flush() public method

Remove messages from this container.
public flush ( string $severity = null ) : void
$severity string severity of messages (from Message::SEVERITY_* constants) to remove.
return void
 /**
  * @test
  */
 public function flushResetsFlashMessages()
 {
     $message1 = new FlowError\Message('This is a test message');
     $this->flashMessageContainer->addMessage($message1);
     $this->flashMessageContainer->flush();
     $this->assertEquals([], $this->flashMessageContainer->getMessages());
 }