diff --git a/tests/Support/InMemoryKeySet.php b/tests/Support/InMemoryKeySet.php
index 1bbe000..92ec55e 100644
--- a/tests/Support/InMemoryKeySet.php
+++ b/tests/Support/InMemoryKeySet.php
@@ -18,19 +18,6 @@ final class InMemoryKeySet implements KeySet
      */
     public function __construct(private array $keys = []) {}
 
-    /**
-     * @param non-empty-string $id
-     */
-    public function addKey(string $id, Key $key): void
-    {
-        $this->keys[$id] = $key;
-    }
-
-    public function callsToFindByKeyId(): int
-    {
-        return $this->invocations;
-    }
-
     public function findKeyById(string $id): Key
     {
         ++$this->invocations;
diff --git a/tests/Support/ServiceAccount.php b/tests/Support/ServiceAccount.php
deleted file mode 100644
index 5f579b2..0000000
--- a/tests/Support/ServiceAccount.php
+++ /dev/null
@@ -1,43 +0,0 @@
-<?php
-
-namespace Beste\Firebase\JWT\Tests\Support;
-
-/**
- * @internal
- */
-final readonly class ServiceAccount
-{
-    /**
-     * @param non-empty-string $privateKey
-     * @param non-empty-string $clientEmail
-     * @param non-empty-string $projectId
-     */
-    private function __construct(
-        public string $privateKey,
-        public string $clientEmail,
-        public string $projectId,
-    ) {}
-
-    /**
-     * @param non-empty-string $path
-     */
-    public static function fromFile(string $path): self
-    {
-        $contents = file_get_contents($path);
-        assert(is_string($contents) && $contents !== '');
-
-        $json = json_decode($contents, true);
-        assert(is_array($json));
-
-        $privateKey = $json['private_key'] ?? '';
-        assert(is_string($privateKey) && $privateKey !== '');
-
-        $clientEmail = $json['client_email'] ?? '';
-        assert(is_string($clientEmail) && $clientEmail !== '');
-
-        $projectId = $json['project_id'] ?? '';
-        assert(is_string($projectId) && $projectId !== '');
-
-        return new self(privateKey: $privateKey, clientEmail: $clientEmail, projectId: $projectId);
-    }
-}
diff --git a/tests/Support/TestTokenBuilder.php b/tests/Support/TestTokenBuilder.php
deleted file mode 100644
index 3ad8a77..0000000
--- a/tests/Support/TestTokenBuilder.php
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-
-namespace Beste\Firebase\JWT\Tests\Support;
-
-/**
- * @internal
- */
-final class TestTokenBuilder
-{
-    public function __construct() {}
-}