title: How should I gauge unit test coverage for JS ? I can't be satisfied with jscoverage
body: <p>I wanna gauge unit test coverage for Javascript.</p>
  
  <p>jscoverage is one of the most useful tool.
  However, jscoverage can only gauges which the code pass or not on unit test.
  I wanna gauge coverage including logic.</p>
  
  <p>How should I gauge unit test coverage for JS ?</p>