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commonjs assert module. thanks node!
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vendor/assert.js
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325
vendor/assert.js
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// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
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//
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// THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
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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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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the 'Software'), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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// UTILITY
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// var util = require('util');
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var pSlice = Array.prototype.slice;
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// 1. The assert module provides functions that throw
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// AssertionError's when particular conditions are not met. The
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// assert module must conform to the following interface.
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var assert = exports;
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// 2. The AssertionError is defined in assert.
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// new assert.AssertionError({ message: message,
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// actual: actual,
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// expected: expected })
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assert.AssertionError = function AssertionError(options) {
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this.name = 'AssertionError';
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this.message = options.message;
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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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var stackStartFunction = options.stackStartFunction || fail;
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if (Error.captureStackTrace) {
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Error.captureStackTrace(this, stackStartFunction);
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}
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};
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// util.inherits(assert.AssertionError, Error);
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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' || value instanceof 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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function truncate(s, n) {
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if (typeof s == 'string') {
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return s.length < n ? s : s.slice(0, n);
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} else {
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return s;
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}
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}
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assert.AssertionError.prototype.toString = function() {
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if (this.message) {
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return [ this.name + ':', this.message ].join(' ');
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} else {
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return [
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this.name + ':',
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truncate(JSON.stringify(this.actual, replacer), 128),
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this.operator,
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truncate(JSON.stringify(this.expected, replacer), 128)
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].join(' ');
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}
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};
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// assert.AssertionError instanceof Error
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assert.AssertionError.__proto__ = Error.prototype;
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// At present only the three 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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// 3. All of the following functions must throw an AssertionError
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// when a corresponding condition is not met, with a message that
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// may be undefined if not provided. All assertion methods provide
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// both the actual and expected values to the assertion error for
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// display purposes.
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function fail(actual, expected, message, operator, stackStartFunction) {
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throw 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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stackStartFunction: stackStartFunction
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});
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}
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// EXTENSION! allows for well behaved errors defined elsewhere.
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assert.fail = fail;
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// 4. Pure assertion tests whether a value is truthy, as determined
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// by !!guard.
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// assert.ok(guard, message_opt);
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// This statement is equivalent to assert.equal(true, guard,
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// message_opt);. To test strictly for the value true, use
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// assert.strictEqual(true, guard, message_opt);.
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assert.ok = function ok(value, message) {
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if (!!!value) fail(value, true, message, '==', assert.ok);
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};
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// 5. The equality assertion tests shallow, coercive equality with
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// ==.
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// assert.equal(actual, expected, message_opt);
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assert.equal = function equal(actual, expected, message) {
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if (actual != expected) fail(actual, expected, message, '==', assert.equal);
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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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assert.notEqual = function notEqual(actual, expected, message) {
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if (actual == expected) {
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fail(actual, expected, message, '!=', assert.notEqual);
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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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assert.deepEqual = function deepEqual(actual, expected, message) {
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if (!_deepEqual(actual, expected)) {
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fail(actual, expected, message, 'deepEqual', assert.deepEqual);
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}
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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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} else if (Buffer.isBuffer(actual) && Buffer.isBuffer(expected)) {
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if (actual.length != expected.length) return false;
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for (var i = 0; i < actual.length; i++) {
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if (actual[i] !== expected[i]) return false;
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}
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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 (actual instanceof Date && expected instanceof Date) {
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return actual.getTime() === expected.getTime();
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// 7.3. 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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// 7.4. 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 Object.prototype.toString.call(object) == '[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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// an identical 'prototype' property.
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if (a.prototype !== b.prototype) return false;
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//~~~I've managed to break Object.keys through screwy arguments passing.
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// Converting to 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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try {
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var ka = Object.keys(a),
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kb = Object.keys(b),
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key, i;
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} catch (e) {//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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//~~~cheap key test
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for (i = ka.length - 1; i >= 0; i--) {
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if (ka[i] != kb[i])
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return false;
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}
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//equivalent values for every corresponding key, and
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//~~~possibly expensive deep 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])) return false;
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}
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return true;
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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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assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
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if (_deepEqual(actual, expected)) {
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fail(actual, expected, message, 'notDeepEqual', assert.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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assert.strictEqual = function strictEqual(actual, expected, message) {
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if (actual !== expected) {
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fail(actual, expected, message, '===', assert.strictEqual);
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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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assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
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if (actual === expected) {
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fail(actual, expected, message, '!==', assert.notStrictEqual);
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}
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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 (expected instanceof 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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function _throws(shouldThrow, block, expected, message) {
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var 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 (shouldThrow && !actual) {
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fail('Missing expected exception' + message);
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}
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if (!shouldThrow && expectedException(actual, expected)) {
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fail('Got unwanted exception' + message);
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}
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if ((shouldThrow && actual && expected &&
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!expectedException(actual, expected)) || (!shouldThrow && actual)) {
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throw actual;
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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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assert.throws = function(block, /*optional*/error, /*optional*/message) {
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_throws.apply(this, [true].concat(pSlice.call(arguments)));
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};
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// EXTENSION! This is annoying to write outside this module.
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assert.doesNotThrow = function(block, /*optional*/error, /*optional*/message) {
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_throws.apply(this, [false].concat(pSlice.call(arguments)));
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};
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assert.ifError = function(err) { if (err) {throw err;}};
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