defineSuite([
        'Widgets/NavigationHelpButton/NavigationHelpButton',
        'Core/FeatureDetection',
        'Specs/DomEventSimulator'
    ], function(
        NavigationHelpButton,
        FeatureDetection,
        DomEventSimulator) {
    'use strict';

    it('can create and destroy', function() {
        var container = document.createElement('span');
        container.id = 'testContainer';
        document.body.appendChild(container);

        var widget = new NavigationHelpButton({
            container : 'testContainer'
        });
        expect(widget.container.id).toBe(container.id);
        expect(widget.isDestroyed()).toEqual(false);

        widget.destroy();
        expect(widget.isDestroyed()).toEqual(true);

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

    it('does not show instructions by default', function() {
        var widget = new NavigationHelpButton({
            container : document.body
        });
        expect(widget.viewModel.showInstructions).toBe(false);
        widget.destroy();
    });

    it('shows instructions by default if told to do so in the constructor', function() {
        var widget = new NavigationHelpButton({
            container : document.body,
            instructionsInitiallyVisible : true
        });
        expect(widget.viewModel.showInstructions).toBe(true);
        widget.destroy();
    });

    function addCloseOnInputSpec(name, func) {
        it(name + ' event closes dropdown if target is not inside container', function() {
            var container = document.createElement('span');
            container.id = 'testContainer';
            document.body.appendChild(container);

            var widget = new NavigationHelpButton({
                container : 'testContainer'
            });

            widget.viewModel.showInstructions = true;
            func(document.body);
            expect(widget.viewModel.showInstructions).toEqual(false);

            widget.viewModel.showInstructions = true;
            func(container.firstChild);
            expect(widget.viewModel.showInstructions).toEqual(true);

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

    if (FeatureDetection.supportsPointerEvents()) {
        addCloseOnInputSpec('pointerDown', DomEventSimulator.firePointerDown);
    } else {
        addCloseOnInputSpec('mousedown', DomEventSimulator.fireMouseDown);
        addCloseOnInputSpec('touchstart', DomEventSimulator.fireTouchStart);
    }

    it('throws if container is undefined', function() {
        expect(function() {
            return new NavigationHelpButton({
                container : undefined
            });
        }).toThrowDeveloperError();
    });

    it('throws if options is undefined', function() {
        expect(function() {
            return new NavigationHelpButton(undefined);
        }).toThrowDeveloperError();
    });

    it('throws if options.container is undefined', function() {
        expect(function() {
            return new NavigationHelpButton({
                container : undefined
            });
        }).toThrowDeveloperError();
    });

    it('constructor throws with string element that does not exist', function() {
        expect(function() {
            return new NavigationHelpButton({
                container : 'does not exist'
            });
        }).toThrowDeveloperError();
    });
});