Description

I've come across a few scenarios where I need to validate specific properties and property combinations on Stream instances. I noticed the library does not expose any custom validations for such types so I had to workaround it.

I'd like to see simple validations such as:

• .BeWritable (stream.CanWrite)
• .BeReadable (stream.CanRead)
• .BeReadOnly (stream.CanRead && !stream.CanWrite)
• .BeWriteOnly (stream.CanWrite && !stream.CanRead)
• .BeSeekable (stream.CanSeek)

As well as potentially more advanced validations such as:

• .HaveContentsEquivalentTo(byte[]) (matches a given byte[] for readable streams)

Expected behavior:

stream.Should().BeReadOnly();

Actual behavior:

using (new AssertionScope())
{
    stream.CanRead.Should().BeTrue();
    stream.CanWrite.Should().BeFalse();
}

Versions

• Which version of Fluent Assertions are you using?
  5.10.3

• Which .NET runtime and version are you targeting? E.g. .NET framework 4.6.1 or .NET Core 2.1.
  Net Core 3.1 / Net 5

Additional Information

Related to #961