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1,对普通类(非WPF UI组件)进行测试:
这和在.Net2.0中使用NUnit进行测试时一样,不会出现任何问题,参考下面的代码:
以下是引用片段: [TestFixture] public class ClassTest { [Test] public void TestRun() { ClassLibrary1.Class1 obj = new ClassLibrary1.Class1(); double expected = 9; double result = obj.GetSomeValue(3); Assert.AreEqual(expected, result); } } |
2,对WPF UI组件进行测试
使用NUnit对WPF UI组件(比如MyWindow,MyUserControl)进行测试的时候,NUnit会报如下异常:“The calling thread must be STA, because many UI components require this”。
下面是错误的测试代码:
以下是引用片段: [TestFixture] public class ClassTest { [Test] public void TestRun() { WindowsApplication1.Window1 obj = new WindowsApplication1.Window1(); double expected = 9; double result = obj.GetSomeValue(3); Assert.AreEqual(expected, result); } } |
为了让调用线程为STA,我们可以编写一个辅助类CrossThreadTestRunner:
以下是引用片段: using System; using System.Collections.Generic; using System.Text; using System.Threading; using System.Security.Permissions; using System.Reflection; namespace TestUnit { public class CrossThreadTestRunner { private Exception lastException; public void RunInMTA(ThreadStart userDelegate) { Run(userDelegate, ApartmentState.MTA); } public void RunInSTA(ThreadStart userDelegate) { Run(userDelegate, ApartmentState.STA); } private void Run(ThreadStart userDelegate, ApartmentState apartmentState) { lastException = null; Thread thread = new Thread( delegate() { try { userDelegate.Invoke(); } catch (Exception e) { lastException = e; } }); thread.SetApartmentState(apartmentState); thread.Start(); thread.Join(); if (ExceptionWasThrown()) ThrowExceptionPreservingStack(lastException); } private bool ExceptionWasThrown() { return lastException != null; } [ReflectionPermission(SecurityAction.Demand)] private static void ThrowExceptionPreservingStack(Exception exception) { FieldInfo remoteStackTraceString = typeof(Exception).GetField( "_remoteStackTraceString", BindingFlags.Instance | BindingFlags.NonPublic); remoteStackTraceString.SetValue(exception, exception.StackTrace + Environment.NewLine); throw exception; } } } |
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