title: simplecov gem code coverage
body: <p>i use minitest framework for testing and simplecov gem for code coverage. i have a problem about simplecov. my problem is lkie this:</p>
  
  <p>i wrote a model test. when i run the test using <strong>rake minitest:models</strong>, test runs and coverage shows %100. But when i run tests using <strong>bundle exec rake</strong>, the code coverage of same tests are shown missing.</p>
  
  <p>i make researching on net. some people also have problem like this about simplecov. but i could not find a solution for this.
  i'm waiting your ideas. Thanks in advance.</p>