ValidationTest.php

<?php

declare (strict_types=1);
namespace Drupal\Tests\system\Functional\Form;

use Drupal\Core\Render\Element;
use Drupal\Tests\BrowserTestBase;

/**
 * Tests form processing and alteration via form validation handlers.
 *
 * @group Form
 * @group #slow
 */
class ValidationTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'form_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests #element_validate and #validate.
     */
    public function testValidate() : void {
        $this->drupalGet('form-test/validate');
        // Verify that #element_validate handlers can alter the form and submitted
        // form values.
        $edit = [
            'name' => 'element_validate',
        ];
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->fieldValueEquals('name', '#value changed by #element_validate');
        $this->assertSession()
            ->pageTextContains('Name value: value changed by setValueForElement() in #element_validate');
        // Verify that #validate handlers can alter the form and submitted
        // form values.
        $edit = [
            'name' => 'validate',
        ];
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->fieldValueEquals('name', '#value changed by #validate');
        $this->assertSession()
            ->pageTextContains('Name value: value changed by setValueForElement() in #validate');
        // Verify that #element_validate handlers can make form elements
        // inaccessible, but values persist.
        $edit = [
            'name' => 'element_validate_access',
        ];
        $this->submitForm($edit, 'Save');
        $this->assertSession()
            ->fieldNotExists('name');
        $this->assertSession()
            ->pageTextContains('Name value: element_validate_access');
        // Verify that value for inaccessible form element persists.
        $this->submitForm([], 'Save');
        $this->assertSession()
            ->fieldValueNotEquals('name', 'Form element was hidden.');
        $this->assertSession()
            ->pageTextContains('Name value: element_validate_access');
        // Verify that #validate handlers don't run if the CSRF token is invalid.
        $this->drupalLogin($this->drupalCreateUser());
        $this->drupalGet('form-test/validate');
        // $this->assertSession()->fieldExists() does not recognize hidden fields,
        // which breaks $this->submitForm() if we try to change the value of a
        // hidden field such as form_token.
        $this->assertSession()
            ->elementExists('css', 'input[name="form_token"]')
            ->setValue('invalid_token');
        $this->submitForm([
            'name' => 'validate',
        ], 'Save');
        $this->assertSession()
            ->fieldValueNotEquals('name', '#value changed by #validate');
        $this->assertSession()
            ->pageTextNotContains('Name value: value changed by setValueForElement() in #validate');
        $this->assertSession()
            ->pageTextContains('The form has become outdated.');
    }
    
    /**
     * Tests that a form with a disabled CSRF token can be validated.
     */
    public function testDisabledToken() : void {
        $this->drupalGet('form-test/validate-no-token');
        $this->submitForm([], 'Save');
        $this->assertSession()
            ->pageTextContains('The form_test_validate_no_token form has been submitted successfully.');
    }
    
    /**
     * Tests partial form validation through #limit_validation_errors.
     */
    public function testValidateLimitErrors() : void {
        $edit = [
            'test' => 'invalid',
            'test_numeric_index[0]' => 'invalid',
            'test_substring[foo]' => 'invalid',
        ];
        $path = 'form-test/limit-validation-errors';
        // Render the form, and verify that the buttons with limited server-side
        // validation have the proper 'formnovalidate' attribute (to prevent
        // client-side validation by the browser).
        $this->drupalGet($path);
        $expected = 'formnovalidate';
        foreach ([
            'partial',
            'partial-numeric-index',
            'substring',
        ] as $type) {
            // Verify the $type button has the proper formnovalidate attribute.
            $this->assertSession()
                ->elementExists('xpath', "//input[@id='edit-{$type}' and @formnovalidate='{$expected}']");
        }
        // The button with full server-side validation should not have the
        // 'formnovalidate' attribute.
        $this->assertSession()
            ->elementExists('xpath', "//input[@id='edit-full' and not(@formnovalidate)]");
        // Submit the form by pressing the 'Partial validate' button (uses
        // #limit_validation_errors) and ensure that the title field is not
        // validated, but the #element_validate handler for the 'test' field
        // is triggered.
        $this->drupalGet($path);
        $this->submitForm($edit, 'Partial validate');
        $this->assertSession()
            ->pageTextNotContains('Title field is required.');
        $this->assertSession()
            ->pageTextContains('Test element is invalid');
        // Edge case of #limit_validation_errors containing numeric indexes: same
        // thing with the 'Partial validate (numeric index)' button and the
        // 'test_numeric_index' field.
        $this->drupalGet($path);
        $this->submitForm($edit, 'Partial validate (numeric index)');
        $this->assertSession()
            ->pageTextNotContains('Title field is required.');
        $this->assertSession()
            ->pageTextContains('Test (numeric index) element is invalid');
        // Ensure something like 'foobar' isn't considered "inside" 'foo'.
        $this->drupalGet($path);
        $this->submitForm($edit, 'Partial validate (substring)');
        $this->assertSession()
            ->pageTextNotContains('Title field is required.');
        $this->assertSession()
            ->pageTextContains('Test (substring) foo element is invalid');
        // Ensure not validated values are not available to submit handlers.
        $this->drupalGet($path);
        $this->submitForm([
            'title' => '',
            'test' => 'valid',
        ], 'Partial validate');
        $this->assertSession()
            ->pageTextContains('Only validated values appear in the form values.');
        // Now test full form validation and ensure that the #element_validate
        // handler is still triggered.
        $this->drupalGet($path);
        $this->submitForm($edit, 'Full validate');
        $this->assertSession()
            ->pageTextContains('Title field is required.');
        $this->assertSession()
            ->pageTextContains('Test element is invalid');
    }
    
