【mstest】mstest实现类似单元测试nunit中assert.throws功能-单元测试-nunit

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mstest实现类似单元测试nunit中assert.throws功能

/// <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>
/// <returns>The exception thrown by the action</returns>
public static T Throws<T>(Action action, string message) where T : Exception
{
try
{
action();
}
catch (Exception ex)
{
T actual=ex as T;
if (actual==null)
{
throw new AssertFailedException(message String.Format("Expected exception of type {0} not thrown. Actual exception type was {1}.", typeof(T), ex.GetType()));
}

// The action method has thrown the expected exception of type 'T'.
// Return the exception, in case the unit test wants to perform further assertions on it.
return actual;
}

// If we end up here, the expected exception of type 'T' was not thrown. Fail!
throw new AssertFailedException(message String.Format("Expected exception of type {0} not thrown.", typeof(T)));
}
}

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