// http://wiki.commonjs.org/wiki/Unit_Testing/1.0

//

// THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!

//

// Originally from narwhal.js (http://narwhaljs.org)

// Copyright (c) 2009 Thomas Robinson <280north.com>

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the 'Software'), to

// deal in the Software without restriction, including without limitation the

// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

// sell copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in

// all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

// UTILITY

const util = require('util');

const pSlice = Array.prototype.slice;

// 1. The assert module provides functions that throw

// AssertionError's when particular conditions are not met. The

// assert module must conform to the following interface.

const assert = module.exports = ok;

// 2. The AssertionError is defined in assert.

// new assert.AssertionError({ message: message,

// actual: actual,

// expected: expected })

assert.AssertionError = function AssertionError(options) {

this.name = 'AssertionError';

this.actual = options.actual;

this.expected = options.expected;

this.operator = options.operator;

if (options.message) {

this.message = options.message;

this.generatedMessage = false;

} else {

this.message = getMessage(this);

this.generatedMessage = true;

}

var stackStartFunction = options.stackStartFunction || fail;

Error.captureStackTrace(this, stackStartFunction);

};

// assert.AssertionError instanceof Error

util.inherits(assert.AssertionError, Error);

function truncate(s, n) {

if (util.isString(s)) {

return s.length < n ? s : s.slice(0, n);

} else {

return s;

}

}

function getMessage(self) {

return truncate(util.inspect(self.actual), 128) + ' ' +

self.operator + ' ' +

truncate(util.inspect(self.expected), 128);

}

// At present only the three keys mentioned above are used and

// understood by the spec. Implementations or sub modules can pass

// other keys to the AssertionError's constructor - they will be

// ignored.

// 3. All of the following functions must throw an AssertionError

// when a corresponding condition is not met, with a message that

// may be undefined if not provided. All assertion methods provide

// both the actual and expected values to the assertion error for

// display purposes.

function fail(actual, expected, message, operator, stackStartFunction) {

throw new assert.AssertionError({

message: message,

actual: actual,

expected: expected,

operator: operator,

stackStartFunction: stackStartFunction

});

}

// EXTENSION! allows for well behaved errors defined elsewhere.

assert.fail = fail;

// 4. Pure assertion tests whether a value is truthy, as determined

// by !!guard.

// assert.ok(guard, message_opt);

// This statement is equivalent to assert.equal(true, !!guard,

// message_opt);. To test strictly for the value true, use

// assert.strictEqual(true, guard, message_opt);.

function ok(value, message) {

if (!value) fail(value, true, message, '==', assert.ok);

}

assert.ok = ok;

// 5. The equality assertion tests shallow, coercive equality with

// ==.

// assert.equal(actual, expected, message_opt);

assert.equal = function equal(actual, expected, message) {

if (actual != expected) fail(actual, expected, message, '==', assert.equal);

};

// 6. The non-equality assertion tests for whether two objects are not equal

// with != assert.notEqual(actual, expected, message_opt);

assert.notEqual = function notEqual(actual, expected, message) {

if (actual == expected) {

fail(actual, expected, message, '!=', assert.notEqual);

}

};

// 7. The equivalence assertion tests a deep equality relation.

// assert.deepEqual(actual, expected, message_opt);

assert.deepEqual = function deepEqual(actual, expected, message) {

if (!_deepEqual(actual, expected)) {

fail(actual, expected, message, 'deepEqual', assert.deepEqual);

}

};

function _deepEqual(actual, expected) {

// 7.1. All identical values are equivalent, as determined by ===.

if (actual === expected) {

return true;

} else if (util.isBuffer(actual) && util.isBuffer(expected)) {

if (actual.length != expected.length) return false;

for (var i = 0; i < actual.length; i++) {

if (actual[i] !== expected[i]) return false;

}

return true;

// 7.2. If the expected value is a Date object, the actual value is

// equivalent if it is also a Date object that refers to the same time.

} else if (util.isDate(actual) && util.isDate(expected)) {

return actual.getTime() === expected.getTime();

// 7.3 If the expected value is a RegExp object, the actual value is

// equivalent if it is also a RegExp object with the same source and

// properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).

} else if (util.isRegExp(actual) && util.isRegExp(expected)) {

return actual.source === expected.source &&

actual.global === expected.global &&

actual.multiline === expected.multiline &&

actual.lastIndex === expected.lastIndex &&

actual.ignoreCase === expected.ignoreCase;

// 7.4. Other pairs that do not both pass typeof value == 'object',

// equivalence is determined by ==.

