Description

It seems that when running a test on a string variable backslashes are escaped incorrectly. Especially trailing backslashes are removed from the message.

Complete minimal example reproducing the issue

See multiple unit tests in this gist: https://gist.github.com/rubenrorije/2caf183ffb7e598546d220797252795c

One of the examples of the unit tests:

[TestMethod]
public void Trailing_Backslash_In_Expected_Result_Should_Not_Be_Removed()
{
    "A".Should().Be("A\\");
    /*
     * Output:
     * Expected string to be "A" with a length of 2, but "A" has a length of 1, differs near "A" (index 0).
     * Expected Output:
     * Expected string to be "A\" with a length of 2, but "A" has a length of 1, differs near "A" (index 0).
     */
}

Versions

Fluent Assertions 5.5.3
.Net Framework 4.6.1

Remarks

I would have looked for myself whether this was something that I could solve myself and include a pull-request. But at the moment (travelling in Iran) I do not have reliable internet connection to do this.
Either someone else can take a look, or when I have the opportunity I will look into it more.