title: Generating Code Coverage in scrutinizer
body: <p>I created a little package and I want to get some qualifications for it.
  So one of them is <code>Scrutinizer</code> Coverage and Code Quality.
  As in the tutorial I created a file and renamed it to <code>scrutinizer.yml</code> and put the following into it:</p>
  
  <pre><code>build:
  tests:
      override:
          -
              command: 'vendor/bin/phpunit --coverage-clover=some-file'
              coverage:
                  file: 'some-file'
                  format: 'clover'
  </code></pre>
  
  <p>But after syncing in my <code>Scrutinizer</code> profile I get this "coverage NaN%"</p>
  
  <p>So what should I do?</p>