class ValidationTest

class ValidationTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    public static $modules = [
        'form_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests #element_validate and #validate.
     */
    public function testValidate() {
        $this->drupalGet('form-test/validate');
        // Verify that #element_validate handlers can alter the form and submitted
        // form values.
        $edit = [
            'name' => 'element_validate',
        ];
        $this->drupalPostForm(NULL, $edit, 'Save');
        $this->assertFieldByName('name', '#value changed by #element_validate', 'Form element #value was altered.');
        $this->assertText('Name value: value changed by setValueForElement() in #element_validate', 'Form element value in $form_state was altered.');
        // Verify that #validate handlers can alter the form and submitted
        // form values.
        $edit = [
            'name' => 'validate',
        ];
        $this->drupalPostForm(NULL, $edit, 'Save');
        $this->assertFieldByName('name', '#value changed by #validate', 'Form element #value was altered.');
        $this->assertText('Name value: value changed by setValueForElement() in #validate', 'Form element value in $form_state was altered.');
        // Verify that #element_validate handlers can make form elements
        // inaccessible, but values persist.
        $edit = [
            'name' => 'element_validate_access',
        ];
        $this->drupalPostForm(NULL, $edit, 'Save');
        $this->assertNoFieldByName('name', 'Form element was hidden.');
        $this->assertText('Name value: element_validate_access', 'Value for inaccessible form element exists.');
        // Verify that value for inaccessible form element persists.
        $this->drupalPostForm(NULL, [], 'Save');
        $this->assertNoFieldByName('name', 'Form element was hidden.');
        $this->assertText('Name value: element_validate_access', 'Value for inaccessible form element exists.');
        // 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->drupalPostForm() 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->drupalPostForm(NULL, [
            'name' => 'validate',
        ], 'Save');
        $this->assertNoFieldByName('name', '#value changed by #validate', 'Form element #value was not altered.');
        $this->assertNoText('Name value: value changed by setValueForElement() in #validate', 'Form element value in $form_state was not altered.');
        $this->assertText('The form has become outdated.');
    }
    
    /**
     * Tests that a form with a disabled CSRF token can be validated.
     */
    public function testDisabledToken() {
        $this->drupalPostForm('form-test/validate-no-token', [], 'Save');
        $this->assertText('The form_test_validate_no_token form has been submitted successfully.');
    }
    
    /**
     * Tests partial form validation through #limit_validation_errors.
     */
    public function testValidateLimitErrors() {
        $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) {
            $element = $this->xpath('//input[@id=:id and @formnovalidate=:expected]', [
                ':id' => 'edit-' . $type,
                ':expected' => $expected,
            ]);
            $this->assertTrue(!empty($element), new FormattableMarkup('The @type button has the proper formnovalidate attribute.', [
                '@type' => $type,
            ]));
        }
        // The button with full server-side validation should not have the
        // 'formnovalidate' attribute.
        $element = $this->xpath('//input[@id=:id and not(@formnovalidate)]', [
            ':id' => 'edit-full',
        ]);
        $this->assertTrue(!empty($element), 'The button with full server-side validation does not have the formnovalidate attribute.');
        // 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.
        $this->drupalPostForm($path, $edit, t('Partial validate'));
        $this->assertNoText(t('@name field is required.', [
            '@name' => 'Title',
        ]));
        $this->assertText('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.
        $this->drupalPostForm($path, $edit, t('Partial validate (numeric index)'));
        $this->assertNoText(t('@name field is required.', [
            '@name' => 'Title',
        ]));
        $this->assertText('Test (numeric index) element is invalid');
        // Ensure something like 'foobar' isn't considered "inside" 'foo'.
        $this->drupalPostForm($path, $edit, t('Partial validate (substring)'));
        $this->assertNoText(t('@name field is required.', [
            '@name' => 'Title',
        ]));
        $this->assertText('Test (substring) foo element is invalid');
        // Ensure not validated values are not available to submit handlers.
        $this->drupalPostForm($path, [
            'title' => '',
            'test' => 'valid',
        ], t('Partial validate'));
        $this->assertText('Only validated values appear in the form values.');
        // Now test full form validation and ensure that the #element_validate
        // handler is still triggered.
        $this->drupalPostForm($path, $edit, t('Full validate'));
        $this->assertText(t('@name field is required.', [
            '@name' => 'Title',
        ]));
        $this->assertText('Test element is invalid');
    }
    
