Turn on strict coverage testing

Author: h3xx

.travis.yml

@@ -16,7 +16,7 @@ before_script:
 
 script:
   - php phpunit.phar --version
-  - php phpunit.phar -v -c tests/phpunit.xml
+  - php phpunit.phar -v -c tests/phpunit.xml --coverage-text --strict-coverage --stop-on-risky
 
 notifications:
   email: false

tests/phpunit.xml

@@ -20,4 +20,9 @@
     <directory suffix="Test.php">./</directory>
   </testsuite>
 
+  <filter>
+    <whitelist>
+      <file>../Mobile_Detect.php</file>
+    </whitelist>
+  </filter>
 </phpunit>