diff --git a/prefill.php b/prefill.php
index ab36f73..b4caeec 100644
--- a/prefill.php
+++ b/prefill.php
@@ -96,7 +96,8 @@ $files = array_merge(
     glob(__DIR__ . '/*.md'),
     glob(__DIR__ . '/*.xml.dist'),
     glob(__DIR__ . '/composer.json'),
-    glob(__DIR__ . '/src/*.php')
+    glob(__DIR__ . '/src/*.php'),
+    glob(__DIR__ . '/tests/*.php'),
 );
 foreach ($files as $f) {
     $contents = file_get_contents($f);