class JavaScriptTestCase

class JavaScriptTestCase extends DrupalWebTestCase {

  /**
   * Store configured value for JavaScript preprocessing.
   */
  protected $preprocess_js = NULL;
  public static function getInfo() {
    return array(
      'name' => 'JavaScript',
      'description' => 'Tests the JavaScript system.',
      'group' => 'System',
    );
  }
  function setUp() {

    // Enable Locale and SimpleTest in the test environment.
    parent::setUp('locale', 'simpletest', 'common_test');

    // Disable preprocessing
    $this->preprocess_js = variable_get('preprocess_js', 0);
    variable_set('preprocess_js', 0);

    // Reset drupal_add_js() and drupal_add_library() statics before each test.
    drupal_static_reset('drupal_add_js');
    drupal_static_reset('drupal_add_library');
  }
  function tearDown() {

    // Restore configured value for JavaScript preprocessing.
    variable_set('preprocess_js', $this->preprocess_js);
    parent::tearDown();
  }

  /**
   * Test default JavaScript is empty.
   */
  function testDefault() {
    $this
      ->assertEqual(array(), drupal_add_js(), 'Default JavaScript is empty.');
  }

  /**
   * Test adding a JavaScript file.
   */
  function testAddFile() {
    $javascript = drupal_add_js('misc/collapse.js');
    $this
      ->assertTrue(array_key_exists('misc/jquery.js', $javascript), 'jQuery is added when a file is added.');
    $this
      ->assertTrue(array_key_exists('misc/drupal.js', $javascript), 'Drupal.js is added when file is added.');
    $this
      ->assertTrue(array_key_exists('misc/collapse.js', $javascript), 'JavaScript files are correctly added.');
    $this
      ->assertEqual(base_path(), $javascript['settings']['data'][0]['basePath'], 'Base path JavaScript setting is correctly set.');
    url('', array(
      'prefix' => &$prefix,
    ));
    $this
      ->assertEqual(empty($prefix) ? '' : $prefix, $javascript['settings']['data'][1]['pathPrefix'], 'Path prefix JavaScript setting is correctly set.');
  }

  /**
   * Test adding settings.
   */
  function testAddSetting() {
    $javascript = drupal_add_js(array(
      'drupal' => 'rocks',
      'dries' => 280342800,
    ), 'setting');
    $this
      ->assertEqual(280342800, $javascript['settings']['data'][2]['dries'], 'JavaScript setting is set correctly.');
    $this
      ->assertEqual('rocks', $javascript['settings']['data'][2]['drupal'], 'The other JavaScript setting is set correctly.');
  }

  /**
   * Tests adding an external JavaScript File.
   */
  function testAddExternal() {
    $path = 'http://example.com/script.js';
    $javascript = drupal_add_js($path, 'external');
    $this
      ->assertTrue(array_key_exists('http://example.com/script.js', $javascript), 'Added an external JavaScript file.');
  }

  /**
   * Test drupal_get_js() for JavaScript settings.
   */
  function testHeaderSetting() {

    // Only the second of these two entries should appear in Drupal.settings.
    drupal_add_js(array(
      'commonTest' => 'commonTestShouldNotAppear',
    ), 'setting');
    drupal_add_js(array(
      'commonTest' => 'commonTestShouldAppear',
    ), 'setting');

    // All three of these entries should appear in Drupal.settings.
    drupal_add_js(array(
      'commonTestArray' => array(
        'commonTestValue0',
      ),
    ), 'setting');
    drupal_add_js(array(
      'commonTestArray' => array(
        'commonTestValue1',
      ),
    ), 'setting');
    drupal_add_js(array(
      'commonTestArray' => array(
        'commonTestValue2',
      ),
    ), 'setting');

    // Only the second of these two entries should appear in Drupal.settings.
    drupal_add_js(array(
      'commonTestArray' => array(
        'key' => 'commonTestOldValue',
      ),
    ), 'setting');
    drupal_add_js(array(
      'commonTestArray' => array(
        'key' => 'commonTestNewValue',
      ),
    ), 'setting');
    $javascript = drupal_get_js('header');
    $this
      ->assertTrue(strpos($javascript, 'basePath') > 0, 'Rendered JavaScript header returns basePath setting.');
    $this
      ->assertTrue(strpos($javascript, 'misc/jquery.js') > 0, 'Rendered JavaScript header includes jQuery.');
    $this
      ->assertTrue(strpos($javascript, 'pathPrefix') > 0, 'Rendered JavaScript header returns pathPrefix setting.');

