Function getVisibilityEventCount

test/unit/test-vsync.js:39–43

()

    });

    function getVisibilityEventCount() {
      return (
        doc.eventListeners.count('visibilitychange') - iniVisibilityEventCount
      );
    }

    it('should init correctly', () => {
      expect(vsync.canAnimate(contextNode)).to.be.true;