Cannot find Assert.Fail and Assert.Pass or equivalent

The documentation includes a comparison chart including this:

Fail - xUnit.net alternative: Assert.True(false, "message")

(It doesn't show Assert.Pass, and I've never used that myself, but I suspect the alternative is just to return from the test. Of course that doesn't help if you want to throw it in a nested method call. My suspicion is that it's not very frequently used in NUnit, hence its absence in the comparison chart.)

An alternative to Assert.Fail("messsage") suggested by xUnit docs

xUnit.net alternative: Assert.True(false, "message")

has a downside – its output is

message

Expected: True
Actual:   False

To get rid of

Expected: True
Actual:   False

don't call Assert.True(false, "message") throw Xunit.Sdk.XunitException instead.
For example, create a helper method similar to this:

public static class MyAssert
{
    public static void Fail(string message)
        => throw new Xunit.Sdk.XunitException(message);
}