    // Test whether drupal_add_js can be used to override a previous setting.
    $this
      ->assertTrue(strpos($javascript, 'commonTestShouldAppear') > 0, 'Rendered JavaScript header returns custom setting.');
    $this
      ->assertTrue(strpos($javascript, 'commonTestShouldNotAppear') === FALSE, 'drupal_add_js() correctly overrides a custom setting.');

    // Test whether drupal_add_js can be used to add numerically indexed values
    // to an array.
    $array_values_appear = strpos($javascript, 'commonTestValue0') > 0 && strpos($javascript, 'commonTestValue1') > 0 && strpos($javascript, 'commonTestValue2') > 0;
    $this
      ->assertTrue($array_values_appear, 'drupal_add_js() correctly adds settings to the end of an indexed array.');

    // Test whether drupal_add_js can be used to override the entry for an
    // existing key in an associative array.
    $associative_array_override = strpos($javascript, 'commonTestNewValue') > 0 && strpos($javascript, 'commonTestOldValue') === FALSE;
    $this
      ->assertTrue($associative_array_override, 'drupal_add_js() correctly overrides settings within an associative array.');
  }

  /**
   * Test to see if resetting the JavaScript empties the cache.
   */
  function testReset() {
    drupal_add_js('misc/collapse.js');
    drupal_static_reset('drupal_add_js');
    $this
      ->assertEqual(array(), drupal_add_js(), 'Resetting the JavaScript correctly empties the cache.');
  }

  /**
   * Test adding inline scripts.
   */
  function testAddInline() {
    $inline = 'jQuery(function () { });';
    $javascript = drupal_add_js($inline, array(
      'type' => 'inline',
      'scope' => 'footer',
    ));
    $this
      ->assertTrue(array_key_exists('misc/jquery.js', $javascript), 'jQuery is added when inline scripts are added.');
    $data = end($javascript);
    $this
      ->assertEqual($inline, $data['data'], 'Inline JavaScript is correctly added to the footer.');
  }

  /**
   * Test rendering an external JavaScript file.
   */
  function testRenderExternal() {
    $external = 'http://example.com/example.js';
    drupal_add_js($external, 'external');
    $javascript = drupal_get_js();

    // Local files have a base_path() prefix, external files should not.
    $this
      ->assertTrue(strpos($javascript, 'src="' . $external) > 0, 'Rendering an external JavaScript file.');
  }

  /**
   * Test drupal_get_js() with a footer scope.
   */
  function testFooterHTML() {
    $inline = 'jQuery(function () { });';
    drupal_add_js($inline, array(
      'type' => 'inline',
      'scope' => 'footer',
    ));
    $javascript = drupal_get_js('footer');
    $this
      ->assertTrue(strpos($javascript, $inline) > 0, 'Rendered JavaScript footer returns the inline code.');
  }

  /**
   * Test the 'javascript_always_use_jquery' variable.
   */
  function testJavaScriptAlwaysUseJQuery() {

    // The default front page of the site should use jQuery and other standard
    // scripts and settings.
    $this
      ->drupalGet('');
    $this
      ->assertRaw('misc/jquery.js', 'Default behavior: The front page of the site includes jquery.js.');
    $this
      ->assertRaw('misc/drupal.js', 'Default behavior: The front page of the site includes drupal.js.');
    $this
      ->assertRaw('Drupal.settings', 'Default behavior: The front page of the site includes Drupal settings.');
    $this
      ->assertRaw('basePath', 'Default behavior: The front page of the site includes the basePath Drupal setting.');

