c# - 适当的断言消息

Question

在测试中，我试图断言两个 TextSpan 列表的相等性/等效性，如下所示:

var expectedSpans = new List<TextSpan>()
    {
     new TextSpan { iStartLine = 1, iEndLine = 1, iStartIndex = 1, iEndIndex = 1}
    };

var obtainedSpans = new List<TextSpan>()
    {
     new TextSpan { iStartLine = 2, iEndLine = 2, iStartIndex = 1, iEndIndex = 1}
    };
Assert.That(obtainedSpans, Is.EqualTo(expectedSpans), "Unexpected spans found");

我收到的消息是:

Expected tags were not obtained.
  Expected is <System.Collections.Generic.List`1[Microsoft.VisualStudio.TextManager.Interop.TextSpan]> with 1 elements, actual is <System.Collections.Generic.List`1[Microsoft.VisualStudio.TextManager.Interop.TextSpan]> with 1 elements
  Values differ at index [0]
  Expected: Microsoft.VisualStudio.TextManager.Interop.TextSpan
  But was:  Microsoft.VisualStudio.TextManager.Interop.TextSpan

我怎样才能得到更详细的消息，至少显示所有值，让我找出相等/等价丢失的地方？在等价断言的情况下，该消息也不提供信息。

Answer 1

您应该使用 CollectionAssert.AreEqual(expectedSpans, obtainedSpan, "Unexpected spans found") 进行正确的列表相等断言。

顺便说一句，两点:- 使用 Assert.AreEquals() 而不是 Assert.That(..., IsEqualTo())- 始终将 expected 放在 obtained 之前，以保证断言失败的可读性。