BDD/TDD assertion library for node.js and the browser. Test framework agnostic. 

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import {AssertionError} from 'assertion-error';

import * as util from './utils/index.js';

 * `Assertion` objects contain metadata in the form of flags. Three flags can

 * be assigned during instantiation by passing arguments to this constructor:

 * - `object`: This flag contains the target of the assertion. For example, in

 *   the assertion `expect(numKittens).to.equal(7);`, the `object` flag will

 *   contain `numKittens` so that the `equal` assertion can reference it when

 * - `message`: This flag contains an optional custom error message to be

 *   prepended to the error message that's generated by the assertion when it

 * - `ssfi`: This flag stands for "start stack function indicator". It

 *   contains a function reference that serves as the starting point for

 *   removing frames from the stack trace of the error that's created by the

 *   assertion when it fails. The goal is to provide a cleaner stack trace to

 *   end users by removing Chai's internal functions. Note that it only works

 *   in environments that support `Error.captureStackTrace`, and only when

 *   `Chai.config.includeStack` hasn't been set to `false`.

 * - `lockSsfi`: This flag controls whether or not the given `ssfi` flag

 *   should retain its current value, even as assertions are chained off of

 *   this object. This is usually set to `true` when creating a new assertion

 *   from within another assertion. It's also temporarily set to `true` before

 *   an overwritten assertion gets called by the overwriting assertion.

 * - `eql`: This flag contains the deepEqual function to be used by the assertion.

 * @param {Mixed} obj target of the assertion

 * @param {String} msg (optional) custom error message

 * @param {Function} ssfi (optional) starting point for removing stack frames

 * @param {Boolean} lockSsfi (optional) whether or not the ssfi flag is locked

export function Assertion (obj, msg, ssfi, lockSsfi) {

  util.flag(this, 'ssfi', ssfi || Assertion);

  util.flag(this, 'eql', config.deepEqual ?? util.eql);

Object.defineProperty(Assertion, 'includeStack', {

    console.warn('Assertion.includeStack is deprecated, use chai.config.includeStack instead.');

Object.defineProperty(Assertion, 'showDiff', {

    console.warn('Assertion.showDiff is deprecated, use chai.config.showDiff instead.');

Assertion.addProperty = function (name, fn) {

  util.addProperty(this.prototype, name, fn);

Assertion.addMethod = function (name, fn) {

  util.addMethod(this.prototype, name, fn);

Assertion.addChainableMethod = function (name, fn, chainingBehavior) {

  util.addChainableMethod(this.prototype, name, fn, chainingBehavior);

Assertion.overwriteProperty = function (name, fn) {

  util.overwriteProperty(this.prototype, name, fn);

Assertion.overwriteMethod = function (name, fn) {

  util.overwriteMethod(this.prototype, name, fn);

Assertion.overwriteChainableMethod = function (name, fn, chainingBehavior) {

  util.overwriteChainableMethod(this.prototype, name, fn, chainingBehavior);

 * ### .assert(expression, message, negateMessage, expected, actual, showDiff)

 * Executes an expression and check expectations. Throws AssertionError for reporting if test doesn't pass.

 * @param {Philosophical} expression to be tested

 * @param {String|Function} message or function that returns message to display if expression fails

 * @param {String|Function} negatedMessage or function that returns negatedMessage to display if negated expression fails

 * @param {Mixed} expected value (remember to check for negation)

 * @param {Mixed} actual (optional) will default to `this.obj`

 * @param {Boolean} showDiff (optional) when set to `true`, assert will display a diff in addition to the message if expression fails

Assertion.prototype.assert = function (expr, msg, negateMsg, expected, _actual, showDiff) {

  if (false !== showDiff) showDiff = true;

  if (undefined === expected && undefined === _actual) showDiff = false;

  if (true !== config.showDiff) showDiff = false;

    msg = util.getMessage(this, arguments);

    var actual = util.getActual(this, arguments);

    var assertionErrorObjectProperties = {

    var operator = util.getOperator(this, arguments);

      assertionErrorObjectProperties.operator = operator;

      (config.includeStack) ? this.assert : util.flag(this, 'ssfi'));

 * Quick reference to stored `actual` value for plugin developers.

Object.defineProperty(Assertion.prototype, '_obj',

   * User configurable property, influences whether stack trace

   * is included in Assertion error message. Default of false

   * suppresses stack trace in the error message.

   *     chai.config.includeStack = true;  // enable stack on error

   * User configurable property, influences whether or not

   * the `showDiff` flag should be included in the thrown

   * AssertionErrors. `false` will always be `false`; `true`

   * will be true when the assertion has requested a diff

   * User configurable property, sets length threshold for actual and

   * expected values in assertion errors. If this threshold is exceeded, for

   * example for large data structures, the value is replaced with something

   * like `[ Array(3) ]` or `{ Object (prop1, prop2) }`.

   * Set it to zero if you want to disable truncating altogether.

   * This is especially userful when doing assertions on arrays: having this

   * set to a reasonable large value makes the failure messages readily

   *     chai.config.truncateThreshold = 0;  // disable truncating

   * User configurable property, defines if chai will use a Proxy to throw

   * an error when a non-existent property is read, which protects users

   * from typos when using property-based assertions.

   * Set it to false if you want to disable this feature.

   *     chai.config.useProxy = false;  // disable use of Proxy

   * This feature is automatically disabled regardless of this config value

   * in environments that don't support proxies.

   * User configurable property, defines which properties should be ignored

   * instead of throwing an error if they do not exist on the assertion.

   * This is only applied if the environment Chai is running in supports proxies and

   * if the `useProxy` configuration setting is enabled.

		@@ -43,2 +43,4 @@ /*!
		*
		* - `eql`: This flag contains the deepEqual function to be used by the assertion.
		*
		* @param {Mixed} obj target of the assertion
		@@ -56,2 +58,3 @@ * @param {String} msg (optional) custom error message
		util.flag(this, 'message', msg);
		util.flag(this, 'eql', config.deepEqual ?? util.eql);

		@@ -58,0 +61,0 @@ return util.proxify(this);

		@@ -93,3 +93,29 @@ export const config = {

		proxyExcludedKeys: ['then', 'catch', 'inspect', 'toJSON']
		proxyExcludedKeys: ['then', 'catch', 'inspect', 'toJSON'],

		/**
		* ### config.deepEqual
		*
		* User configurable property, defines which a custom function to use for deepEqual
		* comparisons.
		* By default, the function used is the one from the `deep-eql` package without custom comparator.
		*
		* // use a custom comparator
		* chai.config.deepEqual = (expected, actual) => {
		* return chai.util.eql(expected, actual, {
		* comparator: (expected, actual) => {
		* // for non number comparison, use the default behavior
		* if(typeof expected !== 'number') return null;
		* // allow a difference of 10 between compared numbers
		* return typeof actual === 'number' && Math.abs(actual - expected) < 10
		* }
		* })
		* };
		*
		* @param {Function}
		* @api public
		*/

		deepEqual: null

		};

		@@ -21,3 +21,3 @@ {
		],
		"version": "5.0.0-rc.0",
		"version": "5.0.0",
		"repository": {
		@@ -24,0 +24,0 @@ "type": "git",

Fixed alerts

Improved metrics