474 lines
14 KiB
JavaScript
474 lines
14 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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Components.utils.import("resource://gre/modules/ObjectUtils.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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var 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.asyncCaller || stack.caller;
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} while(stack.filename && stack.filename.includes("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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var 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(!ObjectUtils.deepEqual(actual, expected), actual, expected, message, "deepEqual");
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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(ObjectUtils.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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function compareNumbers(expression, lhs, rhs, message, operator) {
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let lhsIsNumber = typeof lhs == "number";
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let rhsIsNumber = typeof rhs == "number";
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if (lhsIsNumber && rhsIsNumber) {
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this.report(expression, lhs, rhs, message, operator);
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return;
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}
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let errorMessage;
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if (!lhsIsNumber && !rhsIsNumber) {
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errorMessage = "Neither '" + lhs + "' nor '" + rhs + "' are numbers";
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} else {
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errorMessage = "'" + (lhsIsNumber ? rhs : lhs) + "' is not a number";
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}
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this.report(true, lhs, rhs, errorMessage);
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}
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/**
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* The lhs must be greater than the rhs.
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* assert.greater(lhs, rhs, message_opt);
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*
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* @param lhs
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* (number) The left-hand side value
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* @param rhs
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* (number) The right-hand side value
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* @param message (optional)
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* (string) Short explanation of the comparison result
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*/
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proto.greater = function greater(lhs, rhs, message) {
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compareNumbers.call(this, lhs <= rhs, lhs, rhs, message, ">");
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};
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/**
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* The lhs must be greater than or equal to the rhs.
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* assert.greaterOrEqual(lhs, rhs, message_opt);
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*
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* @param lhs
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* (number) The left-hand side value
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* @param rhs
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* (number) The right-hand side value
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* @param message (optional)
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* (string) Short explanation of the comparison result
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*/
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proto.greaterOrEqual = function greaterOrEqual(lhs, rhs, message) {
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compareNumbers.call(this, lhs < rhs, lhs, rhs, message, ">=");
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};
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/**
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* The lhs must be less than the rhs.
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* assert.less(lhs, rhs, message_opt);
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*
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* @param lhs
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* (number) The left-hand side value
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* @param rhs
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* (number) The right-hand side value
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* @param message (optional)
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* (string) Short explanation of the comparison result
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*/
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proto.less = function less(lhs, rhs, message) {
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compareNumbers.call(this, lhs >= rhs, lhs, rhs, message, "<");
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};
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/**
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* The lhs must be less than or equal to the rhs.
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* assert.lessOrEqual(lhs, rhs, message_opt);
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*
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* @param lhs
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* (number) The left-hand side value
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* @param rhs
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* (number) The right-hand side value
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* @param message (optional)
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* (string) Short explanation of the comparison result
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*/
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proto.lessOrEqual = function lessOrEqual(lhs, rhs, message) {
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compareNumbers.call(this, lhs > rhs, lhs, rhs, message, "<=");
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};
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