public function testGetPrettyFlowMessage()
{
$message = new Message();
$message->setFlowMessage('{"example flow: ""}');
$this->assertNull($message->getPrettyFlowMessage());
$flowMessage = ['a' => array('some-key-1' => 'some-value-1'), 'b' => array('some-key-1' => 'some-value-2')];
$message->setFlowMessage(json_encode($flowMessage));
$this->assertEquals(json_encode($flowMessage, JSON_PRETTY_PRINT), $message->getPrettyFlowMessage());
}