With test/unit, and minitest, is it possible to fail any test that doesn't contain an assertion, or would monkey-patching be required (for example, checking if the assertion count increased after each test was executed)?

Background: I shouldn't write unit tests without assertions - at a minimum, I should use assert_nothing_raised if I'm smoke testing to indicate that I'm smoke testing.

Usually I write tests that fail first, but I'm writing some regression tests. Alternatively, I could supply an incorrect expected value to see if the test is comparing the expected and actual value.