diff --git a/phpunit.xml b/phpunit.xml
index 1d3da08..b065af3 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -1,10 +1,18 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="./vendor/autoload.php" colors="true">
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="true">
     <filter>
         <whitelist processUncoveredFilesFromWhitelist="true">
             <directory suffix=".php">./src</directory>
             <exclude>
-                <directory suffix=".php">./tests</directory>
+                <directory suffix="Test.php">./tests</directory>
             </exclude>
         </whitelist>
     </filter>