fix(testing): always clear cache in integration test's tearDown (#3818)

This prevent tests from interacting between each other through the cache.

Author: n-peugnet

php-packages/testing/src/integration/TestCase.php

@@ -16,6 +16,7 @@
 use Flarum\Testing\integration\Extend\BeginTransactionAndSetDatabase;
 use Flarum\Testing\integration\Extend\OverrideExtensionManagerForTests;
 use Flarum\Testing\integration\Extend\SetSettingsBeforeBoot;
+use Illuminate\Contracts\Cache\Store;
 use Illuminate\Database\ConnectionInterface;
 use Illuminate\Support\Arr;
 use Laminas\Diactoros\ServerRequest;
@@ -36,6 +37,7 @@ protected function tearDown(): void
         parent::tearDown();
 
         $this->database()->rollBack();
+        $this->app()->getContainer()->make(Store::class)->flush();
     }
 
     /**