Nobody here can see your code. I've changed the tests to properly compare the actual/expected values, so you should be able to reset the trainer and get useful feedback on test failure.

For some reason I misread your post and thought you were using Swift. I've edited the response for JS.

Always look to the sample tests. For example, the first test for JS is

Test.expect( goodVsEvil('1 1 1 1 1 1', '1 1 1 1 1 1 1') === 'Battle Result: Evil eradicates all trace of Good', 'Evil should win' );

and the right hand side of the equality statement is what you should be returning: namely, the string as in the problem description.