Added test for leaderboard page

This addresses the issue #63. 

Please review and suggest changes. The test passes locally for me. 

Thanks.
Technically the test name is incorrect since the code is not verifying that the leaderboard is present, just that the page is reachable.

This is outside the original scope the git issue, but would you be interested in adding an `assert` that the leaderboard `table` is present *and* visible?