8

我在代码库中有一些方法依赖于 Application.Current.Dispatcher.Invoke... 以确保事情在 GUI 线程上运行。我目前正在尝试为这些方法编写单元测试,但(如预期的那样)Application.Current 为空,所以我得到了 NullReferenceException。

我尝试按照此处的建议在他们自己的 AppDomain 中运行受影响的测试:http: //social.msdn.microsoft.com/Forums/en-US/wpf/thread/786d5c06-0511-41c0-a6a2-5c4e44f8ffb6/

但是当我这样做时,Application.Current 仍然为空。不应该启动 AppDomain 为我设置 Application.Current 吗?为什么它仍然为空?

我的代码:基类:

[TestClass()]
[Serializable]
public class UnitTest
{
    protected void ExecuteInSeparateAppDomain(string methodName)
    {
        AppDomainSetup appDomainSetup = new AppDomainSetup();
        appDomainSetup.ApplicationBase = Environment.CurrentDirectory;
        AppDomain appDomain = AppDomain.CreateDomain(methodName, null, appDomainSetup);

        try
        {
            appDomain.UnhandledException += delegate(object sender, UnhandledExceptionEventArgs e)
            {
                throw e.ExceptionObject as Exception;
            };

            UnitTest unitTest = appDomain.CreateInstanceAndUnwrap(GetType().Assembly.GetName().Name, GetType().FullName) as UnitTest;

            MethodInfo methodInfo = unitTest.GetType().GetMethod(methodName, BindingFlags.NonPublic | BindingFlags.Instance);

            if (methodInfo == null)
            {
                throw new InvalidOperationException(string.Format("Method '{0}' not found on type '{1}'.", methodName, unitTest.GetType().FullName));
            }

            try
            {
                methodInfo.Invoke(unitTest, null);
            }
            catch (System.Reflection.TargetInvocationException e)
            {
                throw e.InnerException;
            }
        }
        finally
        {
            AppDomain.Unload(appDomain);
        }
    }
}

调用单元测试(包含在继承自 UnitTest 的类中):

[TestMethod()]
public void QualifierViewModel_FlagsAndLoadDatasets()
{
    ExecuteInSeparateAppDomain("TestLoadDataSets");
}
4

3 回答 3

13

所以现在我有一个讨厌的解决方法。我基本上将所有使用 Application.Current 的测试方法移动到一个测试中(因此它们都将在同一个线程上)并调用 new Application()。

讨厌的代码:

[TestClass]
    public class IntegrationTests
    {
        private CedarFile testCedarFile;

        /// <summary>
        /// This test tests methods that utilize Application.Current. 
        /// They all have to be in the same test because they must run on the same thread to use the Application instance.
        /// </summary>
        [TestMethod]
        public void IntegrationTests_All()
        {
            new Application();

            QualifierViewModel_FlagsAndLoadDatasets();
            CurrentFilesViewModel_AddCedarFile();
            CurrentFilesViewModel_AddCedarFileReadOnly();
        }
... the private methods to test ...
}
于 2012-09-27T19:53:02.747 回答
0

此解决方法对我有用:

[TestClass]
public class MockAppTests
{
    private static Application application = new Application() { ShutdownMode= ShutdownMode.OnExplicitShutdown };
}

[TestClass]
public class IntegrationTests : MockAppTests
{        
    [TestMethod]
    public void MyTest()
    {
        //test
    }
}
于 2014-07-11T11:05:24.213 回答
-1

尝试删除该Serializable属性,而是UnitTestMarshalByRefObject.

于 2012-09-27T16:42:41.833 回答