class SimpletestTestForm

simpletest.routing.yml in drupal/core/modules/simpletest/simpletest.routing.yml

drupal/core/modules/simpletest/simpletest.routing.yml

class SimpletestTestForm implements FormInterface {

  /**
   * {@inheritdoc}
   */
  public function getFormID() {
    return 'simpletest_test_form';
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, array &$form_state) {
    $form['tests'] = array(
      '#type' => 'details',
      '#title' => t('Tests'),
      '#description' => t('Select the test(s) or test group(s) you would like to run, and click <em>Run tests</em>.'),
    );
    $form['tests']['table'] = array(
      '#theme' => 'simpletest_test_table',
    );

    // Generate the list of tests arranged by group.
    $groups = simpletest_test_get_all();
    $groups['PHPUnit'] = simpletest_phpunit_get_available_tests();
    $form_state['storage']['PHPUnit'] = $groups['PHPUnit'];
    foreach ($groups as $group => $tests) {
      $form['tests']['table'][$group] = array(
        '#collapsed' => TRUE,
      );
      foreach ($tests as $class => $info) {
        $form['tests']['table'][$group][$class] = array(
          '#type' => 'checkbox',
          '#title' => $info['name'],
          '#description' => $info['description'],
        );
      }
    }

    // Action buttons.
    $form['tests']['op'] = array(
      '#type' => 'submit',
      '#value' => t('Run tests'),
    );
    $form['clean'] = array(
      '#type' => 'fieldset',
      '#title' => t('Clean test environment'),
      '#description' => t('Remove tables with the prefix "simpletest" and temporary directories that are left over from tests that crashed. This is intended for developers when creating tests.'),
    );
    $form['clean']['op'] = array(
      '#type' => 'submit',
      '#value' => t('Clean environment'),
      '#submit' => array(
        'simpletest_clean_environment',
      ),
    );
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function validateForm(array &$form, array &$form_state) {
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, array &$form_state) {

    // Get list of tests.
    $tests_list = array();
    simpletest_classloader_register();
    $phpunit_all = array_keys($form_state['storage']['PHPUnit']);
    foreach ($form_state['values'] as $class_name => $value) {

      // Since class_exists() will likely trigger an autoload lookup,
      // we do the fast check first.
      if ($value === 1 && class_exists($class_name)) {
        $test_type = in_array($class_name, $phpunit_all) ? 'UnitTest' : 'WebTest';
        $tests_list[$test_type][] = $class_name;
      }
    }
    if (count($tests_list) > 0) {
      $test_id = simpletest_run_tests($tests_list, 'drupal');
      $form_state['redirect'] = 'admin/config/development/testing/results/' . $test_id;
    }
    else {
      drupal_set_message(t('No test(s) selected.'), 'error');
    }
  }

}