Create a test that performs negative testing on the boundaries of the rating range. That is, test the values 0 and 6 as a rating (the values just outside the legal range). We expect these to return false, so assert false in the result dialog. You will notice that one of these actually (incorrectly) returns true. This is the bug we uncovered earlier in manual testing. Make sure that you assert false anyway. The assertion states the expected result, not the actual result.
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