[hinkley]

That's two asserts, and yes you are essentially testing the same concept, which I'm comfortable with as long as it's not a regular thing. People go through all sorts of gymnastics to convince themselves "it's one thing" and I find it exhausting, especially since fixing the problem is usually easier than the rationalizing.

If multiple asserts is a regular thing, you can either start breaking down your tests, or write a custom matcher. The custom matcher gives you better diagnostics when it breaks, so is probably the way to go.

Assert.That(value, Is.Within(10, 100)); // matcher generates error message