如何对表单进行单元测试

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// tests/Form/Type/TestedTypeTest.php
namespace App\Tests\Form\Type;

use App\Form\Type\TestedType;
use App\Model\TestObject;
use Symfony\Component\Form\Test\TypeTestCase;

class TestedTypeTest extends TypeTestCase
{
    public function testSubmitValidData(): void
    {
        $formData = [
            'test' => 'test',
            'test2' => 'test2',
        ];

        $model = new TestObject();
        // $model will retrieve data from the form submission; pass it as the second argument
        $form = $this->factory->create(TestedType::class, $model);

        $expected = new TestObject();
        // ...populate $expected properties with the data stored in $formData

        // submit the data to the form directly
        $form->submit($formData);

        // This check ensures there are no transformation failures
        $this->assertTrue($form->isSynchronized());

        // check that $model was modified as expected when the form was submitted
        $this->assertEquals($expected, $model);
    }

    public function testCustomFormView(): void
    {
        $formData = new TestObject();
        // ... prepare the data as you need

        // The initial data may be used to compute custom view variables
        $view = $this->factory->create(TestedType::class, $formData)
            ->createView();

        $this->assertArrayHasKey('custom_var', $view->vars);
        $this->assertSame('expected value', $view->vars['custom_var']);
    }
}

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// tests/Form/Type/TestedTypeTest.php
namespace App\Tests\Form\Type;

use App\Form\Type\TestedType;
use Doctrine\ORM\EntityManager;
use Symfony\Component\Form\PreloadedExtension;
use Symfony\Component\Form\Test\TypeTestCase;
// ...

class TestedTypeTest extends TypeTestCase
{
    private MockObject&EntityManager $entityManager;

    protected function setUp(): void
    {
        // mock any dependencies
        $this->entityManager = $this->createMock(EntityManager::class);

        parent::setUp();
    }

    protected function getExtensions(): array
    {
        // create a type instance with the mocked dependencies
        $type = new TestedType($this->entityManager);

        return [
            // register the type instances with the PreloadedExtension
            new PreloadedExtension([$type], []),
        ];
    }

    public function testSubmitValidData(): void
    {
        // ...

        // Instead of creating a new instance, the one created in
        // getExtensions() will be used.
        $form = $this->factory->create(TestedType::class, $formData);

        // ... your test
    }
}

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// tests/Form/Type/TestedTypeTest.php
namespace App\Tests\Form\Type;

// ...
use Symfony\Component\Form\Extension\Validator\ValidatorExtension;
use Symfony\Component\Validator\Validation;

class TestedTypeTest extends TypeTestCase
{
    protected function getExtensions(): array
    {
        $validator = Validation::createValidator();

        // or if you also need to read constraints from attributes
        $validator = Validation::createValidatorBuilder()
            ->enableAttributeMapping()
            ->getValidator();

        return [
            new ValidatorExtension($validator),
        ];
    }

    // ... your tests
}