r checkboxes = fixture('WithLineHeight');
          large = checkboxes[0];
          small = checkboxes[1];
        });

        test('checkboxes with >1 line-height have an equal height', function() {
          var largeRect = large.getBoundingClientRect();
          var largeStyle = getComputedStyle(large);

          assert.isTrue(largeRect.height === 3 * parseFloat(largeStyle.fontSize));
        });

        test('checkbox with <1 line-height are at least 1em tall', function() {
          var smallRect 