public function testRegister()
 {
     $this->commandDispatcher->expects($this->once())->method('register')->willReturn(null);
     $this->commandEventDispatcher->register(new TestCommandHandlerOne());
 }
 /**
  * Register a CommandHandler for one or more Command.
  *
  * @param CommandHandlerInterface $handler
  *
  * @return void
  */
 public function register(CommandHandlerInterface $handler)
 {
     $this->commandDispatcher->register($handler);
 }