diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index f18476f..15984eb 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -1,5 +1,10 @@
 <?xml version="1.0"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" colors="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+	<coverage>
+		<include>
+			<directory suffix=".php">../../src</directory>
+		</include>
+	</coverage>
 	<testsuites>
 		<testsuite name="main">
 			<directory suffix="Test.php">.</directory>