/V4/PrismLibrary/Desktop/Prism.Tests/ExceptionExtensionsFixture.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.Collections.Generic;

using System.Linq;

using System.Text;

using Microsoft.Practices.Prism;

using Microsoft.VisualStudio.TestTools.UnitTesting;



namespace Microsoft.Practices.Prism.Tests

{

    [TestClass]

    public class ExceptionExtensionsFixture

    {

        [TestMethod]

        // Note, this test cannot be run twice in the same test run, because the registeration is static 

        // and we're not supplying an 'Unregister' method

        public void CanRegisterFrameworkExceptionTypes()

        {

            Assert.IsFalse(ExceptionExtensions.IsFrameworkExceptionRegistered(typeof(MockException)));



            ExceptionExtensions.RegisterFrameworkExceptionType(typeof(MockException));



            Assert.IsTrue(ExceptionExtensions.IsFrameworkExceptionRegistered(typeof(MockException)));

        }



        [TestMethod]

        public void CanGetRootException()

        {

            Exception caughtException = null;

            ExceptionExtensions.RegisterFrameworkExceptionType(typeof(FrameworkException1));

            try

            {

                try

                {

                    throw new RootException();

                }

                catch (Exception ex)

                {

                    

                    throw new FrameworkException1(ex);

                }

            }

            catch (Exception ex)

            {

                caughtException = ex;

            }



            Assert.IsNotNull(caughtException);



            Exception exception = caughtException.GetRootException();



            Assert.IsInstanceOfType(exception, typeof(RootException));

        }



        [TestMethod]

        public void CanCompensateForInnerFrameworkExceptionType()

        {

            Exception caughtException = null;

            ExceptionExtensions.RegisterFrameworkExceptionType(typeof(FrameworkException2));

            try

            {

                try

                {

                    try

                    {

                        throw new RootException();

                    }

                    catch (Exception ex)

                    {

                        

                        throw new FrameworkException2(ex);

                    }

                }

                catch (Exception ex)

                {

                    

                    throw new NonFrameworkException(ex);

                }

            }

            catch (Exception ex)

            {

                caughtException = ex;

            }



            Assert.IsNotNull(caughtException);



            Exception exception = caughtException.GetRootException();

            Assert.IsInstanceOfType(exception, typeof(RootException));

        }



        [TestMethod]

        public void GetRootExceptionReturnsTopExceptionWhenNoUserExceptionFound()

        {

            Exception caughtException = null;

            ExceptionExtensions.RegisterFrameworkExceptionType(typeof(FrameworkException1));

            ExceptionExtensions.RegisterFrameworkExceptionType(typeof(FrameworkException2));

            try

            {

                try

                {

                    throw new FrameworkException1(null);

                }

                catch (Exception ex)

                {



                    throw new FrameworkException2(ex);

                }

            }

            catch (Exception ex)

            {

                caughtException = ex;

            }



            Assert.IsNotNull(caughtException);



            Exception exception = caughtException.GetRootException();

            Assert.IsInstanceOfType(exception, typeof(FrameworkException2));

        }

            

        private class MockException : Exception

        {



        }







        private class FrameworkException2 : Exception

        {

            public FrameworkException2(Exception innerException)

                : base("", innerException)

            {



            }

        }



        private class FrameworkException1:Exception

        {

            public FrameworkException1(Exception innerException) : base("", innerException)

            {

                

            }

        }



        private class RootException:Exception

        {}



        private class NonFrameworkException : Exception

        {

            public NonFrameworkException(Exception innerException)

                : base("", innerException)

            {

                

            }

        }



    }



    



}