    // The default front page should not use jQuery and other standard scripts
    // and settings when the 'javascript_always_use_jquery' variable is set to
    // FALSE.
    variable_set('javascript_always_use_jquery', FALSE);
    $this
      ->drupalGet('');
    $this
      ->assertNoRaw('misc/jquery.js', 'When "javascript_always_use_jquery" is FALSE: The front page of the site does not include jquery.js.');
    $this
      ->assertNoRaw('misc/drupal.js', 'When "javascript_always_use_jquery" is FALSE: The front page of the site does not include drupal.js.');
    $this
      ->assertNoRaw('Drupal.settings', 'When "javascript_always_use_jquery" is FALSE: The front page of the site does not include Drupal settings.');
    $this
      ->assertNoRaw('basePath', 'When "javascript_always_use_jquery" is FALSE: The front page of the site does not include the basePath Drupal setting.');
    variable_del('javascript_always_use_jquery');

    // When only settings have been added via drupal_add_js(), drupal_get_js()
    // should still return jQuery and other standard scripts and settings.
    $this
      ->resetStaticVariables();
    drupal_add_js(array(
      'testJavaScriptSetting' => 'test',
    ), 'setting');
    $javascript = drupal_get_js();
    $this
      ->assertTrue(strpos($javascript, 'misc/jquery.js') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when only settings have been added includes jquery.js.');
    $this
      ->assertTrue(strpos($javascript, 'misc/drupal.js') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when only settings have been added includes drupal.js.');
    $this
      ->assertTrue(strpos($javascript, 'Drupal.settings') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when only settings have been added includes Drupal.settings.');
    $this
      ->assertTrue(strpos($javascript, 'basePath') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when only settings have been added includes the basePath Drupal setting.');
    $this
      ->assertTrue(strpos($javascript, 'testJavaScriptSetting') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when only settings have been added includes the added Drupal settings.');

    // When only settings have been added via drupal_add_js() and the
    // 'javascript_always_use_jquery' variable is set to FALSE, drupal_get_js()
    // should not return jQuery and other standard scripts and settings, nor
    // should it return the requested settings (since they cannot actually be
    // addded to the page without jQuery).
    $this
      ->resetStaticVariables();
    variable_set('javascript_always_use_jquery', FALSE);
    drupal_add_js(array(
      'testJavaScriptSetting' => 'test',
    ), 'setting');
    $javascript = drupal_get_js();
    $this
      ->assertTrue(strpos($javascript, 'misc/jquery.js') === FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when only settings have been added does not include jquery.js.');
    $this
      ->assertTrue(strpos($javascript, 'misc/drupal.js') === FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when only settings have been added does not include drupal.js.');
    $this
      ->assertTrue(strpos($javascript, 'Drupal.settings') === FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when only settings have been added does not include Drupal.settings.');
    $this
      ->assertTrue(strpos($javascript, 'basePath') === FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when only settings have been added does not include the basePath Drupal setting.');
    $this
      ->assertTrue(strpos($javascript, 'testJavaScriptSetting') === FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when only settings have been added does not include the added Drupal settings.');
    variable_del('javascript_always_use_jquery');

    // When a regular file has been added via drupal_add_js(), drupal_get_js()
    // should return jQuery and other standard scripts and settings.
    $this
      ->resetStaticVariables();
    drupal_add_js('misc/collapse.js');
    $javascript = drupal_get_js();
    $this
      ->assertTrue(strpos($javascript, 'misc/jquery.js') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when a custom JavaScript file has been added includes jquery.js.');
    $this
      ->assertTrue(strpos($javascript, 'misc/drupal.js') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when a custom JavaScript file has been added includes drupal.js.');
    $this
      ->assertTrue(strpos($javascript, 'Drupal.settings') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when a custom JavaScript file has been added includes Drupal.settings.');
    $this
      ->assertTrue(strpos($javascript, 'basePath') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when a custom JavaScript file has been added includes the basePath Drupal setting.');
    $this
      ->assertTrue(strpos($javascript, 'misc/collapse.js') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when a custom JavaScript file has been added includes the custom file.');

