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為WPF項目創(chuàng)建單元測試
作者:網(wǎng)絡(luò)轉(zhuǎn)載 發(fā)布時間:[ 2016/5/31 16:03:44 ] 推薦標簽:單元測試 軟件測試工具

  1、對普通類(非WPF UI組件)進行測試:
  這和在.Net2.0中使用NUnit進行測試時一樣,不會出現(xiàn)任何問題,參考下面的代碼:
  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、對WPF UI組件進行測試
  使用NUnit對WPF UI組件(比如MyWindow,MyUserControl)進行測試的時候,NUnit會報如下異常:“The calling thread must be STA, because many UI components require this”。
  下面是錯誤的測試代碼:
  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);
  }
  }
  為了讓調(diào)用線程為STA,我們可以編寫一個輔助類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;
  }
  }
  }
  并編寫正確的測試代碼:
  以下是引用片段:
  [TestFixture]
  public class ClassTest
  {
  [Test]
  public void TestRun()
  {
  CrossThreadTestRunner runner = new CrossThreadTestRunner();
  runner.RunInSTA(
  delegate
  {
  Console.WriteLine(Thread.CurrentThread.GetApartmentState());
  WindowsApplication1.Window1 obj = new WindowsApplication1.Window1();
  double expected = 9;
  double result = obj.GetSomeValue(3);
  Assert.AreEqual(expected, result);
  });
  }
  }
  另外,使用NUnit時,您需要添加對nunit.framework.dll的引用,并對測試類添加[TestFixture]屬性標記以及對測試方法添加[Test]屬性標記,然后將生成的程序集用nunit.exe打開可以了,關(guān)于NUnit的具體用法您可以參考其官方文檔。

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