Club Drupal

<?php

class AJAXTestCase extends DrupalWebTestCase {

  function setUp() {

    $modules = func_get_args();

    if (isset($modules[0]) && is_array($modules[0])) {

      $modules = $modules[0];

    }

    parent::setUp(array_unique(array_merge(array('ajax_test', 'ajax_forms_test'), $modules)));

  }

  /**

   * Assert that a command with the required properties exists within the array of Ajax commands returned by the server.

   *

   * The Ajax framework, via the ajax_deliver() and ajax_render() functions,

   * returns an array of commands. This array sometimes includes commands

   * automatically provided by the framework in addition to commands returned by

   * a particular page callback. During testing, we're usually interested that a

   * particular command is present, and don't care whether other commands

   * precede or follow the one we're interested in. Additionally, the command

   * we're interested in may include additional data that we're not interested

   * in. Therefore, this function simply asserts that one of the commands in

   * $haystack contains all of the keys and values in $needle. Furthermore, if

   * $needle contains a 'settings' key with an array value, we simply assert

   * that all keys and values within that array are present in the command we're

   * checking, and do not consider it a failure if the actual command contains

   * additional settings that aren't part of $needle.

   *

   * @param $haystack

   *   An array of Ajax commands returned by the server.

   * @param $needle

   *   Array of info we're expecting in one of those commands.

   * @param $message

   *   An assertion message.

   */

  protected function assertCommand($haystack, $needle, $message) {

    $found = FALSE;

    foreach ($haystack as $command) {

      // If the command has additional settings that we're not testing for, do

      // not consider that a failure.

      if (isset($command['settings']) && is_array($command['settings']) && isset($needle['settings']) && is_array($needle['settings'])) {

        $command['settings'] = array_intersect_key($command['settings'], $needle['settings']);

      }

      // If the command has additional data that we're not testing for, do not

      // consider that a failure. Also, == instead of ===, because we don't

      // require the key/value pairs to be in any particular order

      // (http://www.php.net/manual/en/language.operators.array.php).

      if (array_intersect_key($command, $needle) == $needle) {

        $found = TRUE;

        break;

      }

    }

    $this->assertTrue($found, $message);

  }

}

/**

 * Tests primary Ajax framework functions.

 */

class AJAXFrameworkTestCase extends AJAXTestCase {

  protected $profile = 'testing';

  public static function getInfo() {

    return array(

      'name' => 'AJAX framework',

      'description' => 'Performs tests on AJAX framework functions.',

      'group' => 'AJAX',

    );

  }

  /**

   * Test that ajax_render() returns JavaScript settings generated during the page request.

   *

   * @todo Add tests to ensure that ajax_render() returns commands for new CSS

   *   and JavaScript files to be loaded by the page. See

   *   http://drupal.org/node/561858.

   */

  function testAJAXRender() {

    $commands = $this->drupalGetAJAX('ajax-test/render');

    // Verify that there is a command to load settings added with

    // drupal_add_js().

    $expected = array(

      'command' => 'settings',

      'settings' => array('basePath' => base_path(), 'ajax' => 'test'),

    );

    $this->assertCommand($commands, $expected, t('ajax_render() loads settings added with drupal_add_js().'));

    // Verify that Ajax settings are loaded for #type 'link'.

    $this->drupalGet('ajax-test/link');

    $settings = $this->drupalGetSettings();

    $this->assertEqual($settings['ajax']['ajax-link']['url'], url('filter/tips'));

    $this->assertEqual($settings['ajax']['ajax-link']['wrapper'], 'block-system-main');

  }

  /**

   * Test behavior of ajax_render_error().

   */

  function testAJAXRenderError() {

    // Verify default error message.

    $commands = $this->drupalGetAJAX('ajax-test/render-error');

    $expected = array(

      'command' => 'alert',

      'text' => t('An error occurred while handling the request: The server received invalid input.'),

    );

    $this->assertCommand($commands, $expected, t('ajax_render_error() invokes alert command.'));

    // Verify custom error message.

