diff --git a/composer.json b/composer.json
index a9b60f12..159d64bd 100644
--- a/composer.json
+++ b/composer.json
@@ -92,6 +92,7 @@
             "ShlinkioCliTest\\Shlink\\CLI\\": "module/CLI/test-cli",
             "ShlinkioTest\\Shlink\\Rest\\": "module/Rest/test",
             "ShlinkioApiTest\\Shlink\\Rest\\": "module/Rest/test-api",
+            "ShlinkioDbTest\\Shlink\\Rest\\": "module/Rest/test-db",
             "ShlinkioTest\\Shlink\\Core\\": "module/Core/test",
             "ShlinkioDbTest\\Shlink\\Core\\": "module/Core/test-db"
         },
diff --git a/module/Rest/test-db/ApiKey/Repository/ApiKeyRepositoryTest.php b/module/Rest/test-db/ApiKey/Repository/ApiKeyRepositoryTest.php
new file mode 100644
index 00000000..ae6ab0a0
--- /dev/null
+++ b/module/Rest/test-db/ApiKey/Repository/ApiKeyRepositoryTest.php
@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ShlinkioDbTest\Shlink\Rest\ApiKey\Repository;
+
+use Shlinkio\Shlink\Rest\ApiKey\Repository\ApiKeyRepository;
+use Shlinkio\Shlink\Rest\Entity\ApiKey;
+use Shlinkio\Shlink\TestUtils\DbTest\DatabaseTestCase;
+
+class ApiKeyRepositoryTest extends DatabaseTestCase
+{
+    private ApiKeyRepository $repo;
+
+    protected function setUp(): void
+    {
+        $this->repo = $this->getEntityManager()->getRepository(ApiKey::class);
+    }
+
+    /** @test */
+    public function initialApiKeyIsCreatedOnlyOfNoApiKeysExistYet(): void
+    {
+        self::assertCount(0, $this->repo->findAll());
+        $this->repo->createInitialApiKey('initial_value');
+        self::assertCount(1, $this->repo->findAll());
+        self::assertCount(1, $this->repo->findBy(['key' => 'initial_value']));
+        $this->repo->createInitialApiKey('another_one');
+        self::assertCount(1, $this->repo->findAll());
+        self::assertCount(0, $this->repo->findBy(['key' => 'another_one']));
+    }
+}