEFAULT;
 }
 catch (e) { }
 try {
   if (runningInParent) {
     let prefs = Components.classes["@mozilla.org/preferences-service;1"]
                 .getService(Components.interfaces.nsIPrefBranch);
     // disable necko IPC security checks for xpcshell, as they lack the
     // docshells needed to pass them
     prefs.setBoolPref("network.disable.ipc.security", true);
     // Disable IPv6 lookups for 'localhost' on windows.
     if ("@mozilla.org/windows-registry-key;1" in Components.classes) {
       prefs.setCharPref("network.dns.ipv4OnlyDomains", "localhost");
     }
   }
 }
 catch (e) { }
 // Enable crash reporting, if possible
 // We rely on the Python harness to set MOZ_CRASHREPORTER_NO_REPORT
 // and handle checking for minidumps.
 // Note that if we're in a child process, we don't want to init the
 // crashreporter component.
 try { // nsIXULRuntime is not available in some configurations.
   if (runningInParent &&
       "@mozilla.org/toolkit/crash-reporter;1" in Components.classes) {
     // Remember to update </toolkit/crashreporter/test/unit/test_crashreporter.js>
     // too if you change this initial setting.
     let (crashReporter =
           Components.classes["@mozilla.org/toolkit/crash-reporter;1"]
           .getService(Components.interfaces.nsICrashReporter)) {
       crashReporter.enabled = true;
       crashReporter.minidumpPath = do_get_cwd();
     }
   }
 }
 catch (e) { }
 /**
  * Date.now() is not necessarily monotonically increasing (insert sob story
  * about times not being the right tool to use for measuring intervals of time,
  * robarnold can tell all), so be wary of error by erring by at least
  * _timerFuzz ms.
  */
 const _timerFuzz = 15;
 function _Timer(func, delay) {
   delay = Number(delay);
   if (delay < 0)
     do_throw("do_timeout() delay must be nonnegative");
   if (typeof func !== "function")
     do_throw("string callbacks no longer accepted; use a function!");
   this._func = func;
   this._start = Date.now();
   this._delay = delay;
   var timer = Components.classes["@mozilla.org/timer;1"]
                         .createInstance(Components.interfaces.nsITimer);
   timer.initWithCallback(this, delay + _timerFuzz, timer.TYPE_ONE_SHOT);
   // Keep timer alive until it fires
   _pendingTimers.push(timer);
 }
 _Timer.prototype = {
   QueryInterface: function(iid) {
     if (iid.equals(Components.interfaces.nsITimerCallback) ||
         iid.equals(Components.interfaces.nsISupports))
       return this;
     throw Components.results.NS_ERROR_NO_INTERFACE;
   },
   notify: function(timer) {
     _pendingTimers.splice(_pendingTimers.indexOf(timer), 1);
     // The current nsITimer implementation can undershoot, but even if it
     // couldn't, paranoia is probably a virtue here given the potential for
     // random orange on tinderboxen.
     var end = Date.now();
     var elapsed = end - this._start;
     if (elapsed >= this._delay) {
       try {
         this._func.call(null);
       } catch (e) {
         do_throw("exception thrown from do_timeout callback: " + e);
       }
       return;
     }
     // Timer undershot, retry with a little overshoot to try to avoid more
     // undershoots.
     var newDelay = this._delay - elapsed;
     do_timeout(newDelay, this._func);
   }
 };
 function _do_main() {
   if (_quit)
     return;
   _dump("TEST-INFO | (xpcshell/head.js) | running event loop\n");
   var thr = Components.classes["@mozilla.org/thread-manager;1"]
                       .getService().currentThread;
   while (!_quit)
     thr.processNextEvent(true);
   while (thr.hasPendingEvents())
     thr.processNextEvent(true);
 }
 function _do_quit() {
   _dump("TEST-INFO | (xpcshell/head.js) | exiting test\n");
   _quit = true;
 }
 function _dump_exception_stack(stack) {
   stack.split("\n").forEach(function(frame) {
     if (!frame)
       return;
     // frame is of the form "fname(args)@file:line"
     let frame_regexp = new RegExp("(.*)\\(.*\\)@(.*):(\\d*)", "g");
     let parts = frame_regexp.exec(frame);
     if (parts)
         dump("JS frame :: " + parts[2] + " :: " + (parts[1] ? parts[1] : "anonymous")
              + " :: line " + parts[3] + "\n");
     else /* Could be a -e (command line string) style location. */
         dump("JS frame :: " + frame + "\n");
   });
 }
 /**
  * Overrides idleService with a mock.  Idle is commonly used for maintenance
  * tasks, thus if a test uses a service that requires the idle service, it will
  * start handling them.
  * This behaviour would cause random failures and slowdown tests execution,
  * for example by running database vacuum or cleanups for each test.
