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480 lines
15 KiB
JavaScript
480 lines
15 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
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// When you see a javadoc comment that contains a number, it's a reference to a
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// specific section of the CommonJS spec.
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//
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// Originally from narwhal.js (http://narwhaljs.org)
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// Copyright (c) 2009 Thomas Robinson <280north.com>
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// MIT license: http://opensource.org/licenses/MIT
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"use strict";
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this.EXPORTED_SYMBOLS = [
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"Assert"
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];
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Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "Promise",
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"resource://gre/modules/Promise.jsm");
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/**
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* 1. The assert module provides functions that throw AssertionError's when
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* particular conditions are not met.
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*
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* To use the module you'll need to instantiate it first, which allows consumers
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* to override certain behavior on the newly obtained instance. For examples,
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* see the javadoc comments for the `report` member function.
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*/
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let Assert = this.Assert = function(reporterFunc) {
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if (reporterFunc)
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this.setReporter(reporterFunc);
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};
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function instanceOf(object, type) {
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return Object.prototype.toString.call(object) == "[object " + type + "]";
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}
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function replacer(key, value) {
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if (value === undefined) {
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return "" + value;
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}
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if (typeof value === "number" && (isNaN(value) || !isFinite(value))) {
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return value.toString();
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}
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if (typeof value === "function" || instanceOf(value, "RegExp")) {
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return value.toString();
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}
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return value;
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}
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const kTruncateLength = 128;
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function truncate(text, newLength = kTruncateLength) {
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if (typeof text == "string") {
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return text.length < newLength ? text : text.slice(0, newLength);
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} else {
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return text;
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}
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}
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function getMessage(error, prefix = "") {
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let actual, expected;
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// Wrap calls to JSON.stringify in try...catch blocks, as they may throw. If
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// so, fall back to toString().
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try {
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actual = JSON.stringify(error.actual, replacer);
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} catch (ex) {
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actual = Object.prototype.toString.call(error.actual);
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}
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try {
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expected = JSON.stringify(error.expected, replacer);
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} catch (ex) {
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expected = Object.prototype.toString.call(error.expected);
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}
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let message = prefix;
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if (error.operator) {
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message += (prefix ? " - " : "") + truncate(actual) + " " + error.operator +
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" " + truncate(expected);
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}
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return message;
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}
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/**
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* 2. The AssertionError is defined in assert.
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*
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* Example:
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* new assert.AssertionError({
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* message: message,
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* actual: actual,
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* expected: expected,
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* operator: operator
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* });
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*
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* At present only the four keys mentioned above are used and
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* understood by the spec. Implementations or sub modules can pass
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* other keys to the AssertionError's constructor - they will be
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* ignored.
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*/
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Assert.AssertionError = function(options) {
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this.name = "AssertionError";
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this.actual = options.actual;
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this.expected = options.expected;
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this.operator = options.operator;
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this.message = getMessage(this, options.message);
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// The part of the stack that comes from this module is not interesting.
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let stack = Components.stack;
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do {
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stack = stack.caller;
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} while(stack.filename && stack.filename.contains("Assert.jsm"))
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this.stack = stack;
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};
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// assert.AssertionError instanceof Error
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Assert.AssertionError.prototype = Object.create(Error.prototype, {
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constructor: {
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value: Assert.AssertionError,
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enumerable: false,
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writable: true,
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configurable: true
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}
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});
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let proto = Assert.prototype;
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proto._reporter = null;
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/**
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* Set a custom assertion report handler function. Arguments passed in to this
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* function are:
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* err (AssertionError|null) An error object when the assertion failed or null
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* when it passed
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* message (string) Message describing the assertion
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* stack (stack) Stack trace of the assertion function
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*
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* Example:
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* ```js
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* Assert.setReporter(function customReporter(err, message, stack) {
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* if (err) {
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* do_report_result(false, err.message, err.stack);
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* } else {
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* do_report_result(true, message, stack);
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* }
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* });
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* ```
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*
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* @param reporterFunc
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* (function) Report handler function
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*/
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proto.setReporter = function(reporterFunc) {
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this._reporter = reporterFunc;
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};
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/**
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* 3. All of the following functions must throw an AssertionError when a
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* corresponding condition is not met, with a message that may be undefined if
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* not provided. All assertion methods provide both the actual and expected
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* values to the assertion error for display purposes.
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*
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* This report method only throws errors on assertion failures, as per spec,
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* but consumers of this module (think: xpcshell-test, mochitest) may want to
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* override this default implementation.
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*
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* Example:
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* ```js
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* // The following will report an assertion failure.
