Assert statements in tests are problematic

[colidyre]

Assert statements with inline if/else blocks in the tests are misleading.

An assert statement like assert response.status_code == 200 if i < 5 else 429 will be evaluated to assert 429 for all i >=5, i.e. the test will be every time green for all requests after the 5th request.

I have already provided a PR to fix this: #240.