  *
  * @note Idle service is overridden by default.  If a test requires it, it will
  *       have to call do_get_idle() function at least once before use.
  */
 var _fakeIdleService = {
   get registrar() {
     delete this.registrar;
     return this.registrar =
       Components.manager.QueryInterface(Components.interfaces.nsIComponentRegistrar);
   },
   contractID: "@mozilla.org/widget/idleservice;1",
   get CID() this.registrar.contractIDToCID(this.contractID),
   activate: function FIS_activate()
   {
     if (!this.originalFactory) {
       // Save original factory.
       this.originalFactory =
         Components.manager.getClassObject(Components.classes[this.contractID],
                                           Components.interfaces.nsIFactory);
       // Unregister original factory.
       this.registrar.unregisterFactory(this.CID, this.originalFactory);
       // Replace with the mock.
       this.registrar.registerFactory(this.CID, "Fake Idle Service",
                                      this.contractID, this.factory
       );
     }
   },
   deactivate: function FIS_deactivate()
   {
     if (this.originalFactory) {
       // Unregister the mock.
       this.registrar.unregisterFactory(this.CID, this.factory);
       // Restore original factory.
       this.registrar.registerFactory(this.CID, "Idle Service",
                                      this.contractID, this.originalFactory);
       delete this.originalFactory;
     }
   },
   factory: {
     // nsIFactory
     createInstance: function (aOuter, aIID)
     {
       if (aOuter) {
         throw Components.results.NS_ERROR_NO_AGGREGATION;
       }
       return _fakeIdleService.QueryInterface(aIID);
     },
     lockFactory: function (aLock) {
       throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
     },
     QueryInterface: function(aIID) {
       if (aIID.equals(Components.interfaces.nsIFactory) ||
           aIID.equals(Components.interfaces.nsISupports)) {
         return this;
       }
       throw Components.results.NS_ERROR_NO_INTERFACE;
     }
   },
   // nsIIdleService
   get idleTime() 0,
   addIdleObserver: function () {},
   removeIdleObserver: function () {},
   QueryInterface: function(aIID) {
     // Useful for testing purposes, see test_get_idle.js.
     if (aIID.equals(Components.interfaces.nsIFactory)) {
       return this.factory;
     }
     if (aIID.equals(Components.interfaces.nsIIdleService) ||
         aIID.equals(Components.interfaces.nsISupports)) {
       return this;
     }
     throw Components.results.NS_ERROR_NO_INTERFACE;
   }
 }
 /**
  * Restores the idle service factory if needed and returns the service's handle.
  * @return A handle to the idle service.
  */
 function do_get_idle() {
   _fakeIdleService.deactivate();
   return Components.classes[_fakeIdleService.contractID]
                    .getService(Components.interfaces.nsIIdleService);
 }
 // Map resource://test/ to current working directory and
 // resource://testing-common/ to the shared test modules directory.
 function _register_protocol_handlers() {
   let (ios = Components.classes["@mozilla.org/network/io-service;1"]
              .getService(Components.interfaces.nsIIOService)) {
     let protocolHandler =
       ios.getProtocolHandler("resource")
          .QueryInterface(Components.interfaces.nsIResProtocolHandler);
     let curDirURI = ios.newFileURI(do_get_cwd());
     protocolHandler.setSubstitution("test", curDirURI);
     if (this._TESTING_MODULES_DIR) {
       let modulesFile = Components.classes["@mozilla.org/file/local;1"].
                         createInstance(Components.interfaces.nsILocalFile);
       modulesFile.initWithPath(_TESTING_MODULES_DIR);
       if (!modulesFile.exists()) {
         throw new Error("Specified modules directory does not exist: " +
                         _TESTING_MODULES_DIR);
       }
       if (!modulesFile.isDirectory()) {
         throw new Error("Specified modules directory is not a directory: " +
                         _TESTING_MODULES_DIR);
       }
       let modulesURI = ios.newFileURI(modulesFile);
       protocolHandler.setSubstitution("testing-common", modulesURI);
     }
   }
 }
 function _execute_test() {
   _register_protocol_handlers();
   // Override idle service by default.
   // Call do_get_idle() to restore the factory and get the service.
   _fakeIdleService.activate();
   // Terminate asynchronous tests when a global timeout occurs.
   do_timeout(_XPCSHELL_TIMEOUT_MS, function _do_main_timeout() {
     try {
       do_throw("test timed out");
     } catch (e if e == Components.results.NS_ERROR_ABORT) {
       // We don't want do_timeout to report the do_throw exception again.
     }
   });
   // _HEAD_FILES is dynamically defined by <runxpcshelltests.py>.
   _load_files(_HEAD_FILES);
   // _TEST_FILE is dynamically defined by <runxpcshelltests.py>.