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* this.report(1 != 2, 1, 2, "testing JS number math!", "==");
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* ```
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*
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* @param failed
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* (boolean) Indicates if the assertion failed or not
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* @param actual
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* (mixed) The result of evaluating the assertion
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* @param expected (optional)
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* (mixed) Expected result from the test author
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* @param message (optional)
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* (string) Short explanation of the expected result
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* @param operator (optional)
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* (string) Operation qualifier used by the assertion method (ex: '==')
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*/
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proto.report = function(failed, actual, expected, message, operator) {
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let err = new Assert.AssertionError({
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message: message,
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actual: actual,
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expected: expected,
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operator: operator
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});
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if (!this._reporter) {
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// If no custom reporter is set, throw the error.
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if (failed) {
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throw err;
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}
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} else {
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this._reporter(failed ? err : null, err.message, err.stack);
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}
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};
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/**
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* 4. Pure assertion tests whether a value is truthy, as determined by !!guard.
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* assert.ok(guard, message_opt);
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* This statement is equivalent to assert.equal(true, !!guard, message_opt);.
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* To test strictly for the value true, use assert.strictEqual(true, guard,
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* message_opt);.
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*
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* @param value
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* (mixed) Test subject to be evaluated as truthy
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* @param message (optional)
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* (string) Short explanation of the expected result
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*/
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proto.ok = function(value, message) {
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this.report(!value, value, true, message, "==");
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};
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/**
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* 5. The equality assertion tests shallow, coercive equality with ==.
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* assert.equal(actual, expected, message_opt);
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*
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* @param actual
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* (mixed) Test subject to be evaluated as equivalent to `expected`
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* @param expected
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* (mixed) Test reference to evaluate against `actual`
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* @param message (optional)
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* (string) Short explanation of the expected result
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*/
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proto.equal = function equal(actual, expected, message) {
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this.report(actual != expected, actual, expected, message, "==");
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};
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/**
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* 6. The non-equality assertion tests for whether two objects are not equal
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* with != assert.notEqual(actual, expected, message_opt);
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*
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* @param actual
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* (mixed) Test subject to be evaluated as NOT equivalent to `expected`
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* @param expected
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* (mixed) Test reference to evaluate against `actual`
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* @param message (optional)
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* (string) Short explanation of the expected result
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*/
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proto.notEqual = function notEqual(actual, expected, message) {
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this.report(actual == expected, actual, expected, message, "!=");
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};
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/**
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* 7. The equivalence assertion tests a deep equality relation.
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* assert.deepEqual(actual, expected, message_opt);
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*
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* We check using the most exact approximation of equality between two objects
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* to keep the chance of false positives to a minimum.
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* `JSON.stringify` is not designed to be used for this purpose; objects may
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* have ambiguous `toJSON()` implementations that would influence the test.
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*
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* @param actual
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* (mixed) Test subject to be evaluated as equivalent to `expected`, including nested properties
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* @param expected
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* (mixed) Test reference to evaluate against `actual`
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* @param message (optional)
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* (string) Short explanation of the expected result
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*/
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proto.deepEqual = function deepEqual(actual, expected, message) {
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this.report(!_deepEqual(actual, expected), actual, expected, message, "deepEqual");
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};
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function _deepEqual(actual, expected) {
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// 7.1. All identical values are equivalent, as determined by ===.
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if (actual === expected) {
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return true;
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// 7.2. If the expected value is a Date object, the actual value is
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// equivalent if it is also a Date object that refers to the same time.
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} else if (instanceOf(actual, "Date") && instanceOf(expected, "Date")) {
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if (isNaN(actual.getTime()) && isNaN(expected.getTime()))
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return true;
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return actual.getTime() === expected.getTime();
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// 7.3 If the expected value is a RegExp object, the actual value is
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// equivalent if it is also a RegExp object with the same source and
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// properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).
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} else if (instanceOf(actual, "RegExp") && instanceOf(expected, "RegExp")) {
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return actual.source === expected.source &&
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actual.global === expected.global &&
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actual.multiline === expected.multiline &&
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actual.lastIndex === expected.lastIndex &&
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actual.ignoreCase === expected.ignoreCase;
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// 7.4. Other pairs that do not both pass typeof value == "object",
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// equivalence is determined by ==.
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} else if (typeof actual != "object" && typeof expected != "object") {
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return actual == expected;
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// 7.5 For all other Object pairs, including Array objects, equivalence is
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// determined by having the same number of owned properties (as verified
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// with Object.prototype.hasOwnProperty.call), the same set of keys
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// (although not necessarily the same order), equivalent values for every
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// corresponding key, and an identical 'prototype' property. Note: this
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// accounts for both named and indexed properties on Arrays.
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} else {
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return objEquiv(actual, expected);
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}
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}
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function isUndefinedOrNull(value) {
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return value === null || value === undefined;
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}
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function isArguments(object) {
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return instanceOf(object, "Arguments");
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}
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function objEquiv(a, b) {
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if (isUndefinedOrNull(a) || isUndefinedOrNull(b)) {
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return false;
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}
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// An identical 'prototype' property.