    $edit = array(

      'message' => 'Custom error message.',

    );

    $commands = $this->drupalGetAJAX('ajax-test/render-error', array('query' => $edit));

    $expected = array(

      'command' => 'alert',

      'text' => $edit['message'],

    );

     $this->assertCommand($commands, $expected, t('Custom error message is output.'));

  }

  /**

   * Test that new JavaScript and CSS files added during an AJAX request are returned.

   */

  function testLazyLoad() {

    $expected = array(

      'setting_name' => 'ajax_forms_test_lazy_load_form_submit',

      'setting_value' => 'executed',

      'css' => drupal_get_path('module', 'system') . '/system.admin.css',

      'js' => drupal_get_path('module', 'system') . '/system.js',

    );

    // @todo D8: Add a drupal_css_defaults() helper function.

    $expected_css_html = drupal_get_css(array($expected['css'] => array(

      'type' => 'file',

      'group' => CSS_DEFAULT,

      'weight' => 0,

      'every_page' => FALSE,

      'media' => 'all',

      'preprocess' => TRUE,

      'data' => $expected['css'],

      'browsers' => array('IE' => TRUE, '!IE' => TRUE),

    )), TRUE);

    $expected_js_html = drupal_get_js('header', array($expected['js'] => drupal_js_defaults($expected['js'])), TRUE);

    // Get the base page.

    $this->drupalGet('ajax_forms_test_lazy_load_form');

    $original_settings = $this->drupalGetSettings();

    $original_css = $original_settings['ajaxPageState']['css'];

    $original_js = $original_settings['ajaxPageState']['js'];

    // Verify that the base page doesn't have the settings and files that are to

    // be lazy loaded as part of the next requests.

    $this->assertTrue(!isset($original_settings[$expected['setting_name']]), t('Page originally lacks the %setting, as expected.', array('%setting' => $expected['setting_name'])));

    $this->assertTrue(!isset($original_settings[$expected['css']]), t('Page originally lacks the %css file, as expected.', array('%css' => $expected['css'])));

    $this->assertTrue(!isset($original_settings[$expected['js']]), t('Page originally lacks the %js file, as expected.', array('%js' => $expected['js'])));

    // Submit the AJAX request without triggering files getting added.

    $commands = $this->drupalPostAJAX(NULL, array('add_files' => FALSE), array('op' => t('Submit')));

    $new_settings = $this->drupalGetSettings();

    // Verify the setting was not added when not expected.

    $this->assertTrue(!isset($new_settings['setting_name']), t('Page still lacks the %setting, as expected.', array('%setting' => $expected['setting_name'])));

    // Verify a settings command does not add CSS or scripts to Drupal.settings

    // and no command inserts the corresponding tags on the page.

    $found_settings_command = FALSE;

    $found_markup_command = FALSE;

    foreach ($commands as $command) {

      if ($command['command'] == 'settings' && (array_key_exists('css', $command['settings']['ajaxPageState']) || array_key_exists('js', $command['settings']['ajaxPageState']))) {

        $found_settings_command = TRUE;

      }

      if (isset($command['data']) && ($command['data'] == $expected_js_html || $command['data'] == $expected_css_html)) {

        $found_markup_command = TRUE;

      }

    }

    $this->assertFalse($found_settings_command, t('Page state still lacks the %css and %js files, as expected.', array('%css' => $expected['css'], '%js' => $expected['js'])));

    $this->assertFalse($found_markup_command, t('Page still lacks the %css and %js files, as expected.', array('%css' => $expected['css'], '%js' => $expected['js'])));

    // Submit the AJAX request and trigger adding files.

    $commands = $this->drupalPostAJAX(NULL, array('add_files' => TRUE), array('op' => t('Submit')));

    $new_settings = $this->drupalGetSettings();

    $new_css = $new_settings['ajaxPageState']['css'];

    $new_js = $new_settings['ajaxPageState']['js'];

    // Verify the expected setting was added.

    $this->assertIdentical($new_settings[$expected['setting_name']], $expected['setting_value'], t('Page now has the %setting.', array('%setting' => $expected['setting_name'])));

    // Verify the expected CSS file was added, both to Drupal.settings, and as

    // an AJAX command for inclusion into the HTML.

