Ehhh... when it truly is two tests bodged into one, then sure.

But sometimes you do this kind of thing to avoid useless test brittleness: does your test check that `doSomething()` does what you expect, or do you have another test for that and this test only checks that `nowSomethingElse()` changes the object in a predictable way, e.g. updates a calculated field?

If it's the former, then it might be two tests masquerading as one, and this might make sense.

If it's the latter, you've changed a test that only checks what it cares about, and now you have a test that depends on unrelated implementation detail and will probably break unnecessarily in the future. Plus you've removed the assert that was documenting what it expects, so it's harder to tell if fixing it should mean updating both checks, or only the second one.