diff --git a/core/phpunit.xml.dist b/core/phpunit.xml.dist
index 2e496b8..b788b65 100644
--- a/core/phpunit.xml.dist
+++ b/core/phpunit.xml.dist
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<phpunit bootstrap="tests/bootstrap.php" colors="true">
+<phpunit bootstrap="tests/bootstrap.php" colors="true"
+         beStrictAboutTestsThatDoNotTestAnything="true"
+         beStrictAboutOutputDuringTests="true"
+         beStrictAboutChangesToGlobalState="true"
+         checkForUnintentionallyCoveredCode="true">
   <php>
     <!-- Set error reporting to E_ALL. -->
     <ini name="error_reporting" value="32767"/>