    // When a regular file has been added via drupal_add_js() and the
    // 'javascript_always_use_jquery' variable is set to FALSE, drupal_get_js()
    // should still return jQuery and other standard scripts and settings
    // (since the file is assumed to require jQuery by default).
    $this
      ->resetStaticVariables();
    variable_set('javascript_always_use_jquery', FALSE);
    drupal_add_js('misc/collapse.js');
    $javascript = drupal_get_js();
    $this
      ->assertTrue(strpos($javascript, 'misc/jquery.js') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when a custom JavaScript file has been added includes jquery.js.');
    $this
      ->assertTrue(strpos($javascript, 'misc/drupal.js') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when a custom JavaScript file has been added includes drupal.js.');
    $this
      ->assertTrue(strpos($javascript, 'Drupal.settings') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when a custom JavaScript file has been added includes Drupal.settings.');
    $this
      ->assertTrue(strpos($javascript, 'basePath') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when a custom JavaScript file has been added includes the basePath Drupal setting.');
    $this
      ->assertTrue(strpos($javascript, 'misc/collapse.js') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when a custom JavaScript file has been added includes the custom file.');
    variable_del('javascript_always_use_jquery');

    // When a file that does not require jQuery has been added via
    // drupal_add_js(), drupal_get_js() should still return jQuery and other
    // standard scripts and settings by default.
    $this
      ->resetStaticVariables();
    drupal_add_js('misc/collapse.js', array(
      'requires_jquery' => FALSE,
    ));
    $javascript = drupal_get_js();
    $this
      ->assertTrue(strpos($javascript, 'misc/jquery.js') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when a custom JavaScript file that does not require jQuery has been added includes jquery.js.');
    $this
      ->assertTrue(strpos($javascript, 'misc/drupal.js') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when a custom JavaScript file that does not require jQuery has been added includes drupal.js.');
    $this
      ->assertTrue(strpos($javascript, 'Drupal.settings') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when a custom JavaScript file that does not require jQuery has been added includes Drupal.settings.');
    $this
      ->assertTrue(strpos($javascript, 'basePath') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when a custom JavaScript file that does not require jQuery has been added includes the basePath Drupal setting.');
    $this
      ->assertTrue(strpos($javascript, 'misc/collapse.js') !== FALSE, 'Default behavior: The JavaScript returned by drupal_get_js() when a custom JavaScript file that does not require jQuery has been added includes the custom file.');

    // When a file that does not require jQuery has been added via
    // drupal_add_js() and the 'javascript_always_use_jquery' variable is set
    // to FALSE, drupal_get_js() should not return jQuery and other standard
    // scripts and setting, but it should still return the requested file.
    $this
      ->resetStaticVariables();
    variable_set('javascript_always_use_jquery', FALSE);
    drupal_add_js('misc/collapse.js', array(
      'requires_jquery' => FALSE,
    ));
    $javascript = drupal_get_js();
    $this
      ->assertTrue(strpos($javascript, 'misc/jquery.js') === FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when a custom JavaScript file that does not require jQuery has been added does not include jquery.js.');
    $this
      ->assertTrue(strpos($javascript, 'misc/drupal.js') === FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when a custom JavaScript file that does not require jQuery has been added does not include drupal.js.');
    $this
      ->assertTrue(strpos($javascript, 'Drupal.settings') === FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when a custom JavaScript file that does not require jQuery has been added does not include Drupal.settings.');
    $this
      ->assertTrue(strpos($javascript, 'basePath') === FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when a custom JavaScript file that does not require jQuery has been added does not include the basePath Drupal setting.');
    $this
      ->assertTrue(strpos($javascript, 'misc/collapse.js') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when a custom JavaScript file that does not require jQuery has been added includes the custom file.');
    variable_del('javascript_always_use_jquery');

