defineSuite([
        'DataSources/EntityView',
        'Core/BoundingSphere',
        'Core/Cartesian3',
        'Core/Ellipsoid',
        'Core/JulianDate',
        'DataSources/ConstantPositionProperty',
        'DataSources/Entity',
        'Specs/createScene'
    ], function(
        EntityView,
        BoundingSphere,
        Cartesian3,
        Ellipsoid,
        JulianDate,
        ConstantPositionProperty,
        Entity,
        createScene) {
    'use strict';

    var scene;
    var defaultOffset = EntityView.defaultOffset3D;

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

    beforeEach(function() {
        EntityView.defaultOffset3D = defaultOffset.clone();
    });

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

    it('throws when constructed without required values', function() {
        var entity = new Entity();
        var view;
        expect(function() {
            view = new EntityView(undefined, scene);
        }).toThrowDeveloperError();
        expect(function() {
            view = new EntityView(entity, undefined);
        }).toThrowDeveloperError();

        view = new EntityView(entity, scene);
        expect(view.ellipsoid).toBe(Ellipsoid.WGS84);
    });

    it('constructor sets expected values', function() {
        var entity = new Entity();
        var ellipsoid = Ellipsoid.UNIT_SPHERE;
        var view = new EntityView(entity, scene, ellipsoid);
        expect(view.entity).toBe(entity);
        expect(view.scene).toBe(scene);
        expect(view.ellipsoid).toBe(Ellipsoid.UNIT_SPHERE);
    });

    it('can set and get defaultOffset3D', function() {
        var sampleOffset = new Cartesian3(1, 2, 3);
        EntityView.defaultOffset3D = sampleOffset;
        var entity = new Entity();
        entity.position = new ConstantPositionProperty(Cartesian3.fromDegrees(0.0, 0.0));
        var view = new EntityView(entity, scene);
        view.update(JulianDate.now());
        expect(EntityView.defaultOffset3D).toEqualEpsilon(sampleOffset, 1e-10);
        expect(view.scene.camera.position).toEqualEpsilon(sampleOffset, 1e-10);
    });

    it('uses entity viewFrom', function() {
        var sampleOffset = new Cartesian3(1, 2, 3);
        var entity = new Entity();
        entity.position = new ConstantPositionProperty(Cartesian3.fromDegrees(0.0, 0.0));
        entity.viewFrom = sampleOffset;
        var view = new EntityView(entity, scene);
        view.update(JulianDate.now());
        expect(view.scene.camera.position).toEqualEpsilon(sampleOffset, 1e-10);
    });

    it('uses entity bounding sphere', function() {
        var sampleOffset = new Cartesian3(-1.3322676295501878e-15, -7.348469228349534, 7.3484692283495345);
        var entity = new Entity();
        entity.position = new ConstantPositionProperty(Cartesian3.fromDegrees(0.0, 0.0));
        var view = new EntityView(entity, scene, undefined);
        view.update(JulianDate.now(), new BoundingSphere(new Cartesian3(3, 4, 5), 6));
        expect(view.scene.camera.position).toEqualEpsilon(sampleOffset, 1e-10);
    });

    it('uses entity viewFrom if available and boundingsphere is supplied', function() {
        var sampleOffset = new Cartesian3(1, 2, 3);
        var entity = new Entity();
        entity.position = new ConstantPositionProperty(Cartesian3.fromDegrees(0.0, 0.0));
        entity.viewFrom = sampleOffset;
        var view = new EntityView(entity, scene, undefined, new BoundingSphere(new Cartesian3(3, 4, 5), 6));
        view.update(JulianDate.now());
        expect(view.scene.camera.position).toEqualEpsilon(sampleOffset, 1e-10);
    });

    it('update throws without time parameter', function() {
        var entity = new Entity();
        entity.position = new ConstantPositionProperty(Cartesian3.ZERO);
        var view = new EntityView(entity, scene);
        expect(function() {
            view.update(undefined);
        }).toThrowDeveloperError();
    });

    it('update returns without entity.position property.', function() {
        var entity = new Entity();
        var view = new EntityView(entity, scene);
        view.update(JulianDate.now());
    });
}, 'WebGL');