如何比较两个MemoryStream与FluentAssertions

Question

使用FluentAssertion 3.1.229，你如何比较两个不同的MemoryStream的内容？

写作actualStream.Should().Be(expectedStream);产生以下错误：

System.IO.MemoryStream 
{ 
    CanRead = True 
    CanSeek = True 
    CanTimeout = False 
    CanWrite = True 
    Capacity = 8 
    Length = 8 
    Position = 0 
    ReadTimeout = "[Property 'ReadTimeout' threw an exception: 'Exception has been thrown by the target of an invocation.']" 
    WriteTimeout = "[Property 'WriteTimeout' threw an exception: 'Exception has been thrown by the target of an invocation.']" 
}, but found 

System.IO.MemoryStream 
{ 
    CanRead = True 
    CanSeek = True 
    CanTimeout = False 
    CanWrite = True 
    Capacity = 8 
    Length = 8 
    Position = 0 
    ReadTimeout = "[Property 'ReadTimeout' threw an exception: 'Exception has been thrown by the target of an invocation.']" 
    WriteTimeout = "[Property 'WriteTimeout' threw an exception: 'Exception has been thrown by the target of an invocation.']" 
}. 

是的，我可以使用NUnit Assert.That(actualStream, Is.EqualTo(expectedStream));但有可能与FluentAssertions？

谢谢。

Answer 1

也许这会适合你吗？

actualStream.ToArray().Should().Be(expectedStream.ToArray()); 

Answer 2

你NUnit的解决方案将不能工作，因为MemoryStream的Equals实现并不做一个逐字节的比较。相反，使用

actualStream.GetBuffer().ShouldBeEquivalentTo(expectedStream.GetBuffer())。

GetBuffer返回对内部字节数组的引用并在其上调用Should().Be()将导致集合断言进行逐字节比较。