/V4/PrismLibrary/Desktop/Prism.Tests/Regions/LocatorNavigationTargetHandlerFixture.cs

//===================================================================================

// Microsoft patterns & practices

// Composite Application Guidance for Windows Presentation Foundation and Silverlight

//===================================================================================

// Copyright (c) Microsoft Corporation.  All rights reserved.

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY

// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT

// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

// FITNESS FOR A PARTICULAR PURPOSE.

//===================================================================================

// The example companies, organizations, products, domain names,

// e-mail addresses, logos, people, places, and events depicted

// herein are fictitious.  No association with any real company,

// organization, product, domain name, email address, logo, person,

// places, or events is intended or should be inferred.

//===================================================================================

using System;

using System.Windows;

using Microsoft.Practices.Prism.Regions;

using Microsoft.Practices.Prism.TestSupport;

using Microsoft.Practices.ServiceLocation;

using Microsoft.VisualStudio.TestTools.UnitTesting;

using Moq;



namespace Microsoft.Practices.Prism.Tests.Regions

{

    [TestClass]

    public class LocatorNavigationTargetHandlerFixture

    {

        [TestMethod]

        public void WhenViewExistsAndDoesNotImplementINavigationAware_ThenReturnsView()

        {

            // Arrange



            var serviceLocatorMock = new Mock<IServiceLocator>();



            var region = new Region();



            var view = new TestView();



            region.Add(view);



            var navigationContext = new NavigationContext(null, new Uri(view.GetType().Name, UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            // Act



            var returnedView = navigationTargetHandler.LoadContent(region, navigationContext);





            // Assert



            Assert.AreSame(view, returnedView);

        }



        [TestMethod]

        public void WhenRegionHasMultipleViews_ThenViewsWithMatchingTypeNameAreConsidered()

        {

            // Arrange



            var serviceLocatorMock = new Mock<IServiceLocator>();



            var region = new Region();



            var view1 = new TestView();

            var view2 = "view";



            region.Add(view1);

            region.Add(view2);



            var navigationContext = new NavigationContext(null, new Uri(view2.GetType().Name, UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            // Act



            var returnedView = navigationTargetHandler.LoadContent(region, navigationContext);





            // Assert



            Assert.AreSame(view2, returnedView);

        }



        [TestMethod]

        public void WhenRegionHasMultipleViews_ThenViewsWithMatchingFullTypeNameAreConsidered()

        {

            // Arrange



            var serviceLocatorMock = new Mock<IServiceLocator>();



            var region = new Region();



            var view1 = new TestView();

            var view2 = "view";



            region.Add(view1);

            region.Add(view2);



            var navigationContext = new NavigationContext(null, new Uri(view2.GetType().FullName, UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            // Act



            var returnedView = navigationTargetHandler.LoadContent(region, navigationContext);





            // Assert



            Assert.AreSame(view2, returnedView);

        }



        [TestMethod]

        public void WhenViewExistsAndImplementsINavigationAware_ThenViewIsQueriedForNavigationAndIsReturnedIfAcceptsIt()

        {

            // Arrange



            var serviceLocatorMock = new Mock<IServiceLocator>();



            var region = new Region();



            var viewMock = new Mock<INavigationAware>();

            viewMock

                .Setup(v => v.IsNavigationTarget(It.IsAny<NavigationContext>()))

                .Returns(true)

                .Verifiable();



            region.Add(viewMock.Object);



            var navigationContext = new NavigationContext(null, new Uri(viewMock.Object.GetType().Name, UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            // Act



            var returnedView = navigationTargetHandler.LoadContent(region, navigationContext);





            // Assert



            Assert.AreSame(viewMock.Object, returnedView);

            viewMock.VerifyAll();

        }



        [TestMethod]

        public void WhenViewExistsAndHasDataContextThatImplementsINavigationAware_ThenDataContextIsQueriedForNavigationAndIsReturnedIfAcceptsIt()

        {

            // Arrange



            var serviceLocatorMock = new Mock<IServiceLocator>();



            var region = new Region();



            var dataContextMock = new Mock<INavigationAware>();

            dataContextMock

                .Setup(v => v.IsNavigationTarget(It.IsAny<NavigationContext>()))

                .Returns(true)

                .Verifiable();

            var viewMock = new Mock<FrameworkElement>();

            viewMock.Object.DataContext = dataContextMock.Object;



            region.Add(viewMock.Object);



            var navigationContext = new NavigationContext(null, new Uri(viewMock.Object.GetType().Name, UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            // Act



            var returnedView = navigationTargetHandler.LoadContent(region, navigationContext);





            // Assert



            Assert.AreSame(viewMock.Object, returnedView);

            dataContextMock.VerifyAll();

        }



        [TestMethod]

        public void WhenNoCurrentMatchingViewExists_ThenReturnsNewlyCreatedInstanceWithServiceLocatorAddedToTheRegion()

        {

            // Arrange



            var serviceLocatorMock = new Mock<IServiceLocator>();



            var region = new Region();



            var view = new TestView();



            serviceLocatorMock

                .Setup(sl => sl.GetInstance<object>(view.GetType().Name))

