diff --git a/tests/Fixtures/ConfigurationBundle/DependencyInjection/Compiler/DeregisterSomethingPass.php b/tests/Fixtures/ConfigurationBundle/DependencyInjection/Compiler/DeregisterSomethingPass.php
new file mode 100644
index 0000000..250f8dd
--- /dev/null
+++ b/tests/Fixtures/ConfigurationBundle/DependencyInjection/Compiler/DeregisterSomethingPass.php
@@ -0,0 +1,17 @@
+<?php
+declare(strict_types=1);
+
+namespace Fixtures\ConfigurationBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+final class DeregisterSomethingPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container): void
+    {
+        if ($container->hasDefinition('something')) {
+            $container->removeDefinition('something');
+        }
+    }
+}
diff --git a/tests/Fixtures/ConfigurationBundle/DependencyInjection/Compiler/RegisterSomethingPass.php b/tests/Fixtures/ConfigurationBundle/DependencyInjection/Compiler/RegisterSomethingPass.php
new file mode 100644
index 0000000..25bf8b2
--- /dev/null
+++ b/tests/Fixtures/ConfigurationBundle/DependencyInjection/Compiler/RegisterSomethingPass.php
@@ -0,0 +1,24 @@
+<?php
+declare(strict_types=1);
+
+namespace Fixtures\ConfigurationBundle\DependencyInjection\Compiler;
+
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+
+final class RegisterSomethingPass implements CompilerPassInterface
+{
+    public function process(ContainerBuilder $container): void
+    {
+        if ($container->hasDefinition('something')) {
+            return;
+        }
+
+        $definition = new Definition();
+        $definition->setClass(\stdClass::class);
+        $definition->setPublic(true);
+
+        $container->setDefinition('something', $definition);
+    }
+}
diff --git a/tests/Functional/CompilerPassTest.php b/tests/Functional/CompilerPassTest.php
new file mode 100644
index 0000000..a0e8d29
--- /dev/null
+++ b/tests/Functional/CompilerPassTest.php
@@ -0,0 +1,44 @@
+<?php
+declare(strict_types=1);
+
+namespace Functional;
+
+use Fixtures\ConfigurationBundle\DependencyInjection\Compiler\DeregisterSomethingPass;
+use Fixtures\ConfigurationBundle\DependencyInjection\Compiler\RegisterSomethingPass;
+use Neusta\Pimcore\TestingFramework\Kernel\TestKernel;
+use Neusta\Pimcore\TestingFramework\Test\ConfigurableKernelTestCase;
+use Symfony\Component\DependencyInjection\Compiler\PassConfig;
+
+final class CompilerPassTest extends ConfigurableKernelTestCase
+{
+    /**
+     * @test
+     */
+    public function compiler_pass_priority(): void
+    {
+        // Case 1: Compiler pass without priority - it should be prioritized by order of addition
+        self::bootKernel(['config' => function (TestKernel $kernel) {
+            $kernel->addTestCompilerPass(new DeregisterSomethingPass());
+            $kernel->addTestCompilerPass(new RegisterSomethingPass());
+        }]);
+
+        $this->assertTrue(self::getContainer()->has('something'));
+
+        // Case 2: Compiler pass with priority - it should be prioritized by priority
+        self::bootKernel(['config' => function (TestKernel $kernel) {
+            $kernel->addTestCompilerPass(new DeregisterSomethingPass(), PassConfig::TYPE_BEFORE_OPTIMIZATION, -5);
+            $kernel->addTestCompilerPass(new RegisterSomethingPass());
+        }]);
+
+        $this->assertFalse(self::getContainer()->has('something'));
+
+        // Case 3: Compiler pass without priority - it should be prioritized by order of addition
+        self::bootKernel(['config' => function (TestKernel $kernel) {
+            // DeregisterSomethingPass is now added as second compiler pass
+            $kernel->addTestCompilerPass(new RegisterSomethingPass());
+            $kernel->addTestCompilerPass(new DeregisterSomethingPass());
+        }]);
+
+        $this->assertFalse(self::getContainer()->has('something'));
+    }
+}