    $this->assertEqual($new_css, $original_css + array($expected['css'] => 1), t('Page state now has the %css file.', array('%css' => $expected['css'])));

    $this->assertCommand($commands, array('data' => $expected_css_html), t('Page now has the %css file.', array('%css' => $expected['css'])));

    // Verify the expected JS file was added, both to Drupal.settings, and as

    // an AJAX command for inclusion into the HTML. By testing for an exact HTML

    // string containing the SCRIPT tag, we also ensure that unexpected

    // JavaScript code, such as a jQuery.extend() that would potentially clobber

    // rather than properly merge settings, didn't accidentally get added.

    $this->assertEqual($new_js, $original_js + array($expected['js'] => 1), t('Page state now has the %js file.', array('%js' => $expected['js'])));

    $this->assertCommand($commands, array('data' => $expected_js_html), t('Page now has the %js file.', array('%js' => $expected['js'])));

  }

  /**

   * Tests that overridden CSS files are not added during lazy load.

   */

  function testLazyLoadOverriddenCSS() {

    // The test theme overrides system.base.css without an implementation,

    // thereby removing it.

    theme_enable(array('test_theme'));

    variable_set('theme_default', 'test_theme');

    // This gets the form, and emulates an Ajax submission on it, including

    // adding markup to the HEAD and BODY for any lazy loaded JS/CSS files.

    $this->drupalPostAJAX('ajax_forms_test_lazy_load_form', array('add_files' => TRUE), array('op' => t('Submit')));

    // Verify that the resulting HTML does not load the overridden CSS file.

    // We add a "?" to the assertion, because Drupal.settings may include

    // information about the file; we only really care about whether it appears

    // in a LINK or STYLE tag, for which Drupal always adds a query string for

    // cache control.

    $this->assertNoText('system.base.css?', 'Ajax lazy loading does not add overridden CSS files.');

  }

}

/**

 * Tests Ajax framework commands.

 */

class AJAXCommandsTestCase extends AJAXTestCase {

  public static function getInfo() {

    return array(

      'name' => 'AJAX commands',

      'description' => 'Performs tests on AJAX framework commands.',

      'group' => 'AJAX',

    );

  }

  /**

   * Test the various Ajax Commands.

   */

  function testAJAXCommands() {

    $form_path = 'ajax_forms_test_ajax_commands_form';

    $web_user = $this->drupalCreateUser(array('access content'));

    $this->drupalLogin($web_user);

    $edit = array();

    // Tests the 'after' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX 'After': Click to put something after the div")));

    $expected = array(

      'command' => 'insert',

      'method' => 'after',

      'data' => 'This will be placed after',

    );

    $this->assertCommand($commands, $expected, "'after' AJAX command issued with correct data");

    // Tests the 'alert' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX 'Alert': Click to alert")));

    $expected = array(

      'command' => 'alert',

      'text' => 'Alert',

    );

    $this->assertCommand($commands, $expected, "'alert' AJAX Command issued with correct text");

    // Tests the 'append' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX 'Append': Click to append something")));

    $expected = array(

      'command' => 'insert',

      'method' => 'append',

      'data' => 'Appended text',

    );

    $this->assertCommand($commands, $expected, "'append' AJAX command issued with correct data");

    // Tests the 'before' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX 'before': Click to put something before the div")));

    $expected = array(

      'command' => 'insert',

      'method' => 'before',

      'data' => 'Before text',

    );

    $this->assertCommand($commands, $expected, "'before' AJAX command issued with correct data");

    // Tests the 'changed' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX changed: Click to mark div changed.")));

    $expected = array(

      'command' => 'changed',

      'selector' => '#changed_div',

    );

    $this->assertCommand($commands, $expected, "'changed' AJAX command issued with correct selector");

    // Tests the 'changed' command using the second argument.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX changed: Click to mark div changed with asterisk.")));

    $expected = array(

      'command' => 'changed',

      'selector' => '#changed_div',

      'asterisk' => '#changed_div_mark_this',

    );

    $this->assertCommand($commands, $expected, "'changed' AJAX command (with asterisk) issued with correct selector");

