不具有ExpectedException属性的nUnit中的Expect异常 [英] Expect exceptions in nUnit without the ExpectedException attribute

问题描述

我有一个以上参数的方法，只要有任何参数为空，就会抛出ArgumentNullExceptions和ArgumentExceptions来防止输入错误.

因此，有两种显而易见的方法可以对此进行测试:

• 使用[ExpectedException]属性的每个参数进行一次测试
• 使用多个try {} catch块对所有参数进行一次测试

尝试捕获的东西看起来像这样:

try 
{
    controller.Foo(null, new SecondParameter());
    Assert.Fail("ArgumentNullException wasn't thrown");
} catch (ArgumentNullException)
{}

有一个小问题.如果测试通过，则不会调用Assert.Fail，因此将被突出显示为未被覆盖的测试代码(由NCover提供).

我知道这实际上不是问题，因为这是我想要100％覆盖的业务代码，而不是测试代码.还是我很好奇，是否有一种方法可以将多个抛出异常的调用压缩到一个Testcase中而不会丢失LoC?

解决方案

来自

http://www. andreas-schlapsi.com/2008/03/31/nunit-247-includes-rowtest-extension/ 该代码来自Nunit RowTestExtension的源代码，位于 Google代码

I have methods with more than one parameter that are guarded against bad input by throwing ArgumentNullExceptions and ArgumentExceptions whenever any parameter is null.

So there are two obvious ways to test this:

• One test per Parameter using the [ExpectedException] attribute
• One test for all parameters using multiple try{} catch blocks

The try catch thing would look like that:

try 
{
    controller.Foo(null, new SecondParameter());
    Assert.Fail("ArgumentNullException wasn't thrown");
} catch (ArgumentNullException)
{}

With one little problem. If the test passes, Assert.Fail never gets called and will therefore be highlighted as not covered test code (by NCover).

I know this isn't actually a problem, since it's the business code I want 100% coverage of, not the test code. Still I am curious if there is a way to compress multiple Exception throwing calls into one Testcase without having dead LoCs?

解决方案

From release notes of NUnit 2.4.7 NUnit now includes the RowTest extension, written by Andreas Schlapsi, in it's extension assemblies. This extension allows you to write test methods that take arguments and to provide multiple sets of argument values using the RowAttribute. To use RowTest, your test must reference the nunit.framework.extensions assembly.

It adds to NUnit the RowTest feature from MbUnit.

You can than write something like:

[RowTest]
[Row(1, 2, 3)]
[Row(3, 4, 8, TestName="Special case")]
[Row(10, 10, 0, TestName="ExceptionTest1"
    , ExpectedException=typeof(ArgumentException)
    , ExceptionMessage="x and y may not be equal.")]
[Row(1, 1, 0, TestName="ExceptionTest2"
    , ExpectedException=typeof(ArgumentException)
    , ExceptionMessage="x and y may not be equal.")]
public void AddTest(int x, int y, int expectedSum)
{
  int sum = Sum(x, y);
  Assert.AreEqual(expectedSum, sum);
}

http://www.andreas-schlapsi.com/2008/03/31/nunit-247-includes-rowtest-extension/ The code is from source code for Nunit RowTestExtension at Google code

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