Prevent global side-effect in Bug13813IntegrationTest

Author: staabm

tests/PHPStan/Analyser/Bug13813IntegrationTest.php

@@ -17,11 +17,17 @@ class Bug13813IntegrationTest extends PHPStanTestCase
 
 	public function testBug13813(): void
 	{
-		error_reporting(E_ALL);
-		$analyzerResult = $this->runAnalyse([
-			__DIR__ . '/data/bug-13813.php',
-			__DIR__ . '/Bug13813Rule.php',
-		]);
+		$oldReporting = error_reporting();
+
+		try {
+			error_reporting(E_ALL);
+			$analyzerResult = $this->runAnalyse([
+				__DIR__ . '/data/bug-13813.php',
+				__DIR__ . '/Bug13813Rule.php',
+			]);
+		} finally {
+			error_reporting($oldReporting);
+		}
 		$this->assertCount(2, $analyzerResult->getAllPhpErrors());
 		$this->assertCount(2, $analyzerResult->getFilteredPhpErrors());