/**
* Tests that form errors during submission throw an exception.
*
* @covers ::setErrorByName
*
* @expectedException \LogicException
* @expectedExceptionMessage Form errors cannot be set after form validation has finished.
*/
public function testFormErrorsDuringSubmission()
{
$form_state = new FormState();
$form_state->setValidationComplete();
$form_state->setErrorByName('test', 'message');
}