taimed/node_modules/promises-aplus-tests/lib/tests/helpers/thenables.js

"use strict";

var adapter = global.adapter;
var resolved = adapter.resolved;
var rejected = adapter.rejected;
var deferred = adapter.deferred;

var other = { other: "other" }; // a value we don't want to be strict equal to

exports.fulfilled = {
    "a synchronously-fulfilled custom thenable": function (value) {
        return {
            then: function (onFulfilled) {
                onFulfilled(value);
            }
        };
    },

    "an asynchronously-fulfilled custom thenable": function (value) {
        return {
            then: function (onFulfilled) {
                setTimeout(function () {
                    onFulfilled(value);
                }, 0);
            }
        };
    },

    "a synchronously-fulfilled one-time thenable": function (value) {
        var numberOfTimesThenRetrieved = 0;
        return Object.create(null, {
            then: {
                get: function () {
                    if (numberOfTimesThenRetrieved === 0) {
                        ++numberOfTimesThenRetrieved;
                        return function (onFulfilled) {
                            onFulfilled(value);
                        };
                    }
                    return null;
                }
            }
        });
    },

    "a thenable that tries to fulfill twice": function (value) {
        return {
            then: function (onFulfilled) {
                onFulfilled(value);
                onFulfilled(other);
            }
        };
    },

    "a thenable that fulfills but then throws": function (value) {
        return {
            then: function (onFulfilled) {
                onFulfilled(value);
                throw other;
            }
        };
    },

    "an already-fulfilled promise": function (value) {
        return resolved(value);
    },

    "an eventually-fulfilled promise": function (value) {
        var d = deferred();
        setTimeout(function () {
            d.resolve(value);
        }, 50);
        return d.promise;
    }
};

exports.rejected = {
    "a synchronously-rejected custom thenable": function (reason) {
        return {
            then: function (onFulfilled, onRejected) {
                onRejected(reason);
            }
        };
    },

    "an asynchronously-rejected custom thenable": function (reason) {
        return {
            then: function (onFulfilled, onRejected) {
                setTimeout(function () {
                    onRejected(reason);
                }, 0);
            }
        };
    },

    "a synchronously-rejected one-time thenable": function (reason) {
        var numberOfTimesThenRetrieved = 0;
        return Object.create(null, {
            then: {
                get: function () {
                    if (numberOfTimesThenRetrieved === 0) {
                        ++numberOfTimesThenRetrieved;
                        return function (onFulfilled, onRejected) {
                            onRejected(reason);
                        };
                    }
                    return null;
                }
            }
        });
    },

    "a thenable that immediately throws in `then`": function (reason) {
        return {
            then: function () {
                throw reason;
            }
        };
    },

    "an object with a throwing `then` accessor": function (reason) {
        return Object.create(null, {
            then: {
                get: function () {
                    throw reason;
                }
            }
        });
    },

    "an already-rejected promise": function (reason) {
        return rejected(reason);
    },

    "an eventually-rejected promise": function (reason) {
        var d = deferred();
        setTimeout(function () {
            d.reject(reason);
        }, 50);
        return d.promise;
    }
};