diff --git a/composer.json b/composer.json
index f52af3a..1d55140 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,8 @@
     "doctrine/orm": "^3.0",
     "doctrine/doctrine-bundle": "^2.13 || ^3.0",
     "symfony/translation": "^6.4 || ^7.0 || ^8.0",
-    "symfony/dependency-injection": "^6.4 || ^7.0 || ^8.0"
+    "symfony/dependency-injection": "^6.4 || ^7.0 || ^8.0",
+    "symfony/yaml": "^6.4 || ^7.0 || ^8.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^10.5",
@@ -23,7 +24,10 @@
     "phpstan/extension-installer": "^1.4",
     "phpstan/phpstan-symfony": "^2.0",
     "phpstan/phpstan-doctrine": "^2.0",
-    "friendsofphp/php-cs-fixer": "^3.95"
+    "friendsofphp/php-cs-fixer": "^3.95",
+    "symfony/framework-bundle": "^6.4 || ^7.0 || ^8.0",
+    "symfony/validator": "^6.4 || ^7.0 || ^8.0",
+    "api-platform/core": "^3.4 || ^4.0"
   },
   "prefer-stable": true,
   "autoload": {
diff --git a/tests/Fixtures/TestKernel.php b/tests/Fixtures/TestKernel.php
new file mode 100644
index 0000000..b57bdef
--- /dev/null
+++ b/tests/Fixtures/TestKernel.php
@@ -0,0 +1,76 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Locastic\ApiPlatformTranslationBundle\Tests\Fixtures;
+
+use ApiPlatform\Symfony\Bundle\ApiPlatformBundle;
+use Doctrine\Bundle\DoctrineBundle\DoctrineBundle;
+use Locastic\ApiPlatformTranslationBundle\ApiPlatformTranslationBundle;
+use Symfony\Bundle\FrameworkBundle\FrameworkBundle;
+use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+use Symfony\Component\HttpKernel\Kernel;
+
+final class TestKernel extends Kernel
+{
+    use MicroKernelTrait;
+
+    public function registerBundles(): iterable
+    {
+        return [
+            new FrameworkBundle(),
+            new DoctrineBundle(),
+            new ApiPlatformBundle(),
+            new ApiPlatformTranslationBundle(),
+        ];
+    }
+
+    public function getCacheDir(): string
+    {
+        return sys_get_temp_dir().'/aptb-tests/cache/'.$this->environment;
+    }
+
+    public function getLogDir(): string
+    {
+        return sys_get_temp_dir().'/aptb-tests/log';
+    }
+
+    protected function build(ContainerBuilder $container): void
+    {
+        // Keep the bundle services visible to the test; private unused
+        // services are otherwise inlined or removed during compilation.
+        $container->addCompilerPass(new class implements CompilerPassInterface {
+            public function process(ContainerBuilder $container): void
+            {
+                foreach ($container->getDefinitions() as $id => $definition) {
+                    if (str_starts_with($id, 'locastic_api_platform_translation.')) {
+                        $definition->setPublic(true);
+                    }
+                }
+            }
+        });
+    }
+
+    protected function configureContainer(ContainerConfigurator $container): void
+    {
+        $container->extension('framework', [
+            'secret' => 'test',
+            'test' => true,
+            'http_method_override' => false,
+            'validation' => ['enabled' => true],
+        ]);
+
+        $container->extension('doctrine', [
+            'dbal' => ['url' => 'sqlite:///:memory:'],
+        ]);
+
+        $container->extension('api_platform', [
+            'title' => 'Test',
+            'mapping' => ['paths' => []],
+            'doctrine' => false,
+        ]);
+    }
+}
diff --git a/tests/Functional/BundleInitializationTest.php b/tests/Functional/BundleInitializationTest.php
new file mode 100644
index 0000000..2eac886
--- /dev/null
+++ b/tests/Functional/BundleInitializationTest.php
@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Locastic\ApiPlatformTranslationBundle\Tests\Functional;
+
+use ApiPlatform\Serializer\Filter\GroupFilter;
+use Locastic\ApiPlatformTranslationBundle\EventListener\AssignLocaleListener;
+use Locastic\ApiPlatformTranslationBundle\Tests\Fixtures\TestKernel;
+use Locastic\ApiPlatformTranslationBundle\Translation\Translator;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+/**
+ * Boots a real kernel with FrameworkBundle, DoctrineBundle and ApiPlatformBundle
+ * to prove the container compiles and the bundle services are wired, in
+ * particular the translation.groups filter, which inherits from an
+ * api_platform service definition the unit tests never see.