   _load_files(_TEST_FILE);
   try {
     do_test_pending();
     run_test();
     do_test_finished();
     _do_main();
   } catch (e) {
     _passed = false;
     // do_check failures are already logged and set _quit to true and throw
     // NS_ERROR_ABORT. If both of those are true it is likely this exception
     // has already been logged so there is no need to log it again. It's
     // possible that this will mask an NS_ERROR_ABORT that happens after a
     // do_check failure though.
     if (!_quit || e != Components.results.NS_ERROR_ABORT) {
       msg = "TEST-UNEXPECTED-FAIL | ";
       if (e.fileName) {
         msg += e.fileName;
         if (e.lineNumber) {
           msg += ":" + e.lineNumber;
         }
       } else {
         msg += "xpcshell/head.js";
       }
       msg += " | " + e;
       if (e.stack) {
         _dump(msg + " - See following stack:\n");
         _dump_exception_stack(e.stack);
       }
       else {
         _dump(msg + "\n");
       }
     }
   }
   // _TAIL_FILES is dynamically defined by <runxpcshelltests.py>.
   _load_files(_TAIL_FILES);
   // Execute all of our cleanup functions.
   var func;
   while ((func = _cleanupFunctions.pop()))
     func();
   // Restore idle service to avoid leaks.
   _fakeIdleService.deactivate();
   if (!_passed)
     return;
   var truePassedChecks = _passedChecks - _falsePassedChecks;
   if (truePassedChecks > 0) {
     _dump("TEST-PASS | (xpcshell/head.js) | " + truePassedChecks + " (+ " +
             _falsePassedChecks + ") check(s) passed\n");
     _dump("TEST-INFO | (xpcshell/head.js) | " + _todoChecks +
             " check(s) todo\n");
   } else {
     // ToDo: switch to TEST-UNEXPECTED-FAIL when all tests have been updated. (Bug 496443)
     _dump("TEST-INFO | (xpcshell/head.js) | No (+ " + _falsePassedChecks + ") checks actually run\n");
   }
 }
 /**
  * Loads files.
  *
  * @param aFiles Array of files to load.
  */
 function _load_files(aFiles) {
   function loadTailFile(element, index, array) {
     load(element);
   }
   aFiles.forEach(loadTailFile);
 }
 /************** Functions to be used from the tests **************/
 /**
  * Prints a message to the output log.
  */
 function do_print(msg) {
   var caller_stack = Components.stack.caller;
   _dump("TEST-INFO | " + caller_stack.filename + " | " + msg + "\n");
 }
 /**
  * Calls the given function at least the specified number of milliseconds later.
  * The callback will not undershoot the given time, but it might overshoot --
  * don't expect precision!
  *
  * @param delay : uint
  *   the number of milliseconds to delay
  * @param callback : function() : void
  *   the function to call
  */
 function do_timeout(delay, func) {
   new _Timer(func, Number(delay));
 }
 function do_execute_soon(callback) {
   do_test_pending();
   var tm = Components.classes["@mozilla.org/thread-manager;1"]
                      .getService(Components.interfaces.nsIThreadManager);
   tm.mainThread.dispatch({
     run: function() {
       try {
         callback();
       } catch (e) {
         // do_check failures are already logged and set _quit to true and throw
         // NS_ERROR_ABORT. If both of those are true it is likely this exception
         // has already been logged so there is no need to log it again. It's
         // possible that this will mask an NS_ERROR_ABORT that happens after a
         // do_check failure though.
