fixed wrong test

tests/MessageTest.php

@@ -1076,11 +1076,11 @@ public function testUndefinedCharset(): void
 
         $headers = $message->getHeaders();
 
-        static::assertGreaterThan(3, \count($headers));
-
-        static::assertArrayHasKey('from', $headers);
-        static::assertArrayHasKey('to', $headers);
-        static::assertArrayHasKey('date', $headers);
+        static::assertCount(1,$message->getTo());
+        static::assertSame('<[email protected]>', $headers['message_id']);
         static::assertArrayNotHasKey('subject', $headers);
+        static::assertArrayNotHasKey('from', $headers);
+        static::assertNull($message->getSubject());
+        static::assertNull($message->getFrom());
     }
 }

tests/fixtures/undefined_charset_header.eml

@@ -7,7 +7,6 @@ Received: from <[email protected]>
 X-Autogenerated: Mirror
 Resent-From: <[email protected]>
 Resent-Date: Mon, 27 Feb 2017 13:21:44 +0930
-
 Message-Id: <[email protected]>
 From: =?X-IAS-German?B?bXlHb3Y=?=<[email protected]>
 To: [email protected]