testValidationGroupsCanBeSetToCallback example

        $form = $this->createForm([
            'validation_groups' => false,
        ]);

        $this->assertEquals([], $form->getConfig()->getOption('validation_groups'));
    }

    public function testValidationGroupsCanBeSetToCallback()
    {
        $form = $this->createForm([
            'validation_groups' => $this->testValidationGroupsCanBeSetToCallback(...),
        ]);

        $this->assertIsCallable($form->getConfig()->getOption('validation_groups'));
    }

    public function testValidationGroupsCanBeSetToClosure()
    {
        $form = $this->createForm([
            'validation_groups' => function DFormInterface $form) { },
        ]);