                .Returns(view);



            var navigationContext = new NavigationContext(null, new Uri(view.GetType().Name, UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            // Act



            var returnedView = navigationTargetHandler.LoadContent(region, navigationContext);





            // Assert



            Assert.AreSame(view, returnedView);

            Assert.IsTrue(region.Views.Contains(view));

        }



        [TestMethod]

        public void WhenViewExistsAndImplementsINavigationAware_ThenViewIsQueriedForNavigationAndNewInstanceIsCreatedIfItRejectsIt()

        {

            // Arrange



            var serviceLocatorMock = new Mock<IServiceLocator>();



            var region = new Region();



            var viewMock = new Mock<INavigationAware>();

            viewMock

                .Setup(v => v.IsNavigationTarget(It.IsAny<NavigationContext>()))

                .Returns(false)

                .Verifiable();



            region.Add(viewMock.Object);



            var newView = new TestView();



            serviceLocatorMock

                .Setup(sl => sl.GetInstance<object>(viewMock.Object.GetType().Name))

                .Returns(newView);



            var navigationContext = new NavigationContext(null, new Uri(viewMock.Object.GetType().Name, UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            // Act



            var returnedView = navigationTargetHandler.LoadContent(region, navigationContext);





            // Assert



            Assert.AreSame(newView, returnedView);

            Assert.IsTrue(region.Views.Contains(newView));

            viewMock.VerifyAll();

        }



        [TestMethod]

        public void WhenViewExistsAndHasDataContextThatImplementsINavigationAware_ThenDataContextIsQueriedForNavigationAndNewInstanceIsCreatedIfItRejectsIt()

        {

            // Arrange



            var serviceLocatorMock = new Mock<IServiceLocator>();



            var region = new Region();



            var dataContextMock = new Mock<INavigationAware>();

            dataContextMock

                .Setup(v => v.IsNavigationTarget(It.IsAny<NavigationContext>()))

                .Returns(false)

                .Verifiable();

            var viewMock = new Mock<FrameworkElement>();

            viewMock.Object.DataContext = dataContextMock.Object;



            region.Add(viewMock.Object);



            var newView = new TestView();



            serviceLocatorMock

                .Setup(sl => sl.GetInstance<object>(viewMock.Object.GetType().Name))

                .Returns(newView);



            var navigationContext = new NavigationContext(null, new Uri(viewMock.Object.GetType().Name, UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            // Act



            var returnedView = navigationTargetHandler.LoadContent(region, navigationContext);





            // Assert



            Assert.AreSame(newView, returnedView);

            Assert.IsTrue(region.Views.Contains(newView));

            dataContextMock.VerifyAll();

        }



        [TestMethod]

        public void WhenViewCannotBeCreated_ThenThrowsAnException()

        {

            var serviceLocatorMock = new Mock<IServiceLocator>();

            serviceLocatorMock

                .Setup(sl => sl.GetInstance<object>(typeof(TestView).Name))

                .Throws<ActivationException>();



            var region = new Region();



            var navigationContext = new NavigationContext(null, new Uri(typeof(TestView).Name, UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            // Act



            ExceptionAssert.Throws<InvalidOperationException>(

                () =>

                {

                    navigationTargetHandler.LoadContent(region, navigationContext);



                });

        }



        [TestMethod]

        public void WhenViewAddedByHandlerDoesNotImplementINavigationAware_ThenReturnsView()

        {

            // Arrange



            var serviceLocatorMock = new Mock<IServiceLocator>();



            var region = new Region();



            var view = new TestView();



            serviceLocatorMock

                .Setup(sl => sl.GetInstance<object>(view.GetType().Name))

                .Returns(view);



            var navigationContext = new NavigationContext(null, new Uri(view.GetType().Name, UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            // Act



            var firstReturnedView = navigationTargetHandler.LoadContent(region, navigationContext);

            var secondReturnedView = navigationTargetHandler.LoadContent(region, navigationContext);





            // Assert



            Assert.AreSame(view, firstReturnedView);

            Assert.AreSame(view, secondReturnedView);

            serviceLocatorMock.Verify(sl => sl.GetInstance<object>(view.GetType().Name), Times.Once());

        }



        [TestMethod]

        public void WhenRequestingContentForNullRegion_ThenThrows()

        {

            var serviceLocatorMock = new Mock<IServiceLocator>();



            var navigationContext = new NavigationContext(null, new Uri("/", UriKind.Relative));



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            ExceptionAssert.Throws<ArgumentNullException>(

                () =>

                {

                    navigationTargetHandler.LoadContent(null, navigationContext);



                });

        }



        [TestMethod]

        public void WhenRequestingContentForNullContext_ThenThrows()

        {

            var serviceLocatorMock = new Mock<IServiceLocator>();



            var region = new Region();



            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);





            ExceptionAssert.Throws<ArgumentNullException>(

                () =>

                {

                    navigationTargetHandler.LoadContent(region, null);



                });

        }



        public class TestRegionNavigationContentLoader : RegionNavigationContentLoader

        {

            public TestRegionNavigationContentLoader(IServiceLocator serviceLocator)

                : base(serviceLocator)

            { }

        }



        public class TestView { }

    }

}