Add tests for the legacy tokens

common/tests/fixtures/LegacyOauthRefreshTokenFixture.php

@@ -0,0 +1,14 @@
+<?php
+declare(strict_types=1);
+
+namespace common\tests\fixtures;
+
+use common\tests\_support\Redis\Fixture;
+
+class LegacyOauthRefreshTokenFixture extends Fixture {
+
+    public $dataFile = '@root/common/tests/fixtures/data/legacy-oauth-refresh-tokens.php';
+
+    public $keysPrefix = 'oauth:refresh:tokens:';
+
+}