diff -r 000000000000 -r 6474c204b198 testing/modules/Assert.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/modules/Assert.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,442 @@
+/* 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/. */
+
+// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
+// When you see a javadoc comment that contains a number, it's a reference to a
+// specific section of the CommonJS spec.
+//
+// Originally from narwhal.js (http://narwhaljs.org)
+// Copyright (c) 2009 Thomas Robinson <280north.com>
+// MIT license: http://opensource.org/licenses/MIT
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = [
+  "Assert"
+];
+
+/**
+ * 1. The assert module provides functions that throw AssertionError's when
+ * particular conditions are not met.
+ *
+ * To use the module you'll need to instantiate it first, which allows consumers
+ * to override certain behavior on the newly obtained instance. For examples,
+ * see the javadoc comments for the `report` member function.
+ */
+let Assert = this.Assert = function(reporterFunc) {
+  if (reporterFunc)
+    this.setReporter(reporterFunc);
+};
+
+function instanceOf(object, type) {
+  return Object.prototype.toString.call(object) == "[object " + type + "]";
+}
+
+function replacer(key, value) {
+  if (value === undefined) {
+    return "" + value;
+  }
+  if (typeof value === "number" && (isNaN(value) || !isFinite(value))) {
+    return value.toString();
+  }
+  if (typeof value === "function" || instanceOf(value, "RegExp")) {
+    return value.toString();
+  }
+  return value;
+}
+
+const kTruncateLength = 128;
+
+function truncate(text, newLength = kTruncateLength) {
+  if (typeof text == "string") {
+    return text.length < newLength ? text : text.slice(0, newLength);
+  } else {
+    return text;
+  }
+}
+
+function getMessage(error, prefix = "") {
+  let actual, expected;
+  // Wrap calls to JSON.stringify in try...catch blocks, as they may throw. If
+  // so, fall back to toString().
+  try {
+    actual = JSON.stringify(error.actual, replacer);
+  } catch (ex) {
+    actual = Object.prototype.toString.call(error.actual);
+  }
+  try {
+    expected = JSON.stringify(error.expected, replacer);
+  } catch (ex) {
+    expected = Object.prototype.toString.call(error.expected);
+  }
+  let message = prefix;
+  if (error.operator) {
+    message += (prefix ? " - " : "") + truncate(actual) + " " + error.operator +
+               " " + truncate(expected);
+  }
+  return message;
+}
+
+/**
+ * 2. The AssertionError is defined in assert.
+ *
+ * Example:
+ * new assert.AssertionError({
+ *   message: message,
+ *   actual: actual,
+ *   expected: expected,
+ *   operator: operator
+ * });
+ *
+ * At present only the four keys mentioned above are used and
+ * understood by the spec. Implementations or sub modules can pass
+ * other keys to the AssertionError's constructor - they will be
+ * ignored.
+ */
+Assert.AssertionError = function(options) {
+  this.name = "AssertionError";
+  this.actual = options.actual;
+  this.expected = options.expected;
+  this.operator = options.operator;
+  this.message = getMessage(this, options.message);
+  // The part of the stack that comes from this module is not interesting.
+  let stack = Components.stack;
+  do {
+    stack = stack.caller;
+  } while(stack.filename && stack.filename.contains("Assert.jsm"))
+  this.stack = stack;
+};
+
+// assert.AssertionError instanceof Error
+Assert.AssertionError.prototype = Object.create(Error.prototype, {
+  constructor: {
+    value: Assert.AssertionError,
+    enumerable: false,
+    writable: true,
+    configurable: true
+  }
+});
+
+let proto = Assert.prototype;
+
+proto._reporter = null;
+/**
+ * Set a custom assertion report handler function. Arguments passed in to this
+ * function are:
+ * err (AssertionError|null) An error object when the assertion failed or null
+ *                           when it passed
+ * message (string) Message describing the assertion
+ * stack (stack) Stack trace of the assertion function
+ *
+ * Example:
+ * ```js
+ * Assert.setReporter(function customReporter(err, message, stack) {
+ *   if (err) {
+ *     do_report_result(false, err.message, err.stack);
+ *   } else {
+ *     do_report_result(true, message, stack);
+ *   }
+ * });
+ * ```
+ *
+ * @param reporterFunc
+ *        (function) Report handler function
+ */
+proto.setReporter = function(reporterFunc) {
+  this._reporter = reporterFunc;
+};
+
+/**
+ * 3. All of the following functions must throw an AssertionError when a
+ * corresponding condition is not met, with a message that may be undefined if
+ * not provided.  All assertion methods provide both the actual and expected
+ * values to the assertion error for display purposes.
+ *
+ * This report method only throws errors on assertion failures, as per spec,
+ * but consumers of this module (think: xpcshell-test, mochitest) may want to
+ * override this default implementation.
+ *
+ * Example:
+ * ```js
+ * // The following will report an assertion failure.