         if (!_quit || e != Components.results.NS_ERROR_ABORT) {
           _dump("TEST-UNEXPECTED-FAIL | (xpcshell/head.js) | " + e);
           if (e.stack) {
             dump(" - See following stack:\n");
             _dump_exception_stack(e.stack);
           }
           else {
             dump("\n");
           }
           _do_quit();
         }
       }
       finally {
         do_test_finished();
       }
     }
   }, Components.interfaces.nsIThread.DISPATCH_NORMAL);
 }
 function do_throw(text, stack) {
   if (!stack)
     stack = Components.stack.caller;
   _passed = false;
   _dump("TEST-UNEXPECTED-FAIL | " + stack.filename + " | " + text +
         " - See following stack:\n");
   var frame = Components.stack;
   while (frame != null) {
     _dump(frame + "\n");
     frame = frame.caller;
   }
   _do_quit();
   throw Components.results.NS_ERROR_ABORT;
 }
 function do_throw_todo(text, stack) {
   if (!stack)
     stack = Components.stack.caller;
   _passed = false;
   _dump("TEST-UNEXPECTED-PASS | " + stack.filename + " | " + text +
         " - See following stack:\n");
   var frame = Components.stack;
   while (frame != null) {
     _dump(frame + "\n");
     frame = frame.caller;
   }
   _do_quit();
   throw Components.results.NS_ERROR_ABORT;
 }
 function do_report_unexpected_exception(ex, text) {
   var caller_stack = Components.stack.caller;
   text = text ? text + " - " : "";
   _passed = false;
   _dump("TEST-UNEXPECTED-FAIL | " + caller_stack.filename + " | " + text +
         "Unexpected exception " + ex + ", see following stack:\n" + ex.stack +
         "\n");
   _do_quit();
   throw Components.results.NS_ERROR_ABORT;
 }
 function do_note_exception(ex, text) {
   var caller_stack = Components.stack.caller;
   text = text ? text + " - " : "";
   _dump("TEST-INFO | " + caller_stack.filename + " | " + text +
         "Swallowed exception " + ex + ", see following stack:\n" + ex.stack +
         "\n");
 }
 function _do_check_neq(left, right, stack, todo) {
   if (!stack)
     stack = Components.stack.caller;
   var text = left + " != " + right;
   if (left == right) {
     if (!todo) {
       do_throw(text, stack);
     } else {
       ++_todoChecks;
       _dump("TEST-KNOWN-FAIL | " + stack.filename + " | [" + stack.name +
             " : " + stack.lineNumber + "] " + text +"\n");
     }
   } else {
     if (!todo) {
       ++_passedChecks;
       _dump("TEST-PASS | " + stack.filename + " | [" + stack.name + " : " +
             stack.lineNumber + "] " + text + "\n");
     } else {
       do_throw_todo(text, stack);
     }
   }
 }
 function do_check_neq(left, right, stack) {
   if (!stack)
     stack = Components.stack.caller;
   _do_check_neq(left, right, stack, false);
 }
 function todo_check_neq(left, right, stack) {
   if (!stack)
       stack = Components.stack.caller;
   _do_check_neq(left, right, stack, true);
 }
 function do_report_result(passed, text, stack, todo) {
   if (passed) {
     if (todo) {
       do_throw_todo(text, stack);
     } else {
       ++_passedChecks;
       _dump("TEST-PASS | " + stack.filename + " | [" + stack.name + " : " +
             stack.lineNumber + "] " + text + "\n");
     }
   } else {
     if (todo) {
       ++_todoChecks;
       _dump("TEST-KNOWN-FAIL | " + stack.filename + " | [" + stack.name +
             " : " + stack.lineNumber + "] " + text +"\n");
     } else {
       do_throw(text, stack);
     }
   }
 }
 function _do_check_eq(left, right, stack, todo) {
   if (!stack)
     stack = Components.stack.caller;
   var text = left + " == " + right;
   do_report_result(left == right, text, stack, todo);
 }
 function do_check_eq(left, right, stack) {
   if (!stack)
     stack = Components.stack.caller;
   _do_check_eq(left, right, stack, false);
 }
 function todo_check_eq(left, right, stack) {
   if (!stack)
       stack = Components.stack.caller;
   _do_check_eq(left, right, stack, true);
 }
 function do_check_true(condition, stack) {
   if (!stack)
     stack = Components.stack.caller;
   do_check_eq(condition, true, stack);
 }
 function todo_check_true(condition, stack) {
   if (!stack)
     stack = Components.stack.caller;
   todo_check_eq(condition, true, stack);
 }
 function do_check_false(condition, stack) {
   if (!stack)
     stack = Components.stack.caller;
   do_check_eq(condition, false, stack);
 }
 function todo_check_false(condition, stack) {
   if (!stack)
     stack = Components.stack.caller;
   todo_check_eq(condition, false, stack);
 }
 function do_check_null(condition, stack=Components.stack.caller) {
   do_check_eq(condition, null, stack);
 }
 function todo_check_null(condition, stack=Components.stack.caller) {
   todo_check_eq(condition, null, stack);
 }
 /**
  * Check that |value| matches |pattern|.
  *
  * A |value| matches a pattern |pattern| if any one of the following is true:
  *
  * - |value| and |pattern| are both objects; |pattern|'s enumerable
  *   properties' values are valid patterns; and for each enumerable
  *   property |p| of |pattern|, plus 'length' if present at all, |value|
  *   has a property |p| whose value matches |pattern.p|. Note that if |j|
  *   has other properties not present in |p|, |j| may still match |p|.
  *
  * - |value| and |pattern| are equal string, numeric, or boolean literals
  *
  * - |pattern| is |undefined| (this is a wildcard pattern)
  *
  * - typeof |pattern| == "function", and |pattern(value)| is true.
  *
  * For example:
  *
  * do_check_matches({x:1}, {x:1})       // pass
  * do_check_matches({x:1}, {})          // fail: all pattern props required
  * do_check_matches({x:1}, {x:2})       // fail: values must match
  * do_check_matches({x:1}, {x:1, y:2})  // pass: extra props tolerated
  *
  * // Property order is irrelevant.
