mstest实现类似单元测试实现类似单元测试nunit中中assert.throws功能功能
我们做单元测试NUnit中,有一个断言Assert.Throws很好用,但当我们使用MsTest时你需要这样写:
代码如下:
[TestMethod]
[ExpectedException(typeof(ArgumentNullException))]
public void WriteToTextFile()
{
PDFUtility.WriteToTextFile(“D:\ACA.pdf”, null);
}
现在让我们来扩展一下也实现类似成功能,增加一个类,代码如下:
代码如下:
/// <summary>
/// Useful assertions for actions that are expected to throw an exception.
/// </summary>
public static class ExceptionAssert
{
/// <summary>
/// Executes an exception, expecting an exception to be thrown.
/// Like Assert.Throws in NUnit.
/// </summary>
/// <param name=”action”>The action to execute</param>
/// <returns>The exception thrown by the action</returns>
public static Exception Throws(Action action)
{
return Throws(action, null);
}
/// <summary>
/// Executes an exception, expecting an exception to be thrown.
/// Like Assert.Throws in NUnit.
/// </summary>
/// <param name=”action”>The action to execute</param>
/// <param name=”message”>The error message if the expected exception is not thrown</param>
/// <returns>The exception thrown by the action</returns>
public static Exception Throws(Action action, string message)
{
try
{
action();
}
catch (Exception ex)
{
// The action method has thrown the expected exception.
// Return the exception, in case the unit test wants to perform further assertions on it.
return ex;
}
// If we end up here, the expected exception was not thrown. Fail!
throw new AssertFailedException(message ?? “Expected exception was not thrown.”);
}
/// <summary>
/// Executes an exception, expecting an exception of a specific type to be thrown.
/// Like Assert.Throws in NUnit.
/// </summary>
/// <param name=”action”>The action to execute</param>
/// <returns>The exception thrown by the action</returns>
public static T Throws<T>(Action action) where T : Exception
{
return Throws<T>(action, null);
}
/// <summary>
/// Executes an exception, expecting an exception of a specific type to be thrown.
/// Like Assert.Throws in NUnit.
/// </summary>
/// <param name=”action”>The action to execute</param>
/// <param name=”message”>The error message if the expected exception is not thrown</param>
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