fix namespaces and references

tests/Unit/RateLimiterTest.php

@@ -1,6 +1,8 @@
 <?php
+namespace Tests\Unit;
+
 use PHPUnit\Framework\TestCase;
-use Core\RateLimiter\FileRateLimiter;
+use Api\Core\RateLimiter\FileRateLimiter;
 
 final class RateLimiterTest extends TestCase {
     private $dir;

tests/Unit/SomeControllerTest.php

@@ -1,7 +1,8 @@
 <?php
+namespace Tests\Unit;
+
 use PHPUnit\Framework\TestCase;
-use Core\RateLimiter\RateLimiterInterface;
-use Core\RateLimiter\InMemoryRateLimiter;
+use Api\Core\RateLimiter\InMemoryRateLimiter;
 
 final class SomeControllerTest extends TestCase {
     public function testRateLimitedPath() {