    /**
     * Tests #pattern validation.
     */
    public function testPatternValidation() : void {
        $textfield_error = 'One digit followed by lowercase letters field is not in the right format.';
        $tel_error = 'Everything except numbers field is not in the right format.';
        $password_error = 'Password field is not in the right format.';
        // Invalid textfield, valid tel.
        $edit = [
            'textfield' => 'invalid',
            'tel' => 'valid',
        ];
        $this->drupalGet('form-test/pattern');
        $this->submitForm($edit, 'Submit');
        $this->assertSession()
            ->pageTextContains($textfield_error);
        $this->assertSession()
            ->pageTextNotContains($tel_error);
        $this->assertSession()
            ->pageTextNotContains($password_error);
        // Valid textfield, invalid tel, valid password.
        $edit = [
            'textfield' => '7seven',
            'tel' => '818937',
            'password' => '0100110',
        ];
        $this->drupalGet('form-test/pattern');
        $this->submitForm($edit, 'Submit');
        $this->assertSession()
            ->pageTextNotContains($textfield_error);
        $this->assertSession()
            ->pageTextContains($tel_error);
        $this->assertSession()
            ->pageTextNotContains($password_error);
        // Non required fields are not validated if empty.
        $edit = [
            'textfield' => '',
            'tel' => '',
        ];
        $this->drupalGet('form-test/pattern');
        $this->submitForm($edit, 'Submit');
        $this->assertSession()
            ->pageTextNotContains($textfield_error);
        $this->assertSession()
            ->pageTextNotContains($tel_error);
        $this->assertSession()
            ->pageTextNotContains($password_error);
        // Invalid password.
        $edit = [
            'password' => $this->randomMachineName(),
        ];
        $this->drupalGet('form-test/pattern');
        $this->submitForm($edit, 'Submit');
        $this->assertSession()
            ->pageTextNotContains($textfield_error);
        $this->assertSession()
            ->pageTextNotContains($tel_error);
        $this->assertSession()
            ->pageTextContains($password_error);
        // The pattern attribute overrides #pattern and is not validated on the
        // server side.
        $edit = [
            'textfield' => '',
            'tel' => '',
            'url' => 'http://www.example.com/',
        ];
        $this->drupalGet('form-test/pattern');
        $this->submitForm($edit, 'Submit');
        $this->assertSession()
            ->pageTextNotContains('Client side validation field is not in the right format.');
    }
    
    /**
     * Tests #required with custom validation errors.
     *
     * @see \Drupal\form_test\Form\FormTestValidateRequiredForm
     */
    public function testCustomRequiredError() : void {
        $form = \Drupal::formBuilder()->getForm('\\Drupal\\form_test\\Form\\FormTestValidateRequiredForm');
        // Verify that a custom #required error can be set.
        $edit = [];
        $this->drupalGet('form-test/validate-required');
        $this->submitForm($edit, 'Submit');
        foreach (Element::children($form) as $key) {
            if (isset($form[$key]['#required_error'])) {
                $this->assertSession()
                    ->pageTextNotContains($form[$key]['#title'] . ' field is required.');
                $this->assertSession()
                    ->pageTextContains((string) $form[$key]['#required_error']);
            }
            elseif (isset($form[$key]['#form_test_required_error'])) {
                $this->assertSession()
                    ->pageTextNotContains($form[$key]['#title'] . ' field is required.');
                $this->assertSession()
                    ->pageTextContains((string) $form[$key]['#form_test_required_error']);
            }
            if (isset($form[$key]['#title'])) {
                $this->assertSession()
                    ->pageTextNotContains('The submitted value in the ' . $form[$key]['#title'] . ' element is not allowed.');
            }
        }
        // Verify that no custom validation error appears with valid values.
        $edit = [
            'textfield' => $this->randomString(),
            'checkboxes[foo]' => TRUE,
            'select' => 'foo',
        ];
        $this->drupalGet('form-test/validate-required');
        $this->submitForm($edit, 'Submit');
        foreach (Element::children($form) as $key) {
            if (isset($form[$key]['#required_error'])) {
                $this->assertSession()
                    ->pageTextNotContains($form[$key]['#title'] . ' field is required.');
                $this->assertSession()
                    ->pageTextNotContains((string) $form[$key]['#required_error']);
            }
            elseif (isset($form[$key]['#form_test_required_error'])) {
                $this->assertSession()
                    ->pageTextNotContains($form[$key]['#title'] . ' field is required.');
                $this->assertSession()
                    ->pageTextNotContains((string) $form[$key]['#form_test_required_error']);
            }
            if (isset($form[$key]['#title'])) {
                $this->assertSession()
                    ->pageTextNotContains('The submitted value in the ' . $form[$key]['#title'] . ' element is not allowed.');
            }
        }
    }

}