public function testhandleTranserEncoding()
 {
     $inboundEmail = new InboundEmail();
     $this->assertEquals('test', $inboundEmail->handleTranserEncoding('test'));
     $this->assertEquals('test', $inboundEmail->handleTranserEncoding('dGVzdA==', 3));
     $this->assertEquals('test', $inboundEmail->handleTranserEncoding('test', 4));
 }