Ignore untestable files in code coverage (#924)

Author: lcharette

phpunit.xml

@@ -23,13 +23,8 @@
     </php>
     <filter>
       <whitelist addUncoveredFilesFromWhitelist="true" processUncoveredFilesFromWhitelist="false">
-          <directory suffix=".php">app/</directory>
-          <file>public/index.php</file>
-          <exclude>
-            <directory suffix=".php">app/vendor/</directory>
-            <directory suffix=".php">app/tests/</directory>
-            <directory suffix=".php">app/sprinkles/*/tests/</directory>
-          </exclude>
+          <directory suffix=".php">app/sprinkles/*/src/</directory>
+          <directory suffix=".php">app/system/</directory>
       </whitelist>
     </filter>
 </phpunit>