Re-raising Voile's issue closed by one very incompetent user. The task is a duplicate, and is solved not through bugfixing, but rewriting the code from scratch.

I think he was trying to make sense out of testing.

Fixed.

The example solution is O(n log n) where O(n) is perfectly possible, mutates its input and defines a spurious named constant.

In short: WTF ?!?

In medium: These are not Best Practices.

In long: Bored now.

Duplicate.

Also, these kind of bugfix is neither actual bugfixes, or meaningful at all.

Some sample tests are wrong.

Test.assertNotEquals(pathologist(evidence), evidence[0] !== ['crossbow'], "this is not the murder weapon");
Test.assertNotEquals(pathologist(evidence), evidence[0] !== ['crossbow'], "this is not the murder weapon")
Test.assertNotSimilar(pathologist(evidence), evidence[0] !== ['crossbow'], "this is not the murder weapon")

What are you testing there? The expected value there is true (a boolean) and note that you're comparing a string against an array, so returning anything that's not a booleans in the function, it'll pass.

More tests needed.