The test cases and the description require the Dictionary method to be named "getMatchingWords", but the initial solution skeleton has the method named "getFittingWords"

In the description, the expected output does not include the underscore, but the test only passed if you include it. I suspect it has something to do with the markdown syntax pepkin88 mentioned.

The code that is automatically populated in the test fixture does not actually call the isSolved method.

Test.expect([[0,0,1],
             [0,1,2],
             [2,1,0]] === -1);

should be

Test.expect(isSolved[[0,0,1],
                     [0,1,2],
                     [2,1,0]])) === -1);