add HttpEventListener test (#200)

tests/TestCase.php

@@ -4,24 +4,12 @@ declare(strict_types=1);
 
 namespace Tests;
 
-use Prophecy\Prophet;
+use Prophecy\PhpUnit\ProphecyTrait;
 
 /**
  * @internal
  */
 class TestCase extends \PHPUnit\Framework\TestCase
 {
-    protected Prophet $prophet;
-
-    protected function setUp(): void
-    {
-        parent::setUp();
-        $this->prophet = new Prophet();
-    }
-
-    protected function tearDown(): void
-    {
-        parent::tearDown();
-        $this->prophet->checkPredictions();
-    }
+    use ProphecyTrait;
 }