    // When 'javascript_always_use_jquery' is set to FALSE and a file that does
    // not require jQuery is added, followed by one that does, drupal_get_js()
    // should return jQuery and other standard scripts and settings, in
    // addition to both of the requested files.
    $this
      ->resetStaticVariables();
    variable_set('javascript_always_use_jquery', FALSE);
    drupal_add_js('misc/collapse.js', array(
      'requires_jquery' => FALSE,
    ));
    drupal_add_js('misc/ajax.js');
    $javascript = drupal_get_js();
    $this
      ->assertTrue(strpos($javascript, 'misc/jquery.js') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when at least one custom JavaScript file that requires jQuery has been added includes jquery.js.');
    $this
      ->assertTrue(strpos($javascript, 'misc/drupal.js') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when at least one custom JavaScript file that requires jQuery has been added includes drupal.js.');
    $this
      ->assertTrue(strpos($javascript, 'Drupal.settings') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when at least one custom JavaScript file that requires jQuery has been added includes Drupal.settings.');
    $this
      ->assertTrue(strpos($javascript, 'basePath') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when at least one custom JavaScript file that requires jQuery has been added includes the basePath Drupal setting.');
    $this
      ->assertTrue(strpos($javascript, 'misc/collapse.js') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when at least one custom JavaScript file that requires jQuery has been added includes the first custom file.');
    $this
      ->assertTrue(strpos($javascript, 'misc/ajax.js') !== FALSE, 'When "javascript_always_use_jquery" is FALSE: The JavaScript returned by drupal_get_js() when at least one custom JavaScript file that requires jQuery has been added includes the second custom file.');
    variable_del('javascript_always_use_jquery');
  }

  /**
   * Test drupal_add_js() sets preproccess to false when cache is set to false.
   */
  function testNoCache() {
    $javascript = drupal_add_js('misc/collapse.js', array(
      'cache' => FALSE,
    ));
    $this
      ->assertFalse($javascript['misc/collapse.js']['preprocess'], 'Setting cache to FALSE sets proprocess to FALSE when adding JavaScript.');
  }

  /**
   * Test adding a JavaScript file with a different group.
   */
  function testDifferentGroup() {
    $javascript = drupal_add_js('misc/collapse.js', array(
      'group' => JS_THEME,
    ));
    $this
      ->assertEqual($javascript['misc/collapse.js']['group'], JS_THEME, 'Adding a JavaScript file with a different group caches the given group.');
  }

  /**
   * Test adding a JavaScript file with a different weight.
   */
  function testDifferentWeight() {
    $javascript = drupal_add_js('misc/collapse.js', array(
      'weight' => 2,
    ));
    $this
      ->assertEqual($javascript['misc/collapse.js']['weight'], 2, 'Adding a JavaScript file with a different weight caches the given weight.');
  }

  /**
   * Tests JavaScript aggregation when files are added to a different scope.
   */
  function testAggregationOrder() {

    // Enable JavaScript aggregation.
    variable_set('preprocess_js', 1);
    drupal_static_reset('drupal_add_js');

    // Add two JavaScript files to the current request and build the cache.
    drupal_add_js('misc/ajax.js');
    drupal_add_js('misc/autocomplete.js');
    $js_items = drupal_add_js();
    drupal_build_js_cache(array(
      'misc/ajax.js' => $js_items['misc/ajax.js'],
      'misc/autocomplete.js' => $js_items['misc/autocomplete.js'],
    ));

    // Store the expected key for the first item in the cache.
    $cache = array_keys(variable_get('drupal_js_cache_files', array()));
    $expected_key = $cache[0];

    // Reset variables and add a file in a different scope first.
    variable_del('drupal_js_cache_files');
    drupal_static_reset('drupal_add_js');
    drupal_add_js('some/custom/javascript_file.js', array(
      'scope' => 'footer',
    ));
    drupal_add_js('misc/ajax.js');
    drupal_add_js('misc/autocomplete.js');

    // Rebuild the cache.
    $js_items = drupal_add_js();
    drupal_build_js_cache(array(
      'misc/ajax.js' => $js_items['misc/ajax.js'],
      'misc/autocomplete.js' => $js_items['misc/autocomplete.js'],
    ));

    // Compare the expected key for the first file to the current one.
    $cache = array_keys(variable_get('drupal_js_cache_files', array()));
    $key = $cache[0];
    $this
      ->assertEqual($key, $expected_key, 'JavaScript aggregation is not affected by ordering in different scopes.');
  }

