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# assert [![Build Status](https://travis-ci.org/browserify/commonjs-assert.svg?branch=master)](https://travis-ci.org/browserify/commonjs-assert) This module is used for writing unit tests for your applications, you can access it with `require('assert')`. It aims to be fully compatibe with the [node.js assert module](http://nodejs.org/api/assert.html), same API and same behavior, just adding support for web browsers. The API and code may contain traces of the [CommonJS Unit Testing 1.0 spec](http://wiki.commonjs.org/wiki/Unit_Testing/1.0) which they were based on, but both have evolved significantly since then. A `strict` and a `legacy` mode exist, while it is recommended to only use `strict mode`. ## Strict mode When using the `strict mode`, any `assert` function will use the equality used in the strict function mode. So `assert.deepEqual()` will, for example, work the same as `assert.deepStrictEqual()`. It can be accessed using: ```js const assert = require('assert').strict; ``` ## Legacy mode > Deprecated: Use strict mode instead. When accessing `assert` directly instead of using the `strict` property, the [Abstract Equality Comparison](https://tc39.github.io/ecma262/#sec-abstract-equality-comparison) will be used for any function without a "strict" in its name (e.g. `assert.deepEqual()`). It can be accessed using: ```js const assert = require('assert'); ``` It is recommended to use the `strict mode` instead as the Abstract Equality Comparison can often have surprising results. Especially in case of `assert.deepEqual()` as the used comparison rules there are very lax. E.g. ```js // WARNING: This does not throw an AssertionError! assert.deepEqual(/a/gi, new Date()); ``` ## assert.fail(actual, expected, message, operator) Throws an exception that displays the values for actual and expected separated by the provided operator. ## assert(value, message), assert.ok(value, [message]) Tests if value is truthy, it is equivalent to assert.equal(true, !!value, message); ## assert.equal(actual, expected, [message]) Tests shallow, coercive equality with the equal comparison operator ( == ). ## assert.notEqual(actual, expected, [message]) Tests shallow, coercive non-equality with the not equal comparison operator ( != ). ## assert.deepEqual(actual, expected, [message]) Tests for deep equality. ## assert.deepStrictEqual(actual, expected, [message]) Tests for deep equality, as determined by the strict equality operator ( === ) ## assert.notDeepEqual(actual, expected, [message]) Tests for any deep inequality. ## assert.strictEqual(actual, expected, [message]) Tests strict equality, as determined by the strict equality operator ( === ) ## assert.notStrictEqual(actual, expected, [message]) Tests strict non-equality, as determined by the strict not equal operator ( !== ) ## assert.throws(block, [error], [message]) Expects block to throw an error. error can be constructor, regexp or validation function. Validate instanceof using constructor: ```javascript assert.throws(function() { throw new Error("Wrong value"); }, Error); ``` Validate error message using RegExp: ```javascript assert.throws(function() { throw new Error("Wrong value"); }, /value/); ``` Custom error validation: ```javascript assert.throws(function() { throw new Error("Wrong value"); }, function(err) { if ( (err instanceof Error) && /value/.test(err) ) { return true; } }, "unexpected error"); ``` ## assert.doesNotThrow(block, [message]) Expects block not to throw an error, see assert.throws for details. ## assert.ifError(value) Tests if value is not a false value, throws if it is a true value. Useful when testing the first argument, error in callbacks.