diff --git a/phpunit.xml b/phpunit.xml
index da2ebe1..92c3a27 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -7,9 +7,14 @@
          convertWarningsToExceptions="true"
          processIsolation="false"
          stopOnFailure="false">
-    <testsuites>
-        <testsuite name="Unit">
-            <directory suffix="Test.php">./tests</directory>
-        </testsuite>
-    </testsuites>
+  <testsuites>
+    <testsuite name="Unit">
+      <directory suffix="Test.php">./tests</directory>
+    </testsuite>
+  </testsuites>
+  <filter>
+    <whitelist processUncoveredFilesFromWhitelist="true">
+      <directory suffix=".php">./lib</directory>
+    </whitelist>
+  </filter>
 </phpunit>
\ No newline at end of file