node-bluebird/test/mocha/finally.js

"use strict";
var assert = require("assert");
var testUtils = require("./helpers/util.js");
/*!
 *
Copyright 2009–2012 Kristopher Michael Kowal. All rights reserved.
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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IN THE SOFTWARE.
*/

describe("finally", function () {

    var exception1 = new Error("boo!");
    var exception2 = new Promise.TypeError("evil!");

    describe("when nothing is passed", function() {
        it("should do nothing", function() {
            return Promise.resolve("foo")
                .lastly()
                .lastly()
                .lastly()
                .lastly()
                .then(function(val){
                    assert(val === "foo");
                })
        });
    });

    describe("when the promise is fulfilled", function () {

        it("should call the callback", function() {
            var called = false;

            return Promise.resolve("foo")
            .lastly(function () {
                called = true;
            })
            .then(function () {
                assert.equal(called,true);
            });
        });

        it("should fulfill with the original value", function() {
            return Promise.resolve("foo")
            .lastly(function () {
                return "bar";
            })
            .then(function (result) {
                assert.equal(result,"foo");
            });
        });

        describe("when the callback returns a promise", function () {

            describe("that is fulfilled", function () {
                it("should fulfill with the original reason after that promise resolves", function() {
                    var promise = Promise.delay(1);

                    return Promise.resolve("foo")
                    .lastly(function () {
                        return promise;
                    })
                    .then(function (result) {
                        assert.equal(promise.isPending(),false);
                        assert.equal(result,"foo");
                    });
                });
            });

            describe("that is rejected", function () {
                it("should reject with this new rejection reason", function() {
                    return Promise.resolve("foo")
                    .lastly(function () {
                        return Promise.reject(exception1);
                    })
                    .then(function () {
                        assert.equal(false,true);
                    },
                    function (exception) {
                        assert.equal(exception,exception1);
                    });
                });
            });

        });

        describe("when the callback throws an exception", function () {
            it("should reject with this new exception", function() {
                return Promise.resolve("foo")
                .lastly(function () {
                    throw exception1;
                })
                .then(function () {
                    assert.equal(false,true);
                },
                function (exception) {
                    assert.equal(exception,exception1);
                });
            });
        });

    });

    describe("when the promise is rejected", function () {

        it("should call the callback", function() {
            var called = false;

            return Promise.reject(exception1)
            .lastly(function () {
                called = true;
            })
            .then(function () {
                assert.fail();
            }, function () {
                assert.equal(called,true);
            });
        });

        it("should reject with the original reason", function() {
            return Promise.reject(exception1)
            .lastly(function () {
                return "bar";
            })
            .then(function () {
                assert.equal(false,true);
            },
            function (exception) {
                assert.equal(exception,exception1);
            });
        });

        describe("when the callback returns a promise", function () {

            describe("that is fulfilled", function () {
                it("should reject with the original reason after that promise resolves", function() {
                    var promise = Promise.delay(1);

                    return Promise.reject(exception1)
                    .lastly(function () {
                        return promise;
                    })
                    .then(function () {
                        assert.equal(false,true);
                    },
                    function (exception) {
                        assert.equal(exception,exception1);
                        assert.equal(promise.isPending(),false);
                    });
                });
            });

            describe("that is rejected", function () {
                it("should reject with the new reason", function() {
                    return Promise.reject(exception1)
                    .lastly(function () {
                        return Promise.reject(exception2);
                    })
                    .then(function () {
                        assert.equal(false,true);
                    },
                    function (exception) {
                        assert.equal(exception,exception2);
                    });
                });
            });

        });

        describe("when the callback throws an exception", function () {
            it("should reject with this new exception", function() {
                return Promise.reject(exception1)
                .lastly(function () {
                    throw exception2;
                })
                .then(function () {
                    assert.equal(false,true);
                },
                function (exception) {
                    assert.equal(exception,exception2);
                });
            });
        });

    });

    describe("when the callback returns a thenable", function () {

        describe("that will fulfill", function () {
            it("should reject with the original reason after that", function() {
                var promise = {
                    then: function(fn) {
                        setTimeout(function(){
                            fn(15);
                        }, 1);
                    }
                };

                return Promise.reject(exception1)
                .lastly(function () {
                    return promise;
                })
                .then(function () {
                    assert.equal(false,true);
                },
                function (exception) {
                    assert.equal(exception,exception1);
                });
            });
        });

        describe("that is rejected", function () {
            it("should reject with the new reason", function() {
                var promise = {
                    then: function(f, fn) {
                        setTimeout(function(){
                            fn(exception2);
                        }, 1);
                    }
                };

                return Promise.reject(exception1)
                .lastly(function () {
                    return promise;
                })
                .then(function () {
                    assert.equal(false,true);
                },
                function (exception) {
                    assert.equal(exception,exception2);
                });
            });
            it("should reject with the new primitive reason", function() {
                var primitive = 3;
                var promise = {
                    then: function(f, fn) {
                        setTimeout(function(){
                            fn(primitive);
                        }, 1);
                    }
                };

                return Promise.reject(exception1)
                .lastly(function () {
                    return promise;
                })
                .then(function () {
                    assert.equal(false,true);
                },
                function (exception) {
                    assert.strictEqual(exception, primitive);
                });
            });
        });



    });
});