Can you wirte your unittest in a way that someone can see what value you expectet and which value you get?

one of your test cases is a bit strange

An empty array has not the all elements greater than zero - Expected: true, instead got: false

I think the test for that is:
Test.expect([].all(isGreaterThanZero), 'An empty array has not all elements greater than zero');

but you Expected true. in this case i expect false.

Your code is very compact, but this is not clever oder "best practice" is only a very short.
Good code should be easy to read.