C＃：如何检查“没有异常发生”在我的单位测试？ [英] C#: How do I check "no exception occurred" in my unit test?

问题描述

我正在为一个返回void的方法编写单元测试。当没有异常抛出时，我想要一个测试通过的情况。如何在C＃中写？

  Assert.IsTrue（????）
  

（我猜这是我应该检查的，但是进入???）

我希望我的问题足够清楚。

解决方案

如果抛出异常，您的单元测试将失败 - 您不需要特别声明。

这是少数几种情况之一，您将看到单元测试根本没有断言 - 测试将如果引发异常，则会隐含地失败。

但是，如果你真的想为此写一个断言 - 也许能够捕获异常并报告预期的例外，但得到这个...，你可以这样做：

  [测试] 
 public void TestNoExceptionIsThrownByMethodUnderTest（） 
 {
 var myObject = new MyObject（）; 
 
 try 
 {
 myObject.MethodUnderTest（）; 
} 
 catch（Exception ex）
 {
 Assert.Fail（Expected no exception，but got：+ ex.Message）; 
} 
} 
  

（以上是NUnit的一个例子，同样适用于MSTest）

I'm writing a unit test for this one method which returns "void". I would like to have one case that the test passes when there is no exception thrown. How do I write that in C#?

Assert.IsTrue(????)

(My guess is this is how I should check, but what goes into "???")

I hope my question is clear enough.

解决方案

Your unit test will fail anyway if an exception is thrown - you don't need to put in a special assert.

This is one of the few scenarios where you will see unit tests with no assertions at all - the test will implicitly fail if an exception is raised.

However, if you really did want to write an assertion for this - perhaps to be able to catch the exception and report "expected no exception but got this...", you can do this:

[Test]
public void TestNoExceptionIsThrownByMethodUnderTest()
{
    var myObject = new MyObject();

    try
    {
        myObject.MethodUnderTest();
    }
    catch (Exception ex)
    {
        Assert.Fail("Expected no exception, but got: " + ex.Message);
    }
}

(the above is an example for NUnit, but the same holds true for MSTest)

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