Resolves #2. Implemented authlib-injector support

api/tests/functional/authlibInjector/HasJoinedCest.php

@@ -0,0 +1,52 @@
+<?php
+declare(strict_types=1);
+
+namespace api\tests\functional\authlibInjector;
+
+use api\tests\functional\_steps\SessionServerSteps;
+use api\tests\FunctionalTester;
+use function Ramsey\Uuid\v4 as uuid;
+
+class HasJoinedCest {
+
+    public function hasJoined(SessionServerSteps $I) {
+        $I->wantTo('check hasJoined user to some server');
+        [$username, $serverId] = $I->amJoined();
+
+        $I->sendGET('/api/authlib-injector/sessionserver/session/minecraft/hasJoined', [
+            'username' => $username,
+            'serverId' => $serverId,
+        ]);
+
+        $I->seeResponseCodeIs(200);
+        $I->canSeeValidTexturesResponse($username, 'df936908b2e1544d96f82977ec213022', true);
+    }
+
+    public function wrongArguments(FunctionalTester $I) {
+        $I->wantTo('get error on wrong amount of arguments');
+        $I->sendGET('/api/authlib-injector/sessionserver/session/minecraft/hasJoined', [
+            'wrong' => 'argument',
+        ]);
+        $I->canSeeResponseCodeIs(400);
+        $I->canSeeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            'error' => 'IllegalArgumentException',
+            'errorMessage' => 'credentials can not be null.',
+        ]);
+    }
+
+    public function hasJoinedWithNoJoinOperation(FunctionalTester $I) {
+        $I->wantTo('hasJoined to some server without join call');
+        $I->sendGET('/api/authlib-injector/sessionserver/session/minecraft/hasJoined', [
+            'username' => 'some-username',
+            'serverId' => uuid(),
+        ]);
+        $I->seeResponseCodeIs(401);
+        $I->seeResponseIsJson();
+        $I->canSeeResponseContainsJson([
+            'error' => 'ForbiddenOperationException',
+            'errorMessage' => 'Invalid token.',
+        ]);
+    }
+
+}