    // Tests the 'css' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("Set the '#box' div to be blue.")));

    $expected = array(

      'command' => 'css',

      'selector' => '#css_div',

      'argument' => array('background-color' => 'blue'),

    );

    $this->assertCommand($commands, $expected, "'css' AJAX command issued with correct selector");

    // Tests the 'data' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX data command: Issue command.")));

    $expected = array(

      'command' => 'data',

      'name' => 'testkey',

      'value' => 'testvalue',

    );

    $this->assertCommand($commands, $expected, "'data' AJAX command issued with correct key and value");

    // Tests the 'invoke' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX invoke command: Invoke addClass() method.")));

    $expected = array(

      'command' => 'invoke',

      'method' => 'addClass',

      'arguments' => array('error'),

    );

    $this->assertCommand($commands, $expected, "'invoke' AJAX command issued with correct method and argument");

    // Tests the 'html' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX html: Replace the HTML in a selector.")));

    $expected = array(

      'command' => 'insert',

      'method' => 'html',

      'data' => 'replacement text',

    );

    $this->assertCommand($commands, $expected, "'html' AJAX command issued with correct data");

    // Tests the 'insert' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX insert: Let client insert based on #ajax['method'].")));

    $expected = array(

      'command' => 'insert',

      'data' => 'insert replacement text',

    );

    $this->assertCommand($commands, $expected, "'insert' AJAX command issued with correct data");

    // Tests the 'prepend' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX 'prepend': Click to prepend something")));

    $expected = array(

      'command' => 'insert',

      'method' => 'prepend',

      'data' => 'prepended text',

    );

    $this->assertCommand($commands, $expected, "'prepend' AJAX command issued with correct data");

    // Tests the 'remove' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX 'remove': Click to remove text")));

    $expected = array(

      'command' => 'remove',

      'selector' => '#remove_text',

    );

    $this->assertCommand($commands, $expected, "'remove' AJAX command issued with correct command and selector");

    // Tests the 'restripe' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX 'restripe' command")));

    $expected = array(

      'command' => 'restripe',

      'selector' => '#restripe_table',

    );

    $this->assertCommand($commands, $expected, "'restripe' AJAX command issued with correct selector");

    // Tests the 'settings' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX 'settings' command")));

    $expected = array(

      'command' => 'settings',

      'settings' => array('ajax_forms_test' => array('foo' => 42)),

    );

    $this->assertCommand($commands, $expected, "'settings' AJAX command issued with correct data");

    // Tests the 'add_css' command.

    $commands = $this->drupalPostAJAX($form_path, $edit, array('op' => t("AJAX 'add_css' command")));

    $expected = array(

      'command' => 'add_css',

      'data' => 'my/file.css',

    );

    $this->assertCommand($commands, $expected, "'add_css' AJAX command issued with correct data");

  }

}

/**

 * Test that $form_state['values'] is properly delivered to $ajax['callback'].

 */

class AJAXFormValuesTestCase extends AJAXTestCase {

  public static function getInfo() {

    return array(

      'name' => 'AJAX command form values',

      'description' => 'Tests that form values are properly delivered to AJAX callbacks.',

      'group' => 'AJAX',

    );

  }

  function setUp() {

    parent::setUp();

    $this->web_user = $this->drupalCreateUser(array('access content'));

    $this->drupalLogin($this->web_user);

  }

  /**

   * Create a simple form, then POST to system/ajax to change to it.

   */

  function testSimpleAJAXFormValue() {

    // Verify form values of a select element.

    foreach (array('red', 'green', 'blue') as $item) {

      $edit = array(

        'select' => $item,

      );

      $commands = $this->drupalPostAJAX('ajax_forms_test_get_form', $edit, 'select');

      $expected = array(

        'command' => 'data',

        'value' => $item,

      );

      $this->assertCommand($commands, $expected, "verification of AJAX form values from a selectbox issued with a correct value");

    }

    // Verify form values of a checkbox element.

    foreach (array(FALSE, TRUE) as $item) {

      $edit = array(

        'checkbox' => $item,

      );

      $commands = $this->drupalPostAJAX('ajax_forms_test_get_form', $edit, 'checkbox');

      $expected = array(

        'command' => 'data',

        'value' => (int) $item,

      );

      $this->assertCommand($commands, $expected, "verification of AJAX form values from a checkbox issued with a correct value");

    }

  }

}

/**

 * Tests that Ajax-enabled forms work when multiple instances of the same form are on a page.

