defineSuite([
        'Scene/SkyBox',
        'Core/Resource',
        'Scene/SceneMode',
        'Specs/createScene'
    ], function(
        SkyBox,
        Resource,
        SceneMode,
        createScene) {
    'use strict';

    var scene;
    var skyBox;
    var loadedImage;

    beforeAll(function() {
        scene = createScene();

        return Resource.fetchImage('./Data/Images/Blue.png').then(function(image) {
            loadedImage = image;
        });
    });

    afterAll(function() {
        scene.destroyForSpecs();
    });

    beforeEach(function() {
        scene.mode = SceneMode.SCENE3D;
    });

    afterEach(function() {
        skyBox = skyBox && skyBox.destroy();
        scene.skyBox = undefined;
    });

    it('draws a sky box from Images', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : loadedImage,
                negativeX : loadedImage,
                positiveY : loadedImage,
                negativeY : loadedImage,
                positiveZ : loadedImage,
                negativeZ : loadedImage
            }
        });

        expect(scene).toRender([0, 0, 0, 255]);

        scene.skyBox = skyBox;
        expect(scene).toRender([0, 0, 255, 255]);
    });

    it('does not render when show is false', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            },
            show : false
        });

        expect(scene).toRender([0, 0, 0, 255]);

        scene.skyBox = skyBox;
        expect(scene).toRender([0, 0, 0, 255]);
    });

    it('does not render in 2D', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });

        scene.mode = SceneMode.SCENE2D;
        expect(scene).toRender([0, 0, 0, 255]);

        scene.skyBox = skyBox;
        expect(scene).toRender([0, 0, 0, 255]);
    });

    it('does not render without a render pass', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });

        scene.frameState.passes.render = false;

        scene.skyBox = skyBox;

        var command = skyBox.update(scene.frameState);
        expect(command).not.toBeDefined();
    });

    it('gets constructor options', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : 'positiveX.png',
                negativeX : 'negativeX.png',
                positiveY : 'positiveY.png',
                negativeY : 'negativeY.png',
                positiveZ : 'positiveZ.png',
                negativeZ : 'negativeZ.png'
            },
            show : false
        });
        expect(skyBox.sources.positiveX).toEqual('positiveX.png');
        expect(skyBox.sources.negativeX).toEqual('negativeX.png');
        expect(skyBox.sources.positiveY).toEqual('positiveY.png');
        expect(skyBox.sources.negativeY).toEqual('negativeY.png');
        expect(skyBox.sources.positiveZ).toEqual('positiveZ.png');
        expect(skyBox.sources.negativeZ).toEqual('negativeZ.png');
        expect(skyBox.show).toEqual(false);
    });

    it('isDestroyed', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });
        expect(skyBox.isDestroyed()).toEqual(false);
        skyBox.destroy();
        expect(skyBox.isDestroyed()).toEqual(true);
        skyBox = undefined;
    });

    it('throws when constructed without positiveX', function() {
        skyBox = new SkyBox({
            sources : {
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed without negativeX', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed without positiveY', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed without negativeY', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed without positiveZ', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed without negativeZ', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed when positiveX is a different type', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : loadedImage,
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed when negativeX is a different type', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : loadedImage,
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed when positiveY is a different type', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : loadedImage,
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed when negativeY is a different type', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : loadedImage,
                positiveZ : './Data/Images/Blue.png',
                negativeZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed when positiveZ is a different type', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : loadedImage,
                negativeZ : './Data/Images/Blue.png'
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });

    it('throws when constructed when negativeZ is a different type', function() {
        skyBox = new SkyBox({
            sources : {
                positiveX : './Data/Images/Blue.png',
                negativeX : './Data/Images/Blue.png',
                positiveY : './Data/Images/Blue.png',
                negativeY : './Data/Images/Blue.png',
                positiveZ : './Data/Images/Blue.png',
                negativeZ : loadedImage
            }
        });
        scene.skyBox = skyBox;

        expect(function() {
            return scene.render();
        }).toThrowDeveloperError();
    });
}, 'WebGL');