queen-attack.spec.js file does not test "edge" case (#500)
queen-attack.spec.js file does not test "edge" case (#500)

Issues:
Fixes #499

Problem:
Solutions which current pass all tests would fail in an edge case.

Analysis:
Added a test in queen-attack.spec.js which tests for this edge case.

Tests:
Ran tests with npm against example solution mentioned in issue #499 to confirm that this example solution fails for new edge case test, and that test only.
exercism/xecmascript,exercism/xecmascript,tejasbubane/xecmascript,tejasbubane/xecmascript