问题描述
我最近尝试使用（）写一个新的NUnit测试方法时Assert.Equals。在执行此方法将引发 AssertionException 说明 Assert.Equals不应该被用于断言。这是一个有点莫名其妙乍一看。这是怎么回事吗？
I recently attempted to use the method Assert.Equals() when writing a new NUnit test. Upon execution this method throws an AssertionException stating thatAssert.Equals should not be used for Assertions. This is a bit baffling at first glance. What's going on here?
推荐答案
断言是一个静态类从System.Object继承，因为所有的类在C＃中做的含蓄。 System.Object的实现以下的方法：
Assert is a static class inheriting from System.Object, as all classes do implicitly in c#. System.Object implements the following method:
static bool Equals(object a, object b)
这是用于相等的比较上断言的方法是<一href="http://www.nunit.org/index.php?p=equalityAsserts&r=2.2.7"><$c$c>Assert.AreEqual()的方法。因此，呼吁通过断言类的Object.Equals（）方法在单元测试肯定是一个错误。为了prevent这个错误和避免混淆，NUnit的开发商故意隐藏的Object.Equals 的断言类抛出异常的实现。这里的实现：
The methods on Assert which are intended for equality comparison are the Assert.AreEqual() methods. Therefore, calling the Object.Equals() method through the Assert class in a unit test is certainly a mistake. In order to prevent this mistake and avoid confusion, the developers of NUnit have intentionally hidden Object.Equals in the Assert class with an implementation that throws an exception. Here's the implementation:
/// <summary>
/// The Equals method throws an AssertionException. This is done
/// to make sure there is no mistake by calling this function.
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
[EditorBrowsable(EditorBrowsableState.Never)]
public static new bool Equals(object a, object b)
{
// TODO: This should probably be InvalidOperationException
throw new AssertionException("Assert.Equals should not be used for Assertions");
}
当然，除了消息本身是混乱的，但至少它可以让你知道你做的的东西的错误。
这篇关于NUnit的的Assert.Equals抛出异常＆QUOT; Assert.Equals不应该被用于断言＆QUOT;的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！