+ * this.report(1 != 2, 1, 2, "testing JS number math!", "==");
+ * ```
+ *
+ * @param failed
+ *        (boolean) Indicates if the assertion failed or not
+ * @param actual
+ *        (mixed) The result of evaluating the assertion
+ * @param expected (optional)
+ *        (mixed) Expected result from the test author
+ * @param message (optional)
+ *        (string) Short explanation of the expected result
+ * @param operator (optional)
+ *        (string) Operation qualifier used by the assertion method (ex: '==')
+ */
+proto.report = function(failed, actual, expected, message, operator) {
+  let err = new Assert.AssertionError({
+    message: message,
+    actual: actual,
+    expected: expected,
+    operator: operator
+  });
+  if (!this._reporter) {
+    // If no custom reporter is set, throw the error.
+    if (failed) {
+      throw err;
+    }
+  } else {
+    this._reporter(failed ? err : null, message, err.stack);
+  }
+};
+
+/**
+ * 4. Pure assertion tests whether a value is truthy, as determined by !!guard.
+ * assert.ok(guard, message_opt);
+ * This statement is equivalent to assert.equal(true, !!guard, message_opt);.
+ * To test strictly for the value true, use assert.strictEqual(true, guard,
+ * message_opt);.
+ *
+ * @param value
+ *        (mixed) Test subject to be evaluated as truthy
+ * @param message (optional)
+ *        (string) Short explanation of the expected result
+ */
+proto.ok = function(value, message) {
+  this.report(!value, value, true, message, "==");
+};
+
+/**
+ * 5. The equality assertion tests shallow, coercive equality with ==.
+ * assert.equal(actual, expected, message_opt);
+ *
+ * @param actual
+ *        (mixed) Test subject to be evaluated as equivalent to `expected`
+ * @param expected
+ *        (mixed) Test reference to evaluate against `actual`
+ * @param message (optional)
+ *        (string) Short explanation of the expected result
+ */
+proto.equal = function equal(actual, expected, message) {
+  this.report(actual != expected, actual, expected, message, "==");
+};
+
+/**
+ * 6. The non-equality assertion tests for whether two objects are not equal
+ * with != assert.notEqual(actual, expected, message_opt);
+ *
+ * @param actual
+ *        (mixed) Test subject to be evaluated as NOT equivalent to `expected`
+ * @param expected
+ *        (mixed) Test reference to evaluate against `actual`
+ * @param message (optional)
+ *        (string) Short explanation of the expected result
+ */
+proto.notEqual = function notEqual(actual, expected, message) {
+  this.report(actual == expected, actual, expected, message, "!=");
+};
+
+/**
+ * 7. The equivalence assertion tests a deep equality relation.
+ * assert.deepEqual(actual, expected, message_opt);
+ *
+ * We check using the most exact approximation of equality between two objects
+ * to keep the chance of false positives to a minimum.
+ * `JSON.stringify` is not designed to be used for this purpose; objects may
+ * have ambiguous `toJSON()` implementations that would influence the test.
+ *
+ * @param actual
+ *        (mixed) Test subject to be evaluated as equivalent to `expected`, including nested properties
+ * @param expected
+ *        (mixed) Test reference to evaluate against `actual`
+ * @param message (optional)
+ *        (string) Short explanation of the expected result
+ */
+proto.deepEqual = function deepEqual(actual, expected, message) {
+  this.report(!_deepEqual(actual, expected), actual, expected, message, "deepEqual");
+};
+
+function _deepEqual(actual, expected) {
+  // 7.1. All identical values are equivalent, as determined by ===.
+  if (actual === expected) {
+    return true;
+  // 7.2. If the expected value is a Date object, the actual value is
+  // equivalent if it is also a Date object that refers to the same time.
+  } else if (instanceOf(actual, "Date") && instanceOf(expected, "Date")) {
+    return actual.getTime() === expected.getTime();
+  // 7.3 If the expected value is a RegExp object, the actual value is
+  // equivalent if it is also a RegExp object with the same source and
+  // properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).
+  } else if (instanceOf(actual, "RegExp") && instanceOf(expected, "RegExp")) {
+    return actual.source === expected.source &&
+           actual.global === expected.global &&
+           actual.multiline === expected.multiline &&
+           actual.lastIndex === expected.lastIndex &&
+           actual.ignoreCase === expected.ignoreCase;
+  // 7.4. Other pairs that do not both pass typeof value == "object",
+  // equivalence is determined by ==.
+  } else if (typeof actual != "object" && typeof expected != "object") {
+    return actual == expected;
+  // 7.5 For all other Object pairs, including Array objects, equivalence is
+  // determined by having the same number of owned properties (as verified
+  // with Object.prototype.hasOwnProperty.call), the same set of keys
+  // (although not necessarily the same order), equivalent values for every
+  // corresponding key, and an identical 'prototype' property. Note: this
+  // accounts for both named and indexed properties on Arrays.