  * do_check_matches({x:"foo", y:"bar"}, {y:"bar", x:"foo"}) // pass
  *
  * do_check_matches({x:undefined}, {x:1}) // pass: 'undefined' is wildcard
  * do_check_matches({x:undefined}, {x:2})
  * do_check_matches({x:undefined}, {y:2}) // fail: 'x' must still be there
  *
  * // Patterns nest.
  * do_check_matches({a:1, b:{c:2,d:undefined}}, {a:1, b:{c:2,d:3}})
  *
  * // 'length' property counts, even if non-enumerable.
  * do_check_matches([3,4,5], [3,4,5])     // pass
  * do_check_matches([3,4,5], [3,5,5])     // fail; value doesn't match
  * do_check_matches([3,4,5], [3,4,5,6])   // fail; length doesn't match
  *
  * // functions in patterns get applied.
  * do_check_matches({foo:function (v) v.length == 2}, {foo:"hi"}) // pass
  * do_check_matches({foo:function (v) v.length == 2}, {bar:"hi"}) // fail
  * do_check_matches({foo:function (v) v.length == 2}, {foo:"hello"}) // fail
  *
  * // We don't check constructors, prototypes, or classes. However, if
  * // pattern has a 'length' property, we require values to match that as
  * // well, even if 'length' is non-enumerable in the pattern. So arrays
  * // are useful as patterns.
  * do_check_matches({0:0, 1:1, length:2}, [0,1])  // pass
  * do_check_matches({0:1}, [1,2])                 // pass
  * do_check_matches([0], {0:0, length:1})         // pass
  *
  * Notes:
  *
  * The 'length' hack gives us reasonably intuitive handling of arrays.
  *
  * This is not a tight pattern-matcher; it's only good for checking data
  * from well-behaved sources. For example:
  * - By default, we don't mind values having extra properties.
  * - We don't check for proxies or getters.
  * - We don't check the prototype chain.
  * However, if you know the values are, say, JSON, which is pretty
  * well-behaved, and if you want to tolerate additional properties
  * appearing on the JSON for backward-compatibility, then do_check_matches
  * is ideal. If you do want to be more careful, you can use function
  * patterns to implement more stringent checks.
  */
 function do_check_matches(pattern, value, stack=Components.stack.caller, todo=false) {
   var matcher = pattern_matcher(pattern);
   var text = "VALUE: " + uneval(value) + "\nPATTERN: " + uneval(pattern) + "\n";
   var diagnosis = []
   if (matcher(value, diagnosis)) {
     do_report_result(true, "value matches pattern:\n" + text, stack, todo);
   } else {
     text = ("value doesn't match pattern:\n" +
             text +
             "DIAGNOSIS: " +
             format_pattern_match_failure(diagnosis[0]) + "\n");
     do_report_result(false, text, stack, todo);
   }
 }
 function todo_check_matches(pattern, value, stack=Components.stack.caller) {
   do_check_matches(pattern, value, stack, true);
 }
 // Return a pattern-matching function of one argument, |value|, that
 // returns true if |value| matches |pattern|.
 //
 // If the pattern doesn't match, and the pattern-matching function was
 // passed its optional |diagnosis| argument, the pattern-matching function
 // sets |diagnosis|'s '0' property to a JSON-ish description of the portion
 // of the pattern that didn't match, which can be formatted legibly by
 // format_pattern_match_failure.
 function pattern_matcher(pattern) {
   function explain(diagnosis, reason) {
     if (diagnosis) {
       diagnosis[0] = reason;
     }
     return false;
   }
   if (typeof pattern == "function") {
     return pattern;
   } else if (typeof pattern == "object" && pattern) {
     var matchers = [[p, pattern_matcher(pattern[p])] for (p in pattern)];
     // Kludge: include 'length', if not enumerable. (If it is enumerable,
     // we picked it up in the array comprehension, above.
     ld = Object.getOwnPropertyDescriptor(pattern, 'length');
     if (ld && !ld.enumerable) {
       matchers.push(['length', pattern_matcher(pattern.length)])
     }
     return function (value, diagnosis) {
       if (!(value && typeof value == "object")) {
         return explain(diagnosis, "value not object");
       }
       for (let [p, m] of matchers) {
         var element_diagnosis = [];
         if (!(p in value && m(value[p], element_diagnosis))) {
           return explain(diagnosis, { property:p,
                                       diagnosis:element_diagnosis[0] });
         }
       }
       return true;
     };
   } else if (pattern === undefined) {
     return function(value) { return true; };
   } else {
     return function (value, diagnosis) {
       if (value !== pattern) {
         return explain(diagnosis, "pattern " + uneval(pattern) + " not === to value " + uneval(value));
       }
       return true;
     };
   }
 }
 // Format an explanation for a pattern match failure, as stored in the
 // second argument to a matching function.
