diff --git a/tests/lib/Repository/Values/Translation/MessageTest.php b/tests/lib/Repository/Values/Translation/MessageTest.php
new file mode 100644
index 0000000000..278847cb4b
--- /dev/null
+++ b/tests/lib/Repository/Values/Translation/MessageTest.php
@@ -0,0 +1,61 @@
+<?php
+
+/**
+ * @copyright Copyright (C) Ibexa AS. All rights reserved.
+ * @license For full copyright and license information view LICENSE file distributed with this source code.
+ */
+declare(strict_types=1);
+
+namespace Ibexa\Tests\Core\Repository\Values\Translation;
+
+use Ibexa\Contracts\Core\Repository\Values\Translation\Message;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \Ibexa\Contracts\Core\Repository\Values\Translation\Message
+ */
+final class MessageTest extends TestCase
+{
+    /**
+     * @dataProvider getDataForTestStringable
+     */
+    public function testStringable(Message $message, string $expectedString): void
+    {
+        self::assertSame($expectedString, (string)$message);
+    }
+
+    /**
+     * @return array<string, array{\Ibexa\Contracts\Core\Repository\Values\Translation\Message, string}>
+     */
+    public static function getDataForTestStringable(): iterable
+    {
+        yield 'message with substitution values' => [
+            new Message(
+                'Anna has some oranges in %object%',
+                [
+                    '%object%' => 'a basket',
+                ]
+            ),
+            'Anna has some oranges in a basket',
+        ];
+
+        yield 'message with multiple substitution values' => [
+            new Message(
+                '%first_name% has some data in %storage_type%',
+                [
+                    '%first_name%' => 'Anna',
+                    '%storage_type%' => 'her database',
+                ]
+            ),
+            'Anna has some data in her database',
+        ];
+
+        yield 'message with no substitution values' => [
+            new Message(
+                'This value is not correct',
+                []
+            ),
+            'This value is not correct',
+        ];
+    }
+}
diff --git a/tests/lib/Repository/Values/Translation/PluralTest.php b/tests/lib/Repository/Values/Translation/PluralTest.php
new file mode 100644
index 0000000000..d0d6e57f96
--- /dev/null
+++ b/tests/lib/Repository/Values/Translation/PluralTest.php
@@ -0,0 +1,63 @@
+<?php
+
+/**
+ * @copyright Copyright (C) Ibexa AS. All rights reserved.
+ * @license For full copyright and license information view LICENSE file distributed with this source code.
+ */
+declare(strict_types=1);
+
+namespace Ibexa\Tests\Core\Repository\Values\Translation;
+
+use Ibexa\Contracts\Core\Repository\Values\Translation\Plural;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \Ibexa\Contracts\Core\Repository\Values\Translation\Plural
+ */
+final class PluralTest extends TestCase
+{
+    /**
+     * @dataProvider getDataForTestStringable
+     */
+    public function testStringable(Plural $message, string $expectedString): void
+    {
+        self::assertSame($expectedString, (string)$message);
+    }
+
+    /**
+     * @return array<string, array{\Ibexa\Contracts\Core\Repository\Values\Translation\Plural, string}>
+     */
+    public static function getDataForTestStringable(): iterable
+    {
+        yield 'singular form' => [
+            new Plural(
+                'John has %apple_count% apple',
+                'John has %apple_count% apples',
+                [
+                    '%apple_count%' => 1,
+                ]
+            ),
+            'John has 1 apple',
+        ];
+
+        yield 'plural form' => [
+            new Plural(
+                'John has %apple_count% apple',
+                'John has %apple_count% apples',
+                [
+                    '%apple_count%' => 2,
+                ]
+            ),
+            'John has 2 apples',
+        ];
+
+        yield 'no substitution values' => [
+            new Plural(
+                'John has some apples',
+                'John has a lot of apples',
+                []
+            ),
+            'John has a lot of apples',
+        ];
+    }
+}