+ */
+class BundleInitializationTest extends KernelTestCase
+{
+    protected static function getKernelClass(): string
+    {
+        return TestKernel::class;
+    }
+
+    public function testContainerCompilesAndRegistersServices(): void
+    {
+        self::bootKernel();
+        $container = static::getContainer();
+
+        $this->assertInstanceOf(
+            Translator::class,
+            $container->get('locastic_api_platform_translation.translation.translator')
+        );
+        $this->assertInstanceOf(
+            AssignLocaleListener::class,
+            $container->get('locastic_api_platform_translation.listener.assign_locale')
+        );
+        $this->assertInstanceOf(
+            GroupFilter::class,
+            $container->get('locastic_api_platform_translation.filter.translation_groups')
+        );
+    }
+}
diff --git a/tests/Model/TranslatableTraitTest.php b/tests/Model/TranslatableTraitTest.php
index ea22f2b..ee8b13e 100644
--- a/tests/Model/TranslatableTraitTest.php
+++ b/tests/Model/TranslatableTraitTest.php
@@ -89,6 +89,81 @@ public function testGetTranslationWithoutLocales(): void
         $dummyTranslatable->getTranslation();
     }
 
+    /**
+     * @test getTranslation
+     */
+    public function testGetTranslationCreatesAndAddsMissingTranslation(): void
+    {
+        $dummyTranslatable = $this->setTranslatable('es', 'en');
+        $this->assertCount(0, $dummyTranslatable->getTranslations());
+
+        $translation = $dummyTranslatable->getTranslation('fr');
+
+        $this->assertSame('fr', $translation->getLocale());
+        $this->assertSame($dummyTranslatable, $translation->getTranslatable());
+        $this->assertCount(1, $dummyTranslatable->getTranslations());
+    }
+
+    /**
+     * @test hasTranslation
+     */
+    public function testHasTranslation(): void
+    {
+        $dummyTranslatable = $this->setTranslatable('es', 'en');
+        $english = $this->setTranslation('en', 'english', $dummyTranslatable);
+
+        $notAdded = new DummyTranslation();
+        $notAdded->setLocale('fr');
+
+        $this->assertTrue($dummyTranslatable->hasTranslation($english));
+        $this->assertFalse($dummyTranslatable->hasTranslation($notAdded));
+    }
+
+    /**
+     * @test addTranslation
+     */
+    public function testAddTranslationIgnoresTranslationWithoutLocale(): void
+    {
+        $dummyTranslatable = $this->setTranslatable('es', 'en');
+
+        $translation = new DummyTranslation();
+        $dummyTranslatable->addTranslation($translation);
+
+        $this->assertCount(0, $dummyTranslatable->getTranslations());
+        $this->assertNull($translation->getTranslatable());
+    }
+
+    /**
+     * @test addTranslation
+     */
+    public function testAddTranslationIgnoresDuplicateLocale(): void
+    {
+        $dummyTranslatable = $this->setTranslatable('es', 'en');
+        $this->setTranslation('en', 'english', $dummyTranslatable);
+
+        $duplicate = new DummyTranslation();
+        $duplicate->setLocale('en');
+        $duplicate->setTranslation('english again');
+        $dummyTranslatable->addTranslation($duplicate);
+
+        $this->assertCount(1, $dummyTranslatable->getTranslations());
+        $this->assertSame('english', $dummyTranslatable->getTranslation('en')->getTranslation());
+    }
+
+    /**
+     * @test removeTranslationWithLocale
+     */
+    public function testRemoveTranslationWithLocale(): void
+    {
+        $dummyTranslatable = $this->setTranslatable('es', 'en');
+        $this->setTranslation('en', 'english', $dummyTranslatable);
+        $this->setTranslation('es', 'espanol', $dummyTranslatable);
+
+        $dummyTranslatable->removeTranslationWithLocale('en');
+
+        $this->assertSame(['es'], array_values($dummyTranslatable->getTranslationLocales()));
+    }
+
     /**
      * @param TranslatableInterface<DummyTranslation> $translatable
      */
diff --git a/tests/Translation/TranslatorTest.php b/tests/Translation/TranslatorTest.php
index dfbc732..7bbd897 100644
--- a/tests/Translation/TranslatorTest.php
+++ b/tests/Translation/TranslatorTest.php
@@ -220,5 +220,7 @@ public function provideLocalesWithAcceptLanguage(): \Generator
         yield [null, null, 'en'];
         yield [null, 'fr_FR', 'fr'];
         yield [null, 'es', 'en']; // Accept-Language locale not enabled
+        yield [null, 'it;q=0.4, fr;q=0.9', 'fr']; // Quality values respected
+        yield [null, 'fr;q=0.3, it;q=0.9', 'it'];
     }
 }