 */

class AJAXMultiFormTestCase extends AJAXTestCase {

  public static function getInfo() {

    return array(

      'name' => 'AJAX multi form',

      'description' => 'Tests that AJAX-enabled forms work when multiple instances of the same form are on a page.',

      'group' => 'AJAX',

    );

  }

  function setUp() {

    parent::setUp(array('form_test'));

    // Create a multi-valued field for 'page' nodes to use for Ajax testing.

    $field_name = 'field_ajax_test';

    $field = array(

      'field_name' => $field_name,

      'type' => 'text',

      'cardinality' => FIELD_CARDINALITY_UNLIMITED,

    );

    field_create_field($field);

    $instance = array(

      'field_name' => $field_name,

      'entity_type' => 'node',

      'bundle' => 'page',

    );

    field_create_instance($instance);

    // Login a user who can create 'page' nodes.

    $this->web_user = $this->drupalCreateUser(array('create page content'));

    $this->drupalLogin($this->web_user);

  }

  /**

   * Test that a page with the 'page_node_form' included twice works correctly.

   */

  function testMultiForm() {

    // HTML IDs for elements within the field are potentially modified with

    // each Ajax submission, but these variables are stable and help target the

    // desired elements.

    $field_name = 'field_ajax_test';

    $field_xpaths = array(

      'page-node-form' => '//form[@id="page-node-form"]//div[contains(@class, "field-name-field-ajax-test")]',

      'page-node-form--2' => '//form[@id="page-node-form--2"]//div[contains(@class, "field-name-field-ajax-test")]',

    );

    $button_name = $field_name . '_add_more';

    $button_value = t('Add another item');

    $button_xpath_suffix = '//input[@name="' . $button_name . '"]';

    $field_items_xpath_suffix = '//input[@type="text"]';

    // Ensure the initial page contains both node forms and the correct number

    // of field items and "add more" button for the multi-valued field within

    // each form.

    $this->drupalGet('form-test/two-instances-of-same-form');

    foreach ($field_xpaths as $form_html_id => $field_xpath) {

      $this->assert(count($this->xpath($field_xpath . $field_items_xpath_suffix)) == 1, t('Found the correct number of field items on the initial page.'));

      $this->assertFieldByXPath($field_xpath . $button_xpath_suffix, NULL, t('Found the "add more" button on the initial page.'));

    }

    $this->assertNoDuplicateIds(t('Initial page contains unique IDs'), 'Other');

    // Submit the "add more" button of each form twice. After each corresponding

    // page update, ensure the same as above.

    foreach ($field_xpaths as $form_html_id => $field_xpath) {

      for ($i = 0; $i < 2; $i++) {

        $this->drupalPostAJAX(NULL, array(), array($button_name => $button_value), 'system/ajax', array(), array(), $form_html_id);

        $this->assert(count($this->xpath($field_xpath . $field_items_xpath_suffix)) == $i+2, t('Found the correct number of field items after an AJAX submission.'));

        $this->assertFieldByXPath($field_xpath . $button_xpath_suffix, NULL, t('Found the "add more" button after an AJAX submission.'));

        $this->assertNoDuplicateIds(t('Updated page contains unique IDs'), 'Other');

      }

    }

  }

}

/**

 * Test Ajax forms when page caching for anonymous users is turned on.

 */

class AJAXFormPageCacheTestCase extends AJAXTestCase {

  protected $profile = 'testing';

  public static function getInfo() {

    return array(

      'name' => 'AJAX forms on cached pages',

      'description' => 'Tests that AJAX forms work properly for anonymous users on cached pages.',

      'group' => 'AJAX',

    );

  }

  public function setUp() {

    parent::setUp();

    variable_set('cache', TRUE);

  }

  /**

   * Return the build id of the current form.

