openmct/platform/features/imagery/test/directives/MCTBackgroundImageSpec.js

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 * Open MCT Web, Copyright (c) 2014-2015, United States Government
 * as represented by the Administrator of the National Aeronautics and Space
 * Administration. All rights reserved.
 *
 * Open MCT Web is licensed under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License.
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 * http://www.apache.org/licenses/LICENSE-2.0.
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 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
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 *
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/*global define,describe,it,expect,beforeEach,jasmine,xit*/

define(
    ["../../src/directives/MCTBackgroundImage"],
    function (MCTBackgroundImage) {
        "use strict";

        describe("The mct-background-image directive", function () {
            var mockDocument,
                mockScope,
                mockElement,
                testImage,
                directive;

            beforeEach(function () {
                mockDocument = [
                    jasmine.createSpyObj('document', ['createElement'])
                ];
                mockScope = jasmine.createSpyObj('scope', ['$watch']);
                mockElement = jasmine.createSpyObj('element', [ 'css' ]);
                testImage = {};

                mockDocument[0].createElement.andReturn(testImage);

                directive = new MCTBackgroundImage(mockDocument);
            });

            it("is applicable as an attribute", function () {
                expect(directive.restrict).toEqual("A");
            });

            it("two-way-binds its own value", function () {
                expect(directive.scope.mctBackgroundImage).toEqual("=");
            });

            it("watches for changes to the URL", function () {
                directive.link(mockScope, mockElement, {});
                expect(mockScope.$watch).toHaveBeenCalledWith(
                    'mctBackgroundImage',
                    jasmine.any(Function)
                );
            });

            it("updates images in-order, even when they load out-of-order", function () {
                var firstOnload;

                directive.link(mockScope, mockElement);

                mockScope.$watch.mostRecentCall.args[1]("some/url/0");
                firstOnload = testImage.onload;

                mockScope.$watch.mostRecentCall.args[1]("some/url/1");

                // Resolve in a different order
                testImage.onload();
                firstOnload();

                // Should still have taken the more recent value
                expect(mockElement.css.mostRecentCall.args).toEqual([
                    "background-image",
                    "url('some/url/1')"
                ]);
            });

            it("clears the background image when undefined is passed in", function () {
                directive.link(mockScope, mockElement);

                mockScope.$watch.mostRecentCall.args[1]("some/url/0");
                testImage.onload();
                mockScope.$watch.mostRecentCall.args[1](undefined);

                expect(mockElement.css.mostRecentCall.args).toEqual([
                    "background-image",
                    undefined
                ]);
            });
        });
    }
);