title: Empty code coverage
body: <p>I'm trying to get code coverage for my unit tests with codeception.</p>
  
  <p>When i'm doing <code>vendor/bin/codecept run unit --coverage</code> it displays that :</p>
  
  <pre><code>  Classes:  0.00% (0/1) 
    Methods:  0.00% (0/3) 
    Lines:    0.00% (0/28)
  </code></pre>
  
  <p>Although I have tested 1 method over 3.</p>
  
  <p>I have xdebug installed with <code>coverage_enable=On</code></p>
  
  <p>Here is my codeception.yml config file :</p>
  
  <pre><code>actor: Tester
  paths:
      tests: tests
      log: tests/_output
      data: tests/_data
      support: tests/_support
      envs: tests/_envs
  settings:
      bootstrap: _bootstrap.php
      colors: true
      memory_limit: 1024M
  extensions:
      enabled:
          - Codeception\Extension\RunFailed
  modules:
      config:
          Db:
              dsn: ''
              user: ''
              password: ''
              dump: tests/_data/dump.sql
  coverage:
      enable: true
      remote: false
      include:
          - Simplifier/*
      exclude:
          - vendor/*
  </code></pre>
  
  <p>I'm trying to test Simplifier/Routing.php</p>
  
  <p>The test is OK, but my coverage is wrong.</p>
  
  <p>Any idea why ?</p>
  
  <p>Thanks.</p>