diff --git a/src/Component/spec/Translation/Provider/ImmutableTranslationLocaleProviderSpec.php b/src/Component/spec/Translation/Provider/ImmutableTranslationLocaleProviderSpec.php
deleted file mode 100644
index eb21a8310..000000000
--- a/src/Component/spec/Translation/Provider/ImmutableTranslationLocaleProviderSpec.php
+++ /dev/null
@@ -1,40 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Sylius Sp. z o.o.
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-
-namespace spec\Sylius\Resource\Translation\Provider;
-
-use PhpSpec\ObjectBehavior;
-use Sylius\Resource\Translation\Provider\TranslationLocaleProviderInterface;
-
-final class ImmutableTranslationLocaleProviderSpec extends ObjectBehavior
-{
-    function let(): void
-    {
-        $this->beConstructedWith(['pl_PL', 'en_US'], 'pl_PL');
-    }
-
-    function it_implements_translation_locale_provider_interface(): void
-    {
-        $this->shouldImplement(TranslationLocaleProviderInterface::class);
-    }
-
-    function it_returns_defined_locales_codes(): void
-    {
-        $this->getDefinedLocalesCodes()->shouldReturn(['pl_PL', 'en_US']);
-    }
-
-    function it_returns_the_default_locale_code(): void
-    {
-        $this->getDefaultLocaleCode()->shouldReturn('pl_PL');
-    }
-}
diff --git a/src/Component/spec/Translation/TranslatableEntityLocaleAssignerSpec.php b/src/Component/spec/Translation/TranslatableEntityLocaleAssignerSpec.php
deleted file mode 100644
index f42abf0c8..000000000
--- a/src/Component/spec/Translation/TranslatableEntityLocaleAssignerSpec.php
+++ /dev/null
@@ -1,44 +0,0 @@
-<?php
-
-/*
- * This file is part of the Sylius package.
- *
- * (c) Sylius Sp. z o.o.
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-declare(strict_types=1);
-
-namespace spec\Sylius\Resource\Translation;
-
-use PhpSpec\ObjectBehavior;
-use Sylius\Resource\Model\TranslatableInterface;
-use Sylius\Resource\Translation\Provider\TranslationLocaleProviderInterface;
-use Sylius\Resource\Translation\TranslatableEntityLocaleAssignerInterface;
-
-final class TranslatableEntityLocaleAssignerSpec extends ObjectBehavior
-{
-    function let(TranslationLocaleProviderInterface $translationLocaleProvider): void
-    {
-        $this->beConstructedWith($translationLocaleProvider);
-    }
-
-    function it_implements_traslatable_entity_locale_assigner_interface(): void
-    {
-        $this->shouldImplement(TranslatableEntityLocaleAssignerInterface::class);
-    }
-
-    function it_should_assign_current_and_default_locale_to_given_translatable_entity(
-        TranslationLocaleProviderInterface $translationLocaleProvider,
-        TranslatableInterface $translatableEntity,
-    ): void {
-        $translationLocaleProvider->getDefaultLocaleCode()->willReturn('en_US');
-
-        $translatableEntity->setCurrentLocale('en_US')->shouldBeCalled();
-        $translatableEntity->setFallbackLocale('en_US')->shouldBeCalled();
-
-        $this->assignLocale($translatableEntity);
-    }
-}
diff --git a/src/Component/tests/Translation/Provider/ImmutableTranslationLocaleProviderTest.php b/src/Component/tests/Translation/Provider/ImmutableTranslationLocaleProviderTest.php
new file mode 100644
index 000000000..092cb8a6d
--- /dev/null
+++ b/src/Component/tests/Translation/Provider/ImmutableTranslationLocaleProviderTest.php
@@ -0,0 +1,43 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Sylius Sp. z o.o.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Sylius\Resource\Tests\Translation\Provider;
+
+use PHPUnit\Framework\TestCase;
+use Sylius\Resource\Translation\Provider\ImmutableTranslationLocaleProvider;
+use Sylius\Resource\Translation\Provider\TranslationLocaleProviderInterface;
+
+final class ImmutableTranslationLocaleProviderTest extends TestCase
+{
+    private ImmutableTranslationLocaleProvider $localeProvider;
+
+    protected function setUp(): void
+    {
+        $this->localeProvider = new ImmutableTranslationLocaleProvider(['pl_PL', 'en_US'], 'pl_PL');
+    }
+
+    public function testItImplementsTranslationLocaleProviderInterface(): void
+    {
+        $this->assertInstanceOf(TranslationLocaleProviderInterface::class, $this->localeProvider);
+    }
+
+    public function testItReturnsDefinedLocalesCodes(): void
+    {
+        $this->assertSame(['pl_PL', 'en_US'], $this->localeProvider->getDefinedLocalesCodes());
+    }
+
+    public function testItReturnsTheDefaultLocaleCode(): void
+    {
+        $this->assertSame('pl_PL', $this->localeProvider->getDefaultLocaleCode());
+    }
+}
diff --git a/src/Component/tests/Translation/TranslatableEntityLocaleAssignerTest.php b/src/Component/tests/Translation/TranslatableEntityLocaleAssignerTest.php
new file mode 100644
index 000000000..dd3f1e870
--- /dev/null
+++ b/src/Component/tests/Translation/TranslatableEntityLocaleAssignerTest.php
@@ -0,0 +1,57 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Sylius Sp. z o.o.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Sylius\Resource\Tests\Translation;
+
+use PHPUnit\Framework\TestCase;
+use Sylius\Resource\Model\TranslatableInterface;
+use Sylius\Resource\Translation\Provider\TranslationLocaleProviderInterface;
+use Sylius\Resource\Translation\TranslatableEntityLocaleAssigner;
+use Sylius\Resource\Translation\TranslatableEntityLocaleAssignerInterface;
+
+final class TranslatableEntityLocaleAssignerTest extends TestCase
+{
+    private TranslationLocaleProviderInterface $translationLocaleProvider;
+
+    private TranslatableEntityLocaleAssigner $localeAssigner;
+
+    protected function setUp(): void
+    {
+        $this->translationLocaleProvider = $this->createMock(TranslationLocaleProviderInterface::class);
+        $this->localeAssigner = new TranslatableEntityLocaleAssigner($this->translationLocaleProvider);
+    }
+
+    public function testItImplementsTranslatableEntityLocaleAssignerInterface(): void
+    {
+        $this->assertInstanceOf(TranslatableEntityLocaleAssignerInterface::class, $this->localeAssigner);
+    }
+
+    public function testItAssignsCurrentAndDefaultLocaleToGivenTranslatableEntity(): void
+    {
+        $translatableEntity = $this->createMock(TranslatableInterface::class);
+
+        $this->translationLocaleProvider
+            ->method('getDefaultLocaleCode')
+            ->willReturn('en_US');
+
+        $translatableEntity->expects($this->once())
+            ->method('setCurrentLocale')
+            ->with('en_US');
+
+        $translatableEntity->expects($this->once())
+            ->method('setFallbackLocale')
+            ->with('en_US');
+
+        $this->localeAssigner->assignLocale($translatableEntity);
+    }
+}