 function format_pattern_match_failure(diagnosis, indent="") {
   var a;
   if (!diagnosis) {
     a = "Matcher did not explain reason for mismatch.";
   } else if (typeof diagnosis == "string") {
     a = diagnosis;
   } else if (diagnosis.property) {
     a = "Property " + uneval(diagnosis.property) + " of object didn't match:\n";
     a += format_pattern_match_failure(diagnosis.diagnosis, indent + "  ");
   }
   return indent + a;
 }
 function do_test_pending() {
   ++_tests_pending;
   _dump("TEST-INFO | (xpcshell/head.js) | test " + _tests_pending +
          " pending\n");
 }
 function do_test_finished() {
   _dump("TEST-INFO | (xpcshell/head.js) | test " + _tests_pending +
          " finished\n");
   if (--_tests_pending == 0)
     _do_quit();
 }
 function do_get_file(path, allowNonexistent) {
   try {
     let lf = Components.classes["@mozilla.org/file/directory_service;1"]
       .getService(Components.interfaces.nsIProperties)
       .get("CurWorkD", Components.interfaces.nsILocalFile);
     let bits = path.split("/");
     for (let i = 0; i < bits.length; i++) {
       if (bits[i]) {
         if (bits[i] == "..")
           lf = lf.parent;
         else
           lf.append(bits[i]);
       }
     }
     if (!allowNonexistent && !lf.exists()) {
       // Not using do_throw(): caller will continue.
       _passed = false;
       var stack = Components.stack.caller;
       _dump("TEST-UNEXPECTED-FAIL | " + stack.filename + " | [" +
             stack.name + " : " + stack.lineNumber + "] " + lf.path +
             " does not exist\n");
     }
     return lf;
   }
   catch (ex) {
     do_throw(ex.toString(), Components.stack.caller);
   }
   return null;
 }
 // do_get_cwd() isn't exactly self-explanatory, so provide a helper
 function do_get_cwd() {
   return do_get_file("");
 }
 function do_load_manifest(path) {
   var lf = do_get_file(path);
   const nsIComponentRegistrar = Components.interfaces.nsIComponentRegistrar;
   do_check_true(Components.manager instanceof nsIComponentRegistrar);
   // Previous do_check_true() is not a test check.
   ++_falsePassedChecks;
   Components.manager.autoRegister(lf);
 }
 /**
  * Parse a DOM document.
  *
  * @param aPath File path to the document.
  * @param aType Content type to use in DOMParser.
  *
  * @return nsIDOMDocument from the file.
  */
 function do_parse_document(aPath, aType) {
   switch (aType) {
     case "application/xhtml+xml":
     case "application/xml":
     case "text/xml":
       break;
     default:
       do_throw("type: expected application/xhtml+xml, application/xml or text/xml," +
                  " got '" + aType + "'",
                Components.stack.caller);
   }
   var lf = do_get_file(aPath);
   const C_i = Components.interfaces;
   const parserClass = "@mozilla.org/xmlextras/domparser;1";
   const streamClass = "@mozilla.org/network/file-input-stream;1";
   var stream = Components.classes[streamClass]
                          .createInstance(C_i.nsIFileInputStream);
   stream.init(lf, -1, -1, C_i.nsIFileInputStream.CLOSE_ON_EOF);
   var parser = Components.classes[parserClass]
                          .createInstance(C_i.nsIDOMParser);
   var doc = parser.parseFromStream(stream, null, lf.fileSize, aType);
   parser = null;
   stream = null;
   lf = null;
   return doc;
 }
 /**
  * Registers a function that will run when the test harness is done running all
  * tests.
  *
  * @param aFunction
  *        The function to be called when the test harness has finished running.
  */
 function do_register_cleanup(aFunction)
 {
   _cleanupFunctions.push(aFunction);
 }
 /**
  * Registers a directory with the profile service,
  * and return the directory as an nsILocalFile.
  *
  * @return nsILocalFile of the profile directory.
  */
 function do_get_profile() {
   if (!runningInParent) {
     _dump("TEST-INFO | (xpcshell/head.js) | Ignoring profile creation from child process.\n");
     return null;
   }
   if (!_profileInitialized) {
     // Since we have a profile, we will notify profile shutdown topics at
     // the end of the current test, to ensure correct cleanup on shutdown.
     do_register_cleanup(function() {
       let obsSvc = Components.classes["@mozilla.org/observer-service;1"].
