public function testCommandReply()
 {
     $commandId1 = Uuid::uuid1()->toString();
     $commandId2 = Uuid::uuid1()->toString();
     $this->testSubject->writeCommandReply($commandId1, $commandId1);
     $data = $this->testSubject->readCommandReply($commandId1);
     $this->assertEquals($commandId1, $data[1]);
     $data = $this->testSubject->readCommandReply($commandId2, 1);
     $this->assertNull($data);
 }