Extends Chai with assertions about promises. 

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chai-as-promised

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    // If we are using a version of Chai that has checkError on it,

    // we want to use that version to be consistent. Otherwise, we use

    function isLegacyJQueryPromise(thenable) {

        // jQuery promises are Promises/A+-compatible since 3.0.0. jQuery 3.0.0 is also the first version

        return typeof thenable.catch !== "function" &&

               typeof thenable.always === "function" &&

               typeof thenable.done === "function" &&

               typeof thenable.fail === "function" &&

               typeof thenable.pipe === "function" &&

               typeof thenable.progress === "function" &&

               typeof thenable.state === "function";

    function assertIsAboutPromise(assertion) {

        if (typeof assertion._obj.then !== "function") {

            throw new TypeError(utils.inspect(assertion._obj) + " is not a thenable.");

        if (isLegacyJQueryPromise(assertion._obj)) {

            throw new TypeError("Chai as Promised is incompatible with thenables of jQuery<3.0.0, sorry! Please " +

                                "upgrade jQuery or use another Promises/A+ compatible library (see " +

                                "http://promisesaplus.com/).");

    function proxifyIfSupported(assertion) {

        return proxify === undefined ? assertion : proxify(assertion);

        utils.addMethod(Assertion.prototype, name, function () {

            return asserter.apply(this, arguments);

        utils.addProperty(Assertion.prototype, name, function () {

            return proxifyIfSupported(asserter.apply(this, arguments));

        promise.then(() => done(), done);

    // These are for clarity and to bypass Chai refusing to allow `undefined` as actual when used with `assert`.

    function assertIfNegated(assertion, message, extra) {

        assertion.assert(true, null, message, extra.expected, extra.actual);

    function assertIfNotNegated(assertion, message, extra) {

        assertion.assert(false, message, null, extra.expected, extra.actual);

        // We need to chain subsequent asserters on top of ones in the chain already (consider

        // `eventually.have.property("foo").that.equals("bar")`), only running them after the existing ones pass.

        // So the first base-promise is `assertion._obj`, but after that we use the assertions themselves, i.e.

        // previously derived promises, to chain off of.

        return typeof assertion.then === "function" ? assertion : assertion._obj;

        return reason instanceof Error ? reason.toString() : checkError.getConstructorName(reason);

    // Grab these first, before we modify `Assertion.prototype`.

    const propertyNames = Object.getOwnPropertyNames(Assertion.prototype);

        propertyDescs[name] = Object.getOwnPropertyDescriptor(Assertion.prototype, name);

        const derivedPromise = getBasePromise(this).then(

                                "expected promise not to be fulfilled but it was fulfilled with #{act}",

                                { actual: value });

                                   "expected promise to be fulfilled but it was rejected with #{act}",

                                   { actual: getReasonName(reason) });

        module.exports.transferPromiseness(this, derivedPromise);

                                   "expected promise to be rejected but it was fulfilled with #{act}",

                                   { actual: value });

                                "expected promise not to be rejected but it was rejected with #{act}",

                                { actual: getReasonName(reason) });

                // Return the reason, transforming this into a fulfillment, to allow further assertions, e.g.

                // `promise.should.be.rejected.and.eventually.equal("reason")`.

    method("rejectedWith", function (errorLike, errMsgMatcher, message) {

        const negate = utils.flag(this, "negate") || false;

        // rejectedWith with that is called without arguments is

        // the same as a plain ".rejected" use.

        if (errorLike === undefined && errMsgMatcher === undefined &&

            /* eslint-disable no-unused-expressions */

            /* eslint-enable no-unused-expressions */

            utils.flag(this, "message", message);

        if (errorLike instanceof RegExp || typeof errorLike === "string") {

        } else if (errorLike && errorLike instanceof Error) {

            Assertion.overwriteProperty(getterName, originalGetter => function () {

                return doAsserterAsyncAndAddThen(originalGetter, this);

                return proxifyIfSupported(doAsserterAsyncAndAddThen(originalGetter, this));

    function doAsserterAsyncAndAddThen(asserter, assertion, args) {

        // Since we're intercepting all methods/properties, we need to just pass through if they don't want

        // `eventually`, or if we've already fulfilled the promise (see below).

        if (!utils.flag(assertion, "eventually")) {

            asserter.apply(assertion, args);

        const derivedPromise = getBasePromise(assertion).then(value => {

            // Set up the environment for the asserter to actually run: `_obj` should be the fulfillment value, and

            // now that we have the value, we're no longer in "eventually" mode, so we won't run any of this code,

            // just the base Chai code that we get to via the short-circuit above.

            utils.flag(assertion, "eventually", false);

            return args ? module.exports.transformAsserterArgs(args) : args;

            asserter.apply(assertion, newArgs);

            // Because asserters, for example `property`, can change the value of `_obj` (i.e. change the "object"

            // flag), we need to communicate this value change to subsequent chained asserters. Since we build a

            // promise chain paralleling the asserter chain, we can use it to communicate such changes.

        module.exports.transferPromiseness(assertion, derivedPromise);

    // ### Now use the `Assertion` framework to build an `assert` interface.

    const originalAssertMethods = Object.getOwnPropertyNames(assert).filter(propName => {

        return typeof assert[propName] === "function";

    assert.isFulfilled = (promise, message) => (new Assertion(promise, message)).to.be.fulfilled;

    assert.isRejected = (promise, errorLike, errMsgMatcher, message) => {

        const assertion = new Assertion(promise, message);

        return assertion.to.be.rejectedWith(errorLike, errMsgMatcher, message);

    assert.becomes = (promise, value, message) => assert.eventually.deepEqual(promise, value, message);

    assert.doesNotBecome = (promise, value, message) => assert.eventually.notDeepEqual(promise, value, message);

    originalAssertMethods.forEach(assertMethodName => {

        assert.eventually[assertMethodName] = function (promise) {

            const otherArgs = Array.prototype.slice.call(arguments, 1);

            const message = arguments[assert[assertMethodName].length - 1];

		@@ -14,3 +14,3 @@ {
		],
		"version": "7.0.0",
		"version": "7.1.0",
		"author": "Domenic Denicola <d@domenic.me> (https://domenic.me)",
		@@ -17,0 +17,0 @@ "license": "WTFPL",

		@@ -8,2 +8,3 @@ "use strict";
		const assert = chai.assert;
		const proxify = utils.proxify;

		@@ -40,2 +41,6 @@ // If we are using a version of Chai that has checkError on it,

		function proxifyIfSupported(assertion) {
		return proxify === undefined ? assertion : proxify(assertion);
		}

		function method(name, asserter) {
		@@ -51,3 +56,3 @@ utils.addMethod(Assertion.prototype, name, function () {
		assertIsAboutPromise(this);
		return asserter.apply(this, arguments);
		return proxifyIfSupported(asserter.apply(this, arguments));
		});
		@@ -278,3 +283,3 @@ }
		Assertion.overwriteProperty(getterName, originalGetter => function () {
		return doAsserterAsyncAndAddThen(originalGetter, this);
		return proxifyIfSupported(doAsserterAsyncAndAddThen(originalGetter, this));
		});
		@@ -281,0 +286,0 @@ }

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