                    getService(Components.interfaces.nsIObserverService);
       obsSvc.notifyObservers(null, "profile-change-net-teardown", null);
       obsSvc.notifyObservers(null, "profile-change-teardown", null);
       obsSvc.notifyObservers(null, "profile-before-change", null);
     });
   }
   let env = Components.classes["@mozilla.org/process/environment;1"]
                       .getService(Components.interfaces.nsIEnvironment);
   // the python harness sets this in the environment for us
   let profd = env.get("XPCSHELL_TEST_PROFILE_DIR");
   let file = Components.classes["@mozilla.org/file/local;1"]
                        .createInstance(Components.interfaces.nsILocalFile);
   file.initWithPath(profd);
   let dirSvc = Components.classes["@mozilla.org/file/directory_service;1"]
                          .getService(Components.interfaces.nsIProperties);
   let provider = {
     getFile: function(prop, persistent) {
       persistent.value = true;
       if (prop == "ProfD" || prop == "ProfLD" || prop == "ProfDS" ||
           prop == "ProfLDS" || prop == "TmpD") {
         return file.clone();
       }
       throw Components.results.NS_ERROR_FAILURE;
     },
     QueryInterface: function(iid) {
       if (iid.equals(Components.interfaces.nsIDirectoryServiceProvider) ||
           iid.equals(Components.interfaces.nsISupports)) {
         return this;
       }
       throw Components.results.NS_ERROR_NO_INTERFACE;
     }
   };
   dirSvc.QueryInterface(Components.interfaces.nsIDirectoryService)
         .registerProvider(provider);
   let obsSvc = Components.classes["@mozilla.org/observer-service;1"].
         getService(Components.interfaces.nsIObserverService);
   if (!_profileInitialized) {
     obsSvc.notifyObservers(null, "profile-do-change", "xpcshell-do-get-profile");
     _profileInitialized = true;
   }
   // The methods of 'provider' will retain this scope so null out everything
   // to avoid spurious leak reports.
   env = null;
   profd = null;
   dirSvc = null;
   provider = null;
   obsSvc = null;
   return file.clone();
 }
 /**
  * This function loads head.js (this file) in the child process, so that all
  * functions defined in this file (do_throw, etc) are available to subsequent
  * sendCommand calls.  It also sets various constants used by these functions.
  *
  * (Note that you may use sendCommand without calling this function first;  you
  * simply won't have any of the functions in this file available.)
  */
 function do_load_child_test_harness()
 {
   // Make sure this isn't called from child process
   if (!runningInParent) {
     do_throw("run_test_in_child cannot be called from child!");
   }
   // Allow to be called multiple times, but only run once
   if (typeof do_load_child_test_harness.alreadyRun != "undefined")
     return;
   do_load_child_test_harness.alreadyRun = 1;
   _XPCSHELL_PROCESS = "parent";
   let command =
         "const _HEAD_JS_PATH=" + uneval(_HEAD_JS_PATH) + "; "
       + "const _HTTPD_JS_PATH=" + uneval(_HTTPD_JS_PATH) + "; "
       + "const _HEAD_FILES=" + uneval(_HEAD_FILES) + "; "
       + "const _TAIL_FILES=" + uneval(_TAIL_FILES) + "; "
       + "const _XPCSHELL_PROCESS='child';";
   if (this._TESTING_MODULES_DIR) {
     command += " const _TESTING_MODULES_DIR=" + uneval(_TESTING_MODULES_DIR) + ";";
   }
   command += " load(_HEAD_JS_PATH);";
   sendCommand(command);
 }
 /**
  * Runs an entire xpcshell unit test in a child process (rather than in chrome,
  * which is the default).
  *
  * This function returns immediately, before the test has completed.
  *
  * @param testFile
  *        The name of the script to run.  Path format same as load().
  * @param optionalCallback.
  *        Optional function to be called (in parent) when test on child is
  *        complete.  If provided, the function must call do_test_finished();
  */
 function run_test_in_child(testFile, optionalCallback)
 {
   var callback = (typeof optionalCallback == 'undefined') ?
                     do_test_finished : optionalCallback;
   do_load_child_test_harness();
   var testPath = do_get_file(testFile).path.replace(/\\/g, "/");
   do_test_pending();
   sendCommand("_dump('CHILD-TEST-STARTED'); "
               + "const _TEST_FILE=['" + testPath + "']; _execute_test(); "
               + "_dump('CHILD-TEST-COMPLETED');",
               callback);
 }
 /**
  * Add a test function to the list of tests that are to be run asynchronously.
  *
  * Each test function must call run_next_test() when it's done. Test files
  * should call run_next_test() in their run_test function to execute all
  * async tests.
  *
  * @return the test function that was passed in.
  */
 let _gTests = [];
 function add_test(func) {
   _gTests.push([false, func]);
   return func;
 }
 // We lazy import Task.jsm so we don't incur a run-time penalty for all tests.
 let _Task;
 /**
  * Add a test function which is a Task function.
  *
  * Task functions are functions fed into Task.jsm's Task.spawn(). They are
  * generators that emit promises.
  *
  * If an exception is thrown, a do_check_* comparison fails, or if a rejected
  * promise is yielded, the test function aborts immediately and the test is
  * reported as a failure.
