diff --git a/core/modules/simpletest/tests/form.test b/core/modules/simpletest/tests/form.test
index 70ebf86..222549a 100644
--- a/core/modules/simpletest/tests/form.test
+++ b/core/modules/simpletest/tests/form.test
@@ -122,6 +122,50 @@ class FormsTestCase extends DrupalWebTestCase {
   }
 
   /**
+   * Tests #required checkboxes and radios.
+   *
+   * Programmatically submits a test form containing several types of input
+   * elements. The form is submitted twice, once with values and once without,
+   * and each is checked for the proper #required error messages.
+   *
+   * @see form_test_validate_required_form()
+   * @see form_test_element_validate()
+   */
+  function testRequiredCheckboxesRadio() {
+    $form = $form_state = array();
+    $form = form_test_validate_required_form($form, $form_state);
+
+    // Verify each error message shows when required value not selected.
+    $edit = array();
+    $this->drupalPost('form-test/validate-required', $edit, 'Submit');
+
+    foreach (array('textfield', 'checkboxes', 'select', 'radios') as $key) {
+      $this->assertText(t('!name field is required.', array('!name' => $form[$key]['#title'])));
+    }
+
+    // No invalid options were submitted, only empty ones. Therefore, the error
+    // message about disallowed values should not appear, nor should our custom
+    // validator report that the value is not found.
+    $this->assertNoText(t('illegal choice'));
+    $this->assertNoText(t('Value is not allowed'));
+
+    // Verify that no errors appear with valid values.
+    $edit = array(
+      'textfield' => $this->randomString(),
+      'checkboxes[foo]' => TRUE,
+      'select' => 'foo',
+      'radios' => 'bar',
+    );
+    $this->drupalPost('form-test/validate-required', $edit, 'Submit');
+
+    foreach (array('textfield', 'checkboxes', 'select', 'radios') as $key) {
+      $this->assertNoText(t('!name field is required.', array('!name' => $form[$key]['#title'])));
+    }
+    $this->assertNoText(t('illegal choice'));
+    $this->assertNoText(t('Value is not allowed'));
+  }
+
+  /**
    * Test default value handling for checkboxes.
    *
    * @see _form_test_checkbox()
diff --git a/core/modules/simpletest/tests/form_test.module b/core/modules/simpletest/tests/form_test.module
index 0393b18..6f57d92 100644
--- a/core/modules/simpletest/tests/form_test.module
+++ b/core/modules/simpletest/tests/form_test.module
@@ -23,6 +23,12 @@ function form_test_menu() {
     'access arguments' => array('access content'),
     'type' => MENU_CALLBACK,
   );
+  $items['form-test/validate-required'] = array(
+    'title' => 'Form #required validation',
+    'page callback' => 'drupal_get_form',
+    'page arguments' => array('form_test_validate_required_form'),
+    'access callback' => TRUE,
+  );
   $items['form-test/limit-validation-errors'] = array(
     'title' => 'Form validation with some error suppression',
     'page callback' => 'drupal_get_form',
@@ -346,6 +352,79 @@ function form_test_validate_form_validate(&$form, &$form_state) {
 }
 
 /**
+ * Form constructor for a form to test the #required property.
+ */
+function form_test_validate_required_form($form, &$form_state) {
+  $form['textfield'] = array(
+    '#type' => 'textfield',
+    '#title' => 'Textfield',
+    '#required' => TRUE,
+    '#element_validate' => array('form_test_element_validate'),
+  );
+  $form['checkboxes'] = array(
+    '#type' => 'checkboxes',
+    '#title' => 'Checkboxes',
+    '#options' => drupal_map_assoc(array('foo', 'bar')),
+    '#required' => TRUE,
+    '#element_validate' => array('form_test_element_validate'),
+  );
+  $form['select'] = array(
+    '#type' => 'select',
+    '#title' => 'Select',
+    '#options' => drupal_map_assoc(array('foo', 'bar')),
+    '#required' => TRUE,
+    '#element_validate' => array('form_test_element_validate'),
+  );
+  $form['radios'] = array(
+    '#type' => 'radios',
+    '#title' => 'Radios',
+    '#options' => drupal_map_assoc(array('foo', 'bar')),
+    '#required' => TRUE,
+    '#element_validate' => array('form_test_element_validate'),
+  );
+  $form['radios_optional'] = array(
+    '#type' => 'radios',
+    '#title' => 'Radios (optional)',
+    '#options' => drupal_map_assoc(array('foo', 'bar')),
+    '#element_validate' => array('form_test_element_validate'),
+  );
+  $form['actions'] = array('#type' => 'actions');
+  $form['actions']['submit'] = array('#type' => 'submit', '#value' => 'Submit');
+  return $form;
+}
+
+/**
+ * Form element validation handler for form_test_validate_required_form().
+ *
+ * Checks the form element for values that are not in the allowed values,
+ * using logic from _form_validate().
+ */
+function form_test_element_validate($element, &$form_state, $form) {
+  if (isset($element['#options']) && isset($element['#value'])) {
+    if ($element['#type'] == 'select') {
+      $options = form_options_flatten($element['#options']);
+    }
+    else {
+      $options = $element['#options'];
+    }
+    if (is_array($element['#value'])) {
+      $value = in_array($element['#type'], array('checkboxes', 'tableselect')) ? array_keys($element['#value']) : $element['#value'];
+      foreach ($value as $v) {
+        if (!isset($options[$v])) {
+          drupal_set_message("Value is not allowed for {$element['#name']}.");
+        }
+      }
+    }
+    elseif ($element['#type'] == 'select' && !$element['#multiple'] && $element['#required'] && !isset($element['#default_value']) && $element['#value'] === $element['#empty_value']) {
+      drupal_set_message("Value is not allowed for {$element['#name']}.");
+    }
+    elseif (!isset($options[$element['#value']])) {
+      drupal_set_message("Value is not allowed for {$element['#name']}.");
+    }
+  }
+}
+
+/**
  * Builds a simple form with a button triggering partial validation.
  */
 function form_test_limit_validation_errors_form($form, &$form_state) {