+  } else {
+    return objEquiv(actual, expected);
+  }
+}
+
+function isUndefinedOrNull(value) {
+  return value === null || value === undefined;
+}
+
+function isArguments(object) {
+  return instanceOf(object, "Arguments");
+}
+
+function objEquiv(a, b) {
+  if (isUndefinedOrNull(a) || isUndefinedOrNull(b)) {
+    return false;
+  }
+  // An identical 'prototype' property.
+  if (a.prototype !== b.prototype) {
+    return false;
+  }
+  // Object.keys may be broken through screwy arguments passing. Converting to
+  // an array solves the problem.
+  if (isArguments(a)) {
+    if (!isArguments(b)) {
+      return false;
+    }
+    a = pSlice.call(a);
+    b = pSlice.call(b);
+    return _deepEqual(a, b);
+  }
+  let ka, kb, key, i;
+  try {
+    ka = Object.keys(a);
+    kb = Object.keys(b);
+  } catch (e) {
+    // Happens when one is a string literal and the other isn't
+    return false;
+  }
+  // Having the same number of owned properties (keys incorporates
+  // hasOwnProperty)
+  if (ka.length != kb.length)
+    return false;
+  // The same set of keys (although not necessarily the same order),
+  ka.sort();
+  kb.sort();
+  // Equivalent values for every corresponding key, and possibly expensive deep 
+  // test
+  for (i = ka.length - 1; i >= 0; i--) {
+    key = ka[i];
+    if (!_deepEqual(a[key], b[key])) {
+      return false;
+    }
+  }
+  return true;
+}
+
+/**
+ * 8. The non-equivalence assertion tests for any deep inequality.
+ * assert.notDeepEqual(actual, expected, message_opt);
+ *
+ * @param actual
+ *        (mixed) Test subject to be evaluated as NOT equivalent to `expected`, including nested properties
+ * @param expected
+ *        (mixed) Test reference to evaluate against `actual`
+ * @param message (optional)
+ *        (string) Short explanation of the expected result
+ */
+proto.notDeepEqual = function notDeepEqual(actual, expected, message) {
+  this.report(_deepEqual(actual, expected), actual, expected, message, "notDeepEqual");
+};
+
+/**
+ * 9. The strict equality assertion tests strict equality, as determined by ===.
+ * assert.strictEqual(actual, expected, message_opt);
+ *
+ * @param actual
+ *        (mixed) Test subject to be evaluated as strictly equivalent to `expected`
+ * @param expected
+ *        (mixed) Test reference to evaluate against `actual`
+ * @param message (optional)
+ *        (string) Short explanation of the expected result
+ */
+proto.strictEqual = function strictEqual(actual, expected, message) {
+  this.report(actual !== expected, actual, expected, message, "===");
+};
+
+/**
+ * 10. The strict non-equality assertion tests for strict inequality, as
+ * determined by !==.  assert.notStrictEqual(actual, expected, message_opt);
+ *
+ * @param actual
+ *        (mixed) Test subject to be evaluated as NOT strictly equivalent to `expected`
+ * @param expected
+ *        (mixed) Test reference to evaluate against `actual`
+ * @param message (optional)
+ *        (string) Short explanation of the expected result
+ */
+proto.notStrictEqual = function notStrictEqual(actual, expected, message) {
+  this.report(actual === expected, actual, expected, message, "!==");
+};
+
+function expectedException(actual, expected) {
+  if (!actual || !expected) {
+    return false;
+  }
+
+  if (instanceOf(expected, "RegExp")) {
+    return expected.test(actual);
+  } else if (actual instanceof expected) {
+    return true;
+  } else if (expected.call({}, actual) === true) {
+    return true;
+  }
+
+  return false;
+}
+
+/**
+ * 11. Expected to throw an error:
+ * assert.throws(block, Error_opt, message_opt);
+ *
+ * @param block
+ *        (function) Function block to evaluate and catch eventual thrown errors
+ * @param expected (optional)
+ *        (mixed) Test reference to evaluate against the thrown result from `block`
+ * @param message (optional)
+ *        (string) Short explanation of the expected result
+ */
+proto.throws = function(block, expected, message) {
+  let actual;
+
+  if (typeof expected === "string") {
+    message = expected;
+    expected = null;
+  }
+
+  try {
+    block();
+  } catch (e) {
+    actual = e;
+  }
+
+  message = (expected && expected.name ? " (" + expected.name + ")." : ".") +
+            (message ? " " + message : ".");
+
+  if (!actual) {
+    this.report(true, actual, expected, "Missing expected exception" + message);
+  }
+
+  if ((actual && expected && !expectedException(actual, expected))) {
+    throw actual;
+  }
+
+  this.report(false, expected, expected, message);
+};