   */

  protected function getFormBuildId() {

    $build_id_fields = $this->xpath('//input[@name="form_build_id"]');

    $this->assertEqual(count($build_id_fields), 1, 'One form build id field on the page');

    return (string) $build_id_fields[0]['value'];

  }

  /**

   * Create a simple form, then POST to system/ajax to change to it.

   */

  public function testSimpleAJAXFormValue() {

    $this->drupalGet('ajax_forms_test_get_form');

    $this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS', 'Page was not cached.');

    $build_id_initial = $this->getFormBuildId();

    $edit = array('select' => 'green');

    $commands = $this->drupalPostAJAX(NULL, $edit, 'select');

    $build_id_first_ajax = $this->getFormBuildId();

    $this->assertNotEqual($build_id_initial, $build_id_first_ajax, 'Build id is changed in the simpletest-DOM on first AJAX submission');

    $expected = array(

      'command' => 'updateBuildId',

      'old' => $build_id_initial,

      'new' => $build_id_first_ajax,

    );

    $this->assertCommand($commands, $expected, 'Build id change command issued on first AJAX submission');

    $edit = array('select' => 'red');

    $commands = $this->drupalPostAJAX(NULL, $edit, 'select');

    $build_id_second_ajax = $this->getFormBuildId();

    $this->assertEqual($build_id_first_ajax, $build_id_second_ajax, 'Build id remains the same on subsequent AJAX submissions');

    // Repeat the test sequence but this time with a page loaded from the cache.

    $this->drupalGet('ajax_forms_test_get_form');

    $this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT', 'Page was cached.');

    $build_id_from_cache_initial = $this->getFormBuildId();

    $this->assertEqual($build_id_initial, $build_id_from_cache_initial, 'Build id is the same as on the first request');

    $edit = array('select' => 'green');

    $commands = $this->drupalPostAJAX(NULL, $edit, 'select');

    $build_id_from_cache_first_ajax = $this->getFormBuildId();

    $this->assertNotEqual($build_id_from_cache_initial, $build_id_from_cache_first_ajax, 'Build id is changed in the simpletest-DOM on first AJAX submission');

    $this->assertNotEqual($build_id_first_ajax, $build_id_from_cache_first_ajax, 'Build id from first user is not reused');

    $expected = array(

      'command' => 'updateBuildId',

      'old' => $build_id_from_cache_initial,

      'new' => $build_id_from_cache_first_ajax,

    );

    $this->assertCommand($commands, $expected, 'Build id change command issued on first AJAX submission');

    $edit = array('select' => 'red');

    $commands = $this->drupalPostAJAX(NULL, $edit, 'select');

    $build_id_from_cache_second_ajax = $this->getFormBuildId();

    $this->assertEqual($build_id_from_cache_first_ajax, $build_id_from_cache_second_ajax, 'Build id remains the same on subsequent AJAX submissions');

  }

}

/**

 * Miscellaneous Ajax tests using ajax_test module.

 */

class AJAXElementValidation extends AJAXTestCase {

  public static function getInfo() {

    return array(

      'name' => 'Miscellaneous AJAX tests',

      'description' => 'Various tests of AJAX behavior',

      'group' => 'AJAX',

    );

  }

  /**

   * Try to post an Ajax change to a form that has a validated element.

   *

   * The drivertext field is Ajax-enabled. An additional field is not, but

   * is set to be a required field. In this test the required field is not

   * filled in, and we want to see if the activation of the "drivertext"

   * Ajax-enabled field fails due to the required field being empty.

   */

  function testAJAXElementValidation() {

    $web_user = $this->drupalCreateUser();

    $edit = array('drivertext' => t('some dumb text'));

    // Post with 'drivertext' as the triggering element.

    $post_result = $this->drupalPostAJAX('ajax_validation_test', $edit, 'drivertext');

    // Look for a validation failure in the resultant JSON.

    $this->assertNoText(t('Error message'), "No error message in resultant JSON");

    $this->assertText('ajax_forms_test_validation_form_callback invoked', 'The correct callback was invoked');

  }

}