Add negative test cases for most tests

[YuPeiHenry]

Testing

Add negative test cases for most tests

Justification

In one of my previous PRs where I added new tests, it was not apparent that 1 of my tests was not working, until a reviewer found out from manual testing (thankfully). I was wondering if adding negative test cases to verify that a test is indeed working, is a good idea. Any thoughts? @leeyh20 @alexfjw @junkiattan

[damithc]

It's a good idea to have negative test cases 👍 Although, it may not necessarily catch that another test is passing no matter what. A negative test case doesn't mean the test case is expected to fail. It's a test case where we expect the SUT to react negatively e.g., throws an exception. The test case passes if the SUT reacts negatively.