defineSuite([
        'Widgets/Viewer/viewerPerformanceWatchdogMixin',
        'Specs/createViewer',
        'Widgets/PerformanceWatchdog/PerformanceWatchdog'
    ], function(
        viewerPerformanceWatchdogMixin,
        createViewer,
        PerformanceWatchdog) {
    'use strict';

    var container;
    var viewer;
    beforeEach(function() {
        container = document.createElement('div');
        container.id = 'container';
        container.style.display = 'none';
        document.body.appendChild(container);
    });

    afterEach(function() {
        if (viewer && !viewer.isDestroyed()) {
            viewer = viewer.destroy();
        }

        document.body.removeChild(container);
    });

    it('mixin sets default values', function() {
        viewer = createViewer(container);
        viewer.extend(viewerPerformanceWatchdogMixin);
        expect(viewer.performanceWatchdog).toBeInstanceOf(PerformanceWatchdog);
    });

    it('mixin sets option values', function() {
        viewer = createViewer(container);
        viewer.extend(viewerPerformanceWatchdogMixin, {
            lowFrameRateMessage : 'Foo'
        });
        expect(viewer.performanceWatchdog.viewModel.lowFrameRateMessage).toBe('Foo');
    });

    it('throws if not given a viewer', function() {
        expect(function() {
            viewerPerformanceWatchdogMixin();
        }).toThrowDeveloperError();
    });
}, 'WebGL');