node-bluebird/test/mocha/nodeify.js

"use strict";
var assert = require("assert");
var testUtils = require("./helpers/util.js");
var awaitGlobalException = testUtils.awaitGlobalException;
var sinon = require("sinon");
var isNodeJS = testUtils.isNodeJS;
/*
Copyright 2009–2012 Kristopher Michael Kowal. All rights reserved.
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 OR COPYRIGHT HOLDERS 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.
*/

describe("nodeify", function () {

    it("calls back with a resolution", function () {
        var spy = sinon.spy();
        Promise.resolve(10).nodeify(spy);
        setTimeout(function(){
            sinon.assert.calledOnce(spy);
            sinon.assert.calledWith(spy, null, 10);
        }, 1);
    });

    it("calls back with an undefined resolution", function() {
        var spy = sinon.spy();
        Promise.resolve().nodeify(spy);
        setTimeout(function(){
            sinon.assert.calledOnce(spy);
            sinon.assert.calledWithExactly(spy, null);
        }, 1);
    });

    it("calls back with an error", function () {
        var spy = sinon.spy();
        Promise.reject(10).nodeify(spy);
        setTimeout(function(){
            sinon.assert.calledOnce(spy);
            sinon.assert.calledWith(spy, 10);
        }, 1);
    });

    it("forwards a promise", function () {
        return Promise.resolve(10).nodeify().then(function (ten) {
            assert(10 === ten);
        });
    });

    it("returns undefined when a callback is passed", function () {
        return 'undefined' === typeof Promise.resolve(10).nodeify(function () {});
    });

});
var getSpy = testUtils.getSpy;
if (isNodeJS) {
    describe("nodeify", function () {
        var h = [];
        var e = new Error();
        function thrower() {
            throw e;
        }

        it("throws normally in the node process if the function throws", function() {
            var promise = Promise.resolve(10);
            var turns = 0;
            process.nextTick(function(){
                turns++;
            });
            promise.nodeify(thrower);
            return awaitGlobalException(function(err) {
                assert(err === e);
                assert(turns === 1);
            });
        });

        it("always returns promise for now", function() {
            return Promise.resolve(3).nodeify().then(function() {
                var a = 0;
                Promise.resolve(3).nodeify(function(){
                    a++;
                }).then(function() {
                    assert(1 == 1);
                });
            });
        });

        it("should spread arguments with spread option", function() {
            var spy = getSpy();
            Promise.resolve([1,2,3]).nodeify(spy(function(err, a, b, c) {
                assert(err === null);
                assert(a === 1);
                assert(b === 2);
                assert(c === 3);
            }), {spread: true});
            return spy.promise;
        });

        describe("promise rejected with falsy values", function() {
            specify("no reason", function() {
                var spy = getSpy();
                Promise.reject().nodeify(spy(function(err) {
                    assert.strictEqual(arguments.length, 1);
                    assert.strictEqual(err.cause, undefined);
                }));
                return spy.promise;
            });
            specify("null reason", function() {
                var spy = getSpy();
                Promise.reject(null).nodeify(spy(function(err) {
                    assert.strictEqual(arguments.length, 1);
                    assert.strictEqual(err.cause, null);
                }));
                return spy.promise;
            });
            specify("nodefying a follewer promise", function() {
                var spy = getSpy();
                new Promise(function(resolve, reject) {
                    resolve(new Promise(function(_, reject) {
                        setTimeout(function() {
                            reject();
                        }, 1);
                    }))
                }).nodeify(spy(function(err) {
                    assert.strictEqual(arguments.length, 1);
                    assert.strictEqual(err.cause, undefined);
                }));
                return spy.promise;
            });
            specify("nodefier promise becomes follower", function() {
                var spy = getSpy();
                Promise.resolve(1).then(function() {
                    return new Promise(function(_, reject) {
                        setTimeout(function() {
                            reject();
                        }, 1);
                    });
                }).nodeify(spy(function(err) {
                    assert.strictEqual(arguments.length, 1);
                    assert.strictEqual(err.cause, undefined);
                }));
                return spy.promise;
            });
        });
        it("should wrap arguments with spread option", function() {
            var spy = getSpy();
            Promise.resolve([1,2,3]).nodeify(spy(function(err, a, b, c) {
                assert(err === null);
                assert(a === 1);
                assert(b === 2);
                assert(c === 3);
            }), {spread: true});
            return spy.promise;
        });

        it("should work then result is not an array", function() {
            var spy = getSpy();
            Promise.resolve(3).nodeify(spy(function(err, a) {
                assert(err === null);
                assert(a === 3);
            }), {spread: true});
            return spy.promise;
        });

        it("should work if the callback throws when spread", function() {
            var err = new Error();
            Promise.resolve([1,2,3]).nodeify(function(_, a) {
                throw err;
            }, {spread: true});

            return awaitGlobalException(function(e) {
                assert.strictEqual(err, e);
            });
        });

        it("should work if the callback throws when rejected", function() {
            var err = new Error();
            Promise.reject(new Error()).nodeify(function(_, a) {
                throw err;
            });

            return awaitGlobalException(function(e) {
                assert.strictEqual(err, e);
            });
        });
    });
}