There is a constraint for inclusive range check (aka closed set check): Assert.That(..., Is.InRange(a, b)). I wonder if there is a built in Assert for open set check? I want to test if a value is between two others exclusive.
No, it only has the closed range check. For an exclusive check, you will have to spell out the comparison explicitly.
For example...
Assert.That(myVal, Is.GreaterThan(4).And.LessThan(10));