How to implement XUnit descriptive Assert message?

Question

Context

in XUnit github I found this: Add Assert.Equal(expected, actual, message) overload #350 (so a developer ask for a non existing overload see below)

Quote from the answer:

We are a believer in self-documenting code; that includes your assertions.

(so the XUnit team rejects it)

OK, I got it. I also believe the self documenting code. Still I can not find out this use case:

Sample

// Arrange
// Create some external soap service client and its wrapper classes

// Act
// client.SomeMethod();

// Assert
// Sorry, soap service's interface, behaviour and design is *given*
// So I have to check if there is no Error, and 
// conveniently if there is, then I would like to see it in the assertion message

Assert.Equal(0, client.ErrorMessage.Length); // Means no error

// I would like to have the same result what would be the following *N*U*n*i*t* assert:
// Assert.AreEqual(0, client.ErrorMessage.Length, client.ErrorMessage); // Means no error

Question

How can I implement a descriptive assert message in this case in XUnit which still has no such an overload?

Answer 1

Use the suggestions provided at the link. Like fluent assertions or create your own assertion that wraps the Assert.True or Assert.False which were left with their message overloads. It was mentioned further down

Quote

You can provide messages to Assert.True and .False. If you simply cannot live without messages (and refuse to use a different assertion), you could always fall back to:

Assert.True(number == 2, "This is my message");

Quote:

If you really want to have messages you could add Fluent Assertions or maybe xbehave to your test projects and use their syntax. Fluent Assertions even throws xunit.net exceptions if it encounters its presence.