class FieldWidgetConstraintValidatorTest

class FieldWidgetConstraintValidatorTest extends KernelTestBase {
    protected static $modules = [
        'entity_test',
        'field',
        'field_test',
        'user',
        'system',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() : void {
        parent::setUp();
        $this->installEntitySchema('user');
        $this->installEntitySchema('entity_test_composite_constraint');
    }
    
    /**
     * Tests widget constraint validation.
     */
    public function testValidation() {
        $entity_type = 'entity_test_constraint_violation';
        $entity = $this->container
            ->get('entity_type.manager')
            ->getStorage($entity_type)
            ->create([
            'id' => 1,
            'revision_id' => 1,
        ]);
        $display = \Drupal::service('entity_display.repository')->getFormDisplay($entity_type, $entity_type);
        $form = [];
        $form_state = new FormState();
        $display->buildForm($entity, $form, $form_state);
        // Pretend the form has been built.
        $form_state->setFormObject(\Drupal::entityTypeManager()->getFormObject($entity_type, 'default'));
        \Drupal::formBuilder()->prepareForm('field_test_entity_form', $form, $form_state);
        \Drupal::formBuilder()->processForm('field_test_entity_form', $form, $form_state);
        // Validate the field constraint.
        $form_state->getFormObject()
            ->setEntity($entity)
            ->setFormDisplay($display, $form_state);
        $entity = $form_state->getFormObject()
            ->buildEntity($form, $form_state);
        $display->validateFormValues($entity, $form, $form_state);
        $errors = $form_state->getErrors();
        $this->assertEquals('Widget constraint has failed.', $errors['name'], 'Constraint violation at the field items list level is generated correctly');
        $this->assertEquals('Widget constraint has failed.', $errors['test_field'], 'Constraint violation at the field items list level is generated correctly for an advanced widget');
    }
    
    /**
     * Gets the form errors for a given entity.
     *
     * @param \Drupal\Core\Entity\EntityInterface $entity
     *   The entity
     * @param array $hidden_fields
     *   (optional) A list of hidden fields.
     *
     * @return array
     *   The form errors.
     */
    protected function getErrorsForEntity(EntityInterface $entity, $hidden_fields = []) {
        $entity_type_id = 'entity_test_composite_constraint';
        $display = \Drupal::service('entity_display.repository')->getFormDisplay($entity_type_id, $entity_type_id);
        foreach ($hidden_fields as $hidden_field) {
            $display->removeComponent($hidden_field);
        }
        $form = [];
        $form_state = new FormState();
        $display->buildForm($entity, $form, $form_state);
        $form_state->setFormObject(\Drupal::entityTypeManager()->getFormObject($entity_type_id, 'default'));
        \Drupal::formBuilder()->prepareForm('field_test_entity_form', $form, $form_state);
        \Drupal::formBuilder()->processForm('field_test_entity_form', $form, $form_state);
        // Validate the field constraint.
        
        /** @var \Drupal\Core\Entity\ContentEntityFormInterface $form_object */
        $form_object = $form_state->getFormObject();
        $form_object->setEntity($entity)
            ->setFormDisplay($display, $form_state)
            ->validateForm($form, $form_state);
        return $form_state->getErrors();
    }
    
    /**
     * Tests widget constraint validation with composite constraints.
     */
    public function testValidationWithCompositeConstraint() {
        // First provide a valid value, this should cause no validation.
        $entity = EntityTestCompositeConstraint::create([
            'name' => 'valid-value',
        ]);
        $entity->save();
        $errors = $this->getErrorsForEntity($entity);
        $this->assertFalse(isset($errors['name']));
        $this->assertFalse(isset($errors['type']));
        // Provide an invalid value for the name field.
        $entity = EntityTestCompositeConstraint::create([
            'name' => 'failure-field-name',
        ]);
        $errors = $this->getErrorsForEntity($entity);
        $this->assertTrue(isset($errors['name']));
        $this->assertFalse(isset($errors['type']));
        // Hide the second field (type) and ensure the validation still happens. The
        // error message appears on the first field (name).
        $entity = EntityTestCompositeConstraint::create([
            'name' => 'failure-field-name',
        ]);
        $errors = $this->getErrorsForEntity($entity, [
            'type',
        ]);
        $this->assertTrue(isset($errors['name']));
        $this->assertFalse(isset($errors['type']));
        // Provide a violation again, but this time hide the first field (name).
        // Ensure that the validation still happens and the error message is moved
        // from the field to the second field and have a custom error message.
        $entity = EntityTestCompositeConstraint::create([
            'name' => 'failure-field-name',
        ]);
        $errors = $this->getErrorsForEntity($entity, [
            'name',
        ]);
        $this->assertFalse(isset($errors['name']));
        $this->assertTrue(isset($errors['type']));
        $this->assertEquals(new FormattableMarkup('The validation failed because the value conflicts with the value in %field_name, which you cannot access.', [
            '%field_name' => 'name',
        ]), $errors['type']);
    }
    
    /**
     * Tests entity level constraint validation.
     */
    public function testEntityLevelConstraintValidation() {
        $entity = EntityTestCompositeConstraint::create([
            'name' => 'entity-level-violation',
        ]);
        $entity->save();
        $errors = $this->getErrorsForEntity($entity);
        $this->assertEquals('Entity level validation', $errors['']);
        $entity->name->value = 'entity-level-violation-with-path';
        $errors = $this->getErrorsForEntity($entity);
        $this->assertEquals('Entity level validation', $errors['test][form][element']);
    }

}