  /**
   * Test JavaScript ordering.
   */
  function testRenderOrder() {

    // Add a bunch of JavaScript in strange ordering.
    drupal_add_js('(function($){alert("Weight 5 #1");})(jQuery);', array(
      'type' => 'inline',
      'scope' => 'footer',
      'weight' => 5,
    ));
    drupal_add_js('(function($){alert("Weight 0 #1");})(jQuery);', array(
      'type' => 'inline',
      'scope' => 'footer',
    ));
    drupal_add_js('(function($){alert("Weight 0 #2");})(jQuery);', array(
      'type' => 'inline',
      'scope' => 'footer',
    ));
    drupal_add_js('(function($){alert("Weight -8 #1");})(jQuery);', array(
      'type' => 'inline',
      'scope' => 'footer',
      'weight' => -8,
    ));
    drupal_add_js('(function($){alert("Weight -8 #2");})(jQuery);', array(
      'type' => 'inline',
      'scope' => 'footer',
      'weight' => -8,
    ));
    drupal_add_js('(function($){alert("Weight -8 #3");})(jQuery);', array(
      'type' => 'inline',
      'scope' => 'footer',
      'weight' => -8,
    ));
    drupal_add_js('http://example.com/example.js?Weight -5 #1', array(
      'type' => 'external',
      'scope' => 'footer',
      'weight' => -5,
    ));
    drupal_add_js('(function($){alert("Weight -8 #4");})(jQuery);', array(
      'type' => 'inline',
      'scope' => 'footer',
      'weight' => -8,
    ));
    drupal_add_js('(function($){alert("Weight 5 #2");})(jQuery);', array(
      'type' => 'inline',
      'scope' => 'footer',
      'weight' => 5,
    ));
    drupal_add_js('(function($){alert("Weight 0 #3");})(jQuery);', array(
      'type' => 'inline',
      'scope' => 'footer',
    ));

    // Construct the expected result from the regex.
    $expected = array(
      "-8 #1",
      "-8 #2",
      "-8 #3",
      "-8 #4",
      "-5 #1",
      // The external script.
      "0 #1",
      "0 #2",
      "0 #3",
      "5 #1",
      "5 #2",
    );

    // Retrieve the rendered JavaScript and test against the regex.
    $js = drupal_get_js('footer');
    $matches = array();
    if (preg_match_all('/Weight\\s([-0-9]+\\s[#0-9]+)/', $js, $matches)) {
      $result = $matches[1];
    }
    else {
      $result = array();
    }
    $this
      ->assertIdentical($result, $expected, 'JavaScript is added in the expected weight order.');
  }

  /**
   * Test rendering the JavaScript with a file's weight above jQuery's.
   */
  function testRenderDifferentWeight() {

    // JavaScript files are sorted first by group, then by the 'every_page'
    // flag, then by weight (see drupal_sort_css_js()), so to test the effect of
    // weight, we need the other two options to be the same.
    drupal_add_js('misc/collapse.js', array(
      'group' => JS_LIBRARY,
      'every_page' => TRUE,
      'weight' => -21,
    ));
    $javascript = drupal_get_js();
    $this
      ->assertTrue(strpos($javascript, 'misc/collapse.js') < strpos($javascript, 'misc/jquery.js'), 'Rendering a JavaScript file above jQuery.');
  }

  /**
   * Test altering a JavaScript's weight via hook_js_alter().
   *
   * @see simpletest_js_alter()
   */
  function testAlter() {

    // Add both tableselect.js and simpletest.js, with a larger weight on SimpleTest.
    drupal_add_js('misc/tableselect.js');
    drupal_add_js(drupal_get_path('module', 'simpletest') . '/simpletest.js', array(
      'weight' => 9999,
    ));

    // Render the JavaScript, testing if simpletest.js was altered to be before
    // tableselect.js. See simpletest_js_alter() to see where this alteration
    // takes place.
    $javascript = drupal_get_js();
    $this
      ->assertTrue(strpos($javascript, 'simpletest.js') < strpos($javascript, 'misc/tableselect.js'), 'Altering JavaScript weight through the alter hook.');
  }

