triangle: adding a new scalene test for two smaller sides equal

[YuriyCherniy]

Adding a new test for scalene(sides) function and renaming another test to match the new test. Current tests for scalene(sides) function can be hacked by this code:

def scalene(sides):
    sides.sort()
    if sum(sides[:2]) < sides[2] or sides[1] == sides[2]:
        return False
    return True

while the new test not.

[cmccandless]

Hi! Thanks for the PR!

Most test cases in the Python track are derived from the problem-specifications repository. You've identified a gap in the tests, so normally I would recommend adding the test to the canonical data first before it is added here. However, since that repository is currently frozen, we can add this test as a track-specific test for now.

Please address the following, and we'll be good to go:

• Revert name change on the existing test; the name comes from the canonical data, and we try to follow that when reasonable
• Rename your new test to something descriptive of why that test is different than two_sides_are_equal. I've suggested a change below; if you have something better you don't need to use my suggestion exactly

I would also recommend creating an issue in the [problem specifications] repository so that when the freeze is over, this test can be added there.

[cmccandless]

Merged; thanks for working on this!