    /**
     * Tests #pattern validation.
     */
    public function testPatternValidation() {
        $textfield_error = t('%name field is not in the right format.', [
            '%name' => 'One digit followed by lowercase letters',
        ]);
        $tel_error = t('%name field is not in the right format.', [
            '%name' => 'Everything except numbers',
        ]);
        $password_error = t('%name field is not in the right format.', [
            '%name' => 'Password',
        ]);
        // Invalid textfield, valid tel.
        $edit = [
            'textfield' => 'invalid',
            'tel' => 'valid',
        ];
        $this->drupalPostForm('form-test/pattern', $edit, 'Submit');
        $this->assertRaw($textfield_error);
        $this->assertNoRaw($tel_error);
        $this->assertNoRaw($password_error);
        // Valid textfield, invalid tel, valid password.
        $edit = [
            'textfield' => '7seven',
            'tel' => '818937',
            'password' => '0100110',
        ];
        $this->drupalPostForm('form-test/pattern', $edit, 'Submit');
        $this->assertNoRaw($textfield_error);
        $this->assertRaw($tel_error);
        $this->assertNoRaw($password_error);
        // Non required fields are not validated if empty.
        $edit = [
            'textfield' => '',
            'tel' => '',
        ];
        $this->drupalPostForm('form-test/pattern', $edit, 'Submit');
        $this->assertNoRaw($textfield_error);
        $this->assertNoRaw($tel_error);
        $this->assertNoRaw($password_error);
        // Invalid password.
        $edit = [
            'password' => $this->randomMachineName(),
        ];
        $this->drupalPostForm('form-test/pattern', $edit, 'Submit');
        $this->assertNoRaw($textfield_error);
        $this->assertNoRaw($tel_error);
        $this->assertRaw($password_error);
        // The pattern attribute overrides #pattern and is not validated on the
        // server side.
        $edit = [
            'textfield' => '',
            'tel' => '',
            'url' => 'http://www.example.com/',
        ];
        $this->drupalPostForm('form-test/pattern', $edit, 'Submit');
        $this->assertNoRaw(t('%name field is not in the right format.', [
            '%name' => 'Client side validation',
        ]));
    }
    
    /**
     * Tests #required with custom validation errors.
     *
     * @see \Drupal\form_test\Form\FormTestValidateRequiredForm
     */
    public function testCustomRequiredError() {
        $form = \Drupal::formBuilder()->getForm('\\Drupal\\form_test\\Form\\FormTestValidateRequiredForm');
        // Verify that a custom #required error can be set.
        $edit = [];
        $this->drupalPostForm('form-test/validate-required', $edit, 'Submit');
        foreach (Element::children($form) as $key) {
            if (isset($form[$key]['#required_error'])) {
                $this->assertNoText(t('@name field is required.', [
                    '@name' => $form[$key]['#title'],
                ]));
                $this->assertText($form[$key]['#required_error']);
            }
            elseif (isset($form[$key]['#form_test_required_error'])) {
                $this->assertNoText(t('@name field is required.', [
                    '@name' => $form[$key]['#title'],
                ]));
                $this->assertText($form[$key]['#form_test_required_error']);
            }
        }
        $this->assertNoText(t('An illegal choice has been detected. Please contact the site administrator.'));
        // Verify that no custom validation error appears with valid values.
        $edit = [
            'textfield' => $this->randomString(),
            'checkboxes[foo]' => TRUE,
            'select' => 'foo',
        ];
        $this->drupalPostForm('form-test/validate-required', $edit, 'Submit');
        foreach (Element::children($form) as $key) {
            if (isset($form[$key]['#required_error'])) {
                $this->assertNoText(t('@name field is required.', [
                    '@name' => $form[$key]['#title'],
                ]));
                $this->assertNoText($form[$key]['#required_error']);
            }
            elseif (isset($form[$key]['#form_test_required_error'])) {
                $this->assertNoText(t('@name field is required.', [
                    '@name' => $form[$key]['#title'],
                ]));
                $this->assertNoText($form[$key]['#form_test_required_error']);
            }
        }
        $this->assertNoText(t('An illegal choice has been detected. Please contact the site administrator.'));
    }

}