oltip.root).querySelector('#tooltip');
        assert.isTrue(isHidden(actualTooltip));

        MockInteractions.focus(target);
        assert.isFalse(isHidden(actualTooltip));

        var contentRect = tooltip.getBoundingClientRect();
        var divRect = target.getBoundingClientRect();

        // Should be fitted on the left side.
        expect(contentRect.left).to.be.equal(0);
        expect(contentRect.top).to.be.equal(divRect.height + tooltip.offset);
      });

      test('tooltip is positioned co