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if (a.prototype !== b.prototype) {
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return false;
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}
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// Object.keys may be broken through screwy arguments passing. Converting to
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// an array solves the problem.
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if (isArguments(a)) {
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if (!isArguments(b)) {
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return false;
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}
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a = pSlice.call(a);
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b = pSlice.call(b);
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return _deepEqual(a, b);
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}
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let ka, kb, key, i;
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try {
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ka = Object.keys(a);
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kb = Object.keys(b);
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} catch (e) {
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// Happens when one is a string literal and the other isn't
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return false;
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}
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// Having the same number of owned properties (keys incorporates
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// hasOwnProperty)
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if (ka.length != kb.length)
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return false;
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// The same set of keys (although not necessarily the same order),
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ka.sort();
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kb.sort();
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// Equivalent values for every corresponding key, and possibly expensive deep
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// test
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for (i = ka.length - 1; i >= 0; i--) {
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key = ka[i];
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if (!_deepEqual(a[key], b[key])) {
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return false;
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}
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}
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return true;
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}
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/**
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* 8. The non-equivalence assertion tests for any deep inequality.
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* assert.notDeepEqual(actual, expected, message_opt);
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*
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* @param actual
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* (mixed) Test subject to be evaluated as NOT equivalent to `expected`, including nested properties
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* @param expected
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* (mixed) Test reference to evaluate against `actual`
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* @param message (optional)
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* (string) Short explanation of the expected result
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*/
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proto.notDeepEqual = function notDeepEqual(actual, expected, message) {
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this.report(_deepEqual(actual, expected), actual, expected, message, "notDeepEqual");
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};
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/**
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* 9. The strict equality assertion tests strict equality, as determined by ===.
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* assert.strictEqual(actual, expected, message_opt);
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*
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* @param actual
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* (mixed) Test subject to be evaluated as strictly equivalent to `expected`
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* @param expected
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* (mixed) Test reference to evaluate against `actual`
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* @param message (optional)
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* (string) Short explanation of the expected result
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*/
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proto.strictEqual = function strictEqual(actual, expected, message) {
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this.report(actual !== expected, actual, expected, message, "===");
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};
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/**
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* 10. The strict non-equality assertion tests for strict inequality, as
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* determined by !==. assert.notStrictEqual(actual, expected, message_opt);
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*
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* @param actual
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* (mixed) Test subject to be evaluated as NOT strictly equivalent to `expected`
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* @param expected
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* (mixed) Test reference to evaluate against `actual`
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* @param message (optional)
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* (string) Short explanation of the expected result
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*/
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proto.notStrictEqual = function notStrictEqual(actual, expected, message) {
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this.report(actual === expected, actual, expected, message, "!==");
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};
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function expectedException(actual, expected) {
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if (!actual || !expected) {
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return false;
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}
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if (instanceOf(expected, "RegExp")) {
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return expected.test(actual);
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} else if (actual instanceof expected) {
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return true;
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} else if (expected.call({}, actual) === true) {
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return true;
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}
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return false;
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}
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/**
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* 11. Expected to throw an error:
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* assert.throws(block, Error_opt, message_opt);
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*
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* @param block
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* (function) Function block to evaluate and catch eventual thrown errors
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* @param expected (optional)
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* (mixed) Test reference to evaluate against the thrown result from `block`
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* @param message (optional)
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* (string) Short explanation of the expected result
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*/
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proto.throws = function(block, expected, message) {
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let actual;
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if (typeof expected === "string") {
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message = expected;
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expected = null;
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}
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try {
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block();
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} catch (e) {
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actual = e;
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}
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message = (expected && expected.name ? " (" + expected.name + ")." : ".") +
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(message ? " " + message : ".");
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if (!actual) {
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this.report(true, actual, expected, "Missing expected exception" + message);
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}
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if ((actual && expected && !expectedException(actual, expected))) {
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throw actual;
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}
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this.report(false, expected, expected, message);
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};
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/**
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* A promise that is expected to reject:
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* assert.rejects(promise, expected, message);
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*
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* @param promise
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* (promise) A promise that is expected to reject
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* @param expected (optional)
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* (mixed) Test reference to evaluate against the rejection result
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* @param message (optional)
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* (string) Short explanation of the expected result
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*/
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proto.rejects = function(promise, expected, message) {
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return new Promise((resolve, reject) => {
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if (typeof expected === "string") {
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message = expected;
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expected = null;
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}
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return promise.then(
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() => this.report(true, null, expected, "Missing expected exception " + message),
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err => {
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if (expected && !expectedException(err, expected)) {
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reject(err);
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return;
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}
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this.report(false, err, expected, message);
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resolve();
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}
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).then(null, reject);
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});
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};
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