title: CakePHP 3: Unable to insert fixtures when running phpunit
body: <p>I just baked some Fixtures and some TestCases and whenever I run <code>vendor/bin/phpunit</code> I get a version of the following error:</p>
  
  <pre><code>$ vendor/bin/phpunit
  PHPUnit 4.7.7 by Sebastian Bergmann and contributors.
  
  IException: Unable to insert fixtures for "App\Test\TestCase\Controller\ScreensControllerTest" test case. SQLSTATE[HY000] [2002] No such file or directory in [/Applications/MAMP/htdocs/myapp/vendor/cakephp/cakephp/src/TestSuite/Fixture/FixtureManager.php, line 254]
  </code></pre>
  
  <p>The fixtures and tests were baked automatically using the bake tools. I checked that each item in the <code>$fixtures</code> property corresponds to a file in <code>tests/Fixture/</code>. If I comment out the <code>$fixtures</code> declaration in any of the test classes the error just moves to the next class. So it's not bad syntax in any specific fixture/test.</p>