Oh, and can you do it in just one line? No; tricks; allowed;

Is this supposed to be a requirement? Why is it not enforced if yes? Why is this in the description if not?

There's no point in having so many tests.

The user's function and the reference solution are called twice if the output is wrong.

Tests are imitating Test.assert_equals for no reason.

Sample tests are broken.

list is a python keyword, so change it to lst or l or something similar that isn't a python keyword or module.

Duplicate and no random tests and initial comments are misleading.