  /**
   * Adds a library to the page and tests for both its JavaScript and its CSS.
   */
  function testLibraryRender() {
    $result = drupal_add_library('system', 'farbtastic');
    $this
      ->assertTrue($result !== FALSE, 'Library was added without errors.');
    $scripts = drupal_get_js();
    $styles = drupal_get_css();
    $this
      ->assertTrue(strpos($scripts, 'misc/farbtastic/farbtastic.js'), 'JavaScript of library was added to the page.');
    $this
      ->assertTrue(strpos($styles, 'misc/farbtastic/farbtastic.css'), 'Stylesheet of library was added to the page.');
  }

  /**
   * Adds a JavaScript library to the page and alters it.
   *
   * @see common_test_library_alter()
   */
  function testLibraryAlter() {

    // Verify that common_test altered the title of Farbtastic.
    $library = drupal_get_library('system', 'farbtastic');
    $this
      ->assertEqual($library['title'], 'Farbtastic: Altered Library', 'Registered libraries were altered.');

    // common_test_library_alter() also added a dependency on jQuery Form.
    drupal_add_library('system', 'farbtastic');
    $scripts = drupal_get_js();
    $this
      ->assertTrue(strpos($scripts, 'misc/jquery.form.js'), 'Altered library dependencies are added to the page.');
  }

  /**
   * Tests that multiple modules can implement the same library.
   *
   * @see common_test_library()
   */
  function testLibraryNameConflicts() {
    $farbtastic = drupal_get_library('common_test', 'farbtastic');
    $this
      ->assertEqual($farbtastic['title'], 'Custom Farbtastic Library', 'Alternative libraries can be added to the page.');
  }

  /**
   * Tests non-existing libraries.
   */
  function testLibraryUnknown() {
    $result = drupal_get_library('unknown', 'unknown');
    $this
      ->assertFalse($result, 'Unknown library returned FALSE.');
    drupal_static_reset('drupal_get_library');
    $result = drupal_add_library('unknown', 'unknown');
    $this
      ->assertFalse($result, 'Unknown library returned FALSE.');
    $scripts = drupal_get_js();
    $this
      ->assertTrue(strpos($scripts, 'unknown') === FALSE, 'Unknown library was not added to the page.');
  }

  /**
   * Tests the addition of libraries through the #attached['library'] property.
   */
  function testAttachedLibrary() {
    $element['#attached']['library'][] = array(
      'system',
      'farbtastic',
    );
    drupal_render($element);
    $scripts = drupal_get_js();
    $this
      ->assertTrue(strpos($scripts, 'misc/farbtastic/farbtastic.js'), 'The attached_library property adds the additional libraries.');
  }

  /**
   * Tests retrieval of libraries via drupal_get_library().
   */
  function testGetLibrary() {

    // Retrieve all libraries registered by a module.
    $libraries = drupal_get_library('common_test');
    $this
      ->assertTrue(isset($libraries['farbtastic']), 'Retrieved all module libraries.');

    // Retrieve all libraries for a module not implementing hook_library().
    // Note: This test installs Locale module.
    $libraries = drupal_get_library('locale');
    $this
      ->assertEqual($libraries, array(), 'Retrieving libraries from a module not implementing hook_library() returns an emtpy array.');

    // Retrieve a specific library by module and name.
    $farbtastic = drupal_get_library('common_test', 'farbtastic');
    $this
      ->assertEqual($farbtastic['version'], '5.3', 'Retrieved a single library.');

    // Retrieve a non-existing library by module and name.
    $farbtastic = drupal_get_library('common_test', 'foo');
    $this
      ->assertIdentical($farbtastic, FALSE, 'Retrieving a non-existing library returns FALSE.');
  }

  /**
   * Tests that the query string remains intact when adding JavaScript files
   *  that have query string parameters.
   */
  function testAddJsFileWithQueryString() {
    $this
      ->drupalGet('common-test/query-string');
    $query_string = variable_get('css_js_query_string', '0');
    $this
      ->assertRaw(drupal_get_path('module', 'node') . '/node.js?' . $query_string, 'Query string was appended correctly to js.');
  }

  /**
   * Resets static variables related to adding JavaScript to a page.
   */
  function resetStaticVariables() {
    drupal_static_reset('drupal_add_js');
    drupal_static_reset('drupal_add_library');
    drupal_static_reset('drupal_get_library');
  }

}