delete some super-trivial tests

[cyrgani]

None of these test for anything interesting as far as I see.

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[jdonszelmann]

Hmm, though I agree that these tests are trivial, and that most likely there are a thousand other tests that test similar behavior, I'm against removing them. When a complicated change breaks something, it's often nice for look for the simplest possible test that reproduces it. It's the closest thing we have to unit tests in our ui suite, which otherwise is much more like an integration test.

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[rustbot]

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[cyrgani]

I think that any change that would cause one of these tests to break would also make it impossible for you to even compile core or std, so you wouldn't be able to get to the point where you could run these tests.