class StateValuesCleanTest

class StateValuesCleanTest extends BrowserTestBase {
    
    /**
     * Modules to enable.
     *
     * @var array
     */
    protected static $modules = [
        'form_test',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Tests \Drupal\Core\Form\FormState::cleanValues().
     */
    public function testFormStateValuesClean() {
        $this->drupalGet('form_test/form-state-values-clean');
        $this->submitForm([], 'Submit');
        $values = Json::decode($this->getSession()
            ->getPage()
            ->getContent());
        // Setup the expected result.
        $result = [
            'beer' => 1000,
            'baz' => [
                'beer' => 2000,
            ],
        ];
        // Verify that all internal Form API elements were removed.
        $this->assertFalse(isset($values['form_id']), new FormattableMarkup('%element was removed.', [
            '%element' => 'form_id',
        ]));
        $this->assertFalse(isset($values['form_token']), new FormattableMarkup('%element was removed.', [
            '%element' => 'form_token',
        ]));
        $this->assertFalse(isset($values['form_build_id']), new FormattableMarkup('%element was removed.', [
            '%element' => 'form_build_id',
        ]));
        $this->assertFalse(isset($values['op']), new FormattableMarkup('%element was removed.', [
            '%element' => 'op',
        ]));
        // Verify that all buttons were removed.
        $this->assertFalse(isset($values['foo']), new FormattableMarkup('%element was removed.', [
            '%element' => 'foo',
        ]));
        $this->assertFalse(isset($values['bar']), new FormattableMarkup('%element was removed.', [
            '%element' => 'bar',
        ]));
        $this->assertFalse(isset($values['baz']['foo']), new FormattableMarkup('%element was removed.', [
            '%element' => 'foo',
        ]));
        $this->assertFalse(isset($values['baz']['baz']), new FormattableMarkup('%element was removed.', [
            '%element' => 'baz',
        ]));
        // Verify values manually added for cleaning were removed.
        $this->assertFalse(isset($values['wine']), new FormattableMarkup('%element was removed.', [
            '%element' => 'wine',
        ]));
        // Verify that nested form value still exists.
        $this->assertTrue(isset($values['baz']['beer']), 'Nested form value still exists.');
        // Verify that actual form values equal resulting form values.
        $this->assertEquals($result, $values, 'Expected form values equal actual form values.');
    }

}