Symfony\Component\Form\Tests\CompoundFormTest::testSubmitSupportsDynamicAdditionAndRemovalOfChildren PHP Method

    public function testSubmitSupportsDynamicAdditionAndRemovalOfChildren()
    {
        $child = $this->getMockForm('child');
        $childToBeRemoved = $this->getMockForm('removed');
        $childToBeAdded = $this->getMockForm('added');

        $this->form->add($child);
        $this->form->add($childToBeRemoved);

        $form = $this->form;

        $child->expects($this->once())
            ->method('submit')
            ->will($this->returnCallback(function () use ($form, $childToBeAdded) {
                $form->remove('removed');
                $form->add($childToBeAdded);
            }));

        $childToBeRemoved->expects($this->never())
            ->method('submit');

        $childToBeAdded->expects($this->once())
            ->method('submit');

        // pass NULL to all children
        $this->form->submit(array());
    }