} else if (!util.isObject(actual) && !util.isObject(expected)) {

return actual == expected;

// 7.5 For all other Object pairs, including Array objects, equivalence is

// determined by having the same number of owned properties (as verified

// with Object.prototype.hasOwnProperty.call), the same set of keys

// (although not necessarily the same order), equivalent values for every

// corresponding key, and an identical 'prototype' property. Note: this

// accounts for both named and indexed properties on Arrays.

} else {

return objEquiv(actual, expected);

}

}

function isArguments(object) {

return Object.prototype.toString.call(object) == '[object Arguments]';

}

function objEquiv(a, b) {

if (util.isNullOrUndefined(a) || util.isNullOrUndefined(b))

return false;

// an identical 'prototype' property.

if (a.prototype !== b.prototype) return false;

// if one is a primitive, the other must be same

if (util.isPrimitive(a) || util.isPrimitive(b))

return a === b;

var aIsArgs = isArguments(a),

bIsArgs = isArguments(b);

if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))

return false;

if (aIsArgs) {

a = pSlice.call(a);

b = pSlice.call(b);

return _deepEqual(a, b);

}

var ka = Object.keys(a),

kb = Object.keys(b),

key, i;

// having the same number of owned properties (keys incorporates

// hasOwnProperty)

if (ka.length != kb.length)

return false;

//the same set of keys (although not necessarily the same order),

ka.sort();

kb.sort();

//~~~cheap key test

for (i = ka.length - 1; i >= 0; i--) {

if (ka[i] != kb[i])

return false;

}

//equivalent values for every corresponding key, and

//~~~possibly expensive deep test

for (i = ka.length - 1; i >= 0; i--) {

key = ka[i];

if (!_deepEqual(a[key], b[key])) return false;

}

return true;

}

// 8. The non-equivalence assertion tests for any deep inequality.

// assert.notDeepEqual(actual, expected, message_opt);

assert.notDeepEqual = function notDeepEqual(actual, expected, message) {

if (_deepEqual(actual, expected)) {

fail(actual, expected, message, 'notDeepEqual', assert.notDeepEqual);

}

};

// 9. The strict equality assertion tests strict equality, as determined by ===.

// assert.strictEqual(actual, expected, message_opt);

assert.strictEqual = function strictEqual(actual, expected, message) {

if (actual !== expected) {

fail(actual, expected, message, '===', assert.strictEqual);

}

};

// 10. The strict non-equality assertion tests for strict inequality, as

// determined by !==. assert.notStrictEqual(actual, expected, message_opt);

assert.notStrictEqual = function notStrictEqual(actual, expected, message) {

if (actual === expected) {

fail(actual, expected, message, '!==', assert.notStrictEqual);

}

};

function expectedException(actual, expected) {

if (!actual || !expected) {

return false;

}

if (Object.prototype.toString.call(expected) == '[object RegExp]') {

return expected.test(actual);

} else if (actual instanceof expected) {

return true;

} else if (expected.call({}, actual) === true) {

return true;

}

return false;

}

function _throws(shouldThrow, block, expected, message) {

var actual;

if (!util.isFunction(block)) {

throw new TypeError('block must be a function');

}

if (util.isString(expected)) {

message = expected;

expected = null;

}

try {

block();

} catch (e) {

actual = e;

}

message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +

(message ? ' ' + message : '.');

if (shouldThrow && !actual) {

fail(actual, expected, 'Missing expected exception' + message);

}

if (!shouldThrow && expectedException(actual, expected)) {

fail(actual, expected, 'Got unwanted exception' + message);

}

if ((shouldThrow && actual && expected &&

!expectedException(actual, expected)) || (!shouldThrow && actual)) {

throw actual;

}

}

// 11. Expected to throw an error:

// assert.throws(block, Error_opt, message_opt);

assert.throws = function(block, /*optional*/error, /*optional*/message) {

_throws.apply(this, [true].concat(pSlice.call(arguments)));

};

// EXTENSION! This is annoying to write outside this module.

assert.doesNotThrow = function(block, /*optional*/message) {

_throws.apply(this, [false].concat(pSlice.call(arguments)));

};

assert.ifError = function(err) { if (err) {throw err;}};