openmct/platform/core/test/capabilities/DelegationCapabilitySpec.js

/*global define,Promise,describe,it,expect,beforeEach,waitsFor,jasmine*/

/**
 * DelegationCapabilitySpec. Created by vwoeltje on 11/6/14.
 */
define(
    ["../../src/capabilities/DelegationCapability"],
    function (DelegationCapability) {
        "use strict";

        describe("The delegation capability", function () {
            var captured,
                typeDef = {},
                type,
                capabilities,
                children = [],
                object = {},
                delegation;

            function capture(k) { return function (v) { captured[k] = v; }; }
            function TestDomainObject(caps, id) {
                return {
                    getId: function () {
                        return id;
                    },
                    getCapability: function (name) {
                        return caps[name];
                    },
                    useCapability: function (name) {
                        return this.getCapability(name).invoke();
                    },
                    hasCapability: function (name) {
                        return this.getCapability(name) !== undefined;
                    }
                };
            }

            function mockPromise(value) {
                return {
                    then: function (callback) {
                        return value.then ?
                                value : mockPromise(callback(value));
                    }
                };
            }


            beforeEach(function () {
                captured = {};
                typeDef = {};
                typeDef.delegates = [ "foo" ];
                type = { getDefinition: function () { return typeDef; } };
                children = [];
                capabilities = {
                    type: type,
                    composition: { invoke: function () { return mockPromise(children); } }
                };
                object = new TestDomainObject(capabilities);

                delegation = new DelegationCapability({ when: mockPromise }, object);
            });

            it("provides a list of children which expose a desired capability", function () {

                children = [
                    new TestDomainObject({ foo: true }, 'has-capability'),
                    new TestDomainObject({ }, 'does-not-have-capability')
                ];

                // Look up delegates
                delegation.getDelegates('foo').then(capture('delegates'));

                // Expect only the first child to be a delegate
                expect(captured.delegates.length).toEqual(1);
                expect(captured.delegates[0].getId()).toEqual('has-capability');
            });
        });
    }
);