  *
  * Unlike add_test(), there is no need to call run_next_test(). The next test
  * will run automatically as soon the task function is exhausted. To trigger
  * premature (but successful) termination of the function, simply return or
  * throw a Task.Result instance.
  *
  * Example usage:
  *
  * add_task(function test() {
  *   let result = yield Promise.resolve(true);
  *
  *   do_check_true(result);
  *
  *   let secondary = yield someFunctionThatReturnsAPromise(result);
  *   do_check_eq(secondary, "expected value");
  * });
  *
  * add_task(function test_early_return() {
  *   let result = yield somethingThatReturnsAPromise();
  *
  *   if (!result) {
  *     // Test is ended immediately, with success.
  *     return;
  *   }
  *
  *   do_check_eq(result, "foo");
  * });
  */
 function add_task(func) {
   if (!_Task) {
     let ns = {};
     _Task = Components.utils.import("resource://gre/modules/Task.jsm", ns).Task;
   }
   _gTests.push([true, func]);
 }
 /**
  * Runs the next test function from the list of async tests.
  */
 let _gRunningTest = null;
 let _gTestIndex = 0; // The index of the currently running test.
 function run_next_test()
 {
   function _run_next_test()
   {
     if (_gTestIndex < _gTests.length) {
       do_test_pending();
       let _isTask;
       [_isTask, _gRunningTest] = _gTests[_gTestIndex++];
       _dump("TEST-INFO | " + _TEST_FILE + " | Starting " + _gRunningTest.name);
       if (_isTask) {
         _Task.spawn(_gRunningTest)
              .then(run_next_test, do_report_unexpected_exception);
       } else {
         // Exceptions do not kill asynchronous tests, so they'll time out.
         try {
           _gRunningTest();
         } catch (e) {
           do_throw(e);
         }
       }
     }
   }
   // For sane stacks during failures, we execute this code soon, but not now.
   // We do this now, before we call do_test_finished(), to ensure the pending
   // counter (_tests_pending) never reaches 0 while we still have tests to run
   // (do_execute_soon bumps that counter).
   do_execute_soon(_run_next_test);
   if (_gRunningTest !== null) {
     // Close the previous test do_test_pending call.
     do_test_finished();
   }
 }
 /**
  * End of code adapted from xpcshell head.js
  */
 /**
  * JavaBridge facilitates communication between Java and JS. See
  * JavascriptBridge.java for the corresponding JavascriptBridge and docs.
  */
 function JavaBridge(obj) {
   this._EVENT_TYPE = "Robocop:JS";
   this._target = obj;
   // The number of replies needed to answer all outstanding sync calls.
   this._repliesNeeded = 0;
   this._Services.obs.addObserver(this, this._EVENT_TYPE, false);
   this._sendMessage("notify-loaded", []);
 };
 JavaBridge.prototype = {
   _Services: Components.utils.import(
     "resource://gre/modules/Services.jsm", {}).Services,
   _sendMessageToJava: Components.utils.import(
     "resource://gre/modules/Messaging.jsm", {}).sendMessageToJava,
   _sendMessage: function (innerType, args) {
     this._sendMessageToJava({
       type: this._EVENT_TYPE,
       innerType: innerType,
       method: args[0],
       args: Array.prototype.slice.call(args, 1),
     });
   },
   observe: function(subject, topic, data) {
     let message = JSON.parse(data);
     if (message.innerType === "sync-reply") {
       // Reply to our Javascript-to-Java sync call
       this._repliesNeeded--;
       return;
     }
     // Call the corresponding method on the target
     try {
       this._target[message.method].apply(this._target, message.args);
     } catch (e) {
       do_report_unexpected_exception(e, "Failed to call " + message.method);
     }
     if (message.innerType === "sync-call") {
       // Reply for sync message
       this._sendMessage("sync-reply", [message.method]);
     }
   },
   /**
    * Synchronously call a method in Java,
    * given the method name followed by a list of arguments.
    */
   syncCall: function (methodName /*, ... */) {
     this._sendMessage("sync-call", arguments);
     let thread = this._Services.tm.currentThread;
     let initialReplies = this._repliesNeeded;
     // Need one more reply to answer the current sync call.
     this._repliesNeeded++;
     // Wait for the reply to arrive. Normally we would not want to
     // spin the event loop, but here we're in a test and our API
     // specifies a synchronous call, so we spin the loop to wait for
     // the call to finish.
     while (this._repliesNeeded > initialReplies) {
       thread.processNextEvent(true);
     }
   },
   /**
    * Asynchronously call a method in Java,
    * given the method name followed by a list of arguments.
    */
   asyncCall: function (methodName /*, ... */) {
     this._sendMessage("async-call", arguments);
   },
   /**
    * Disconnect with Java.
    */
   disconnect: function () {
     this._Services.obs.removeObserver(this, this._EVENT_TYPE);
   },
 };