TestCase: removed NULL byte from class names, thx @smuuf [Closes #450][…

…Closes #449]

get_debug_type() does not output a null byte for anonymous classes

src/Framework/TestCase.php

@@ -214,7 +214,7 @@ private function sendMethodList(array $methods): void
 		Environment::$checkAssertions = false;
 		header('Content-Type: text/plain');
 		echo "\n";
-		echo 'TestCase:' . static::class . "\n";
+		echo 'TestCase:' . get_debug_type($this) . "\n";
 		echo 'Method:' . implode("\nMethod:", $methods) . "\n";
 
 		$dependentFiles = [];