diff --git a/phpunit.xml b/phpunit.xml
index 92dc5a5b..bdc4b0b6 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -14,7 +14,6 @@
     <filter>
         <whitelist>
             <directory>./include/</directory>
-            <directory>./public/</directory>
             <directory>./src/</directory>
         </whitelist>
     </filter>
diff --git a/tests/Unit/Container/ContainerTest.php b/tests/Unit/Container/ContainerTest.php
index f0ba24e7..89c34209 100644
--- a/tests/Unit/Container/ContainerTest.php
+++ b/tests/Unit/Container/ContainerTest.php
@@ -85,6 +85,12 @@ class ContainerTest extends TestCase
      */
     public function testContainerSingleton()
     {
+        // Ensure that no container has been initialized
+        $reflection = new \ReflectionProperty(Container::class, 'instance');
+        $reflection->setAccessible(true);
+        $reflection->setValue(null, null);
+        $reflection->setAccessible(false);
+
         $container0 = new Container();
         $container = Container::getInstance();