diff --git a/phpcs.xml.dist b/phpcs.xml.dist
index 9bf83ab..6fe3c5e 100644
--- a/phpcs.xml.dist
+++ b/phpcs.xml.dist
@@ -1,7 +1,10 @@
 <?xml version="1.0"?>
 <ruleset name="PSR12">
- <rule ref="PSR12"/>
- <rule ref="PSR1.Files.SideEffects.FoundWithSymbols">
-    <exclude-pattern>tests/bootstrap\.php</exclude-pattern>
-</rule>
+    <rule ref="PSR12"/>
+    <rule ref="PSR1.Files.SideEffects.FoundWithSymbols">
+        <exclude-pattern>tests/bootstrap\.php</exclude-pattern>
+    </rule>
+
+    <file>./src</file>
+    <file>./tests</file>
 </ruleset>
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 7713bfa..4318681 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -17,6 +17,10 @@
     }
 }
 
+if (!$autoloaded) {
+    throw new RuntimeException("Couldn't find autoloader");
+}
+
 if (!defined('PHP_CODESNIFFER_VERBOSITY')) {
     define('PHP_CODESNIFFER_VERBOSITY', 0);
 }