diff --git a/core/modules/simpletest/tests/form.test b/core/modules/simpletest/tests/form.test
index 23bec0e..883237b 100644
--- a/core/modules/simpletest/tests/form.test
+++ b/core/modules/simpletest/tests/form.test
@@ -1075,9 +1075,11 @@ class FormsFormWrapperTestCase extends DrupalWebTestCase {
 }
 
 /**
- * Test error class handling.
+ * Tests error class handling.
  */
 class FormsErrorClassTestCase extends DrupalWebTestCase {
+  protected $profile = 'testing';
+
   public static function getInfo() {
     return array(
       'name' => 'Form element error class',
@@ -1094,29 +1096,32 @@ class FormsErrorClassTestCase extends DrupalWebTestCase {
    * Tests if the error class is applied to all three texfields on a form.
    */
   function testErrorClasses() {
+    // Submitting with the default values should not pass validation.
     $edit = array();
-    $this->drupalPost('form-test/error-classes', $edit, t('Submit'));
-    $this->assertFieldByXPath('//input[@name="title1" and contains(@class,"error")]', "DEFAULT", 'Error class added to title1.');
-    $this->assertFieldByXPath('//input[@name="title2" and contains(@class,"error")]', "DEFAULT", 'Error class added to title2.');
-    $this->assertFieldByXPath('//input[@name="title3" and contains(@class,"error")]', "DEFAULT", 'Error class added to title3.');
-    $this->assertFieldByXPath('//input[@name="tree[trunk]" and contains(@class,"error")]', "", 'Error class added to tree[trunk].');
-    $this->assertNoText('form_test_error_class success.', t('The form failed validation.'));
-
+    $this->drupalPost('form-test/error-classes', $edit, 'Submit');
+    $this->assertFieldByXPath('//input[@name="title1" and contains(@class,"error")]', 'DEFAULT', 'Error class added to title1.');
+    $this->assertFieldByXPath('//input[@name="title2" and contains(@class,"error")]', 'DEFAULT', 'Error class added to title2.');
+    $this->assertFieldByXPath('//input[@name="title3" and contains(@class,"error")]', 'DEFAULT', 'Error class added to title3.');
+    $this->assertFieldByXPath('//input[@name="tree[trunk]" and contains(@class,"error")]', '', 'Error class added to tree[trunk].');
+    $this->assertNoText('form_test_error_class success.', 'The form failed validation.');
+
+    // Submitting with non-unique random values should not pass validation.
     $edit['title3'] = $edit['title2'] = $edit['title1'] = $edit['tree[trunk]'] = $this->randomName();
-    $this->drupalPost('form-test/error-classes', $edit, t('Submit'));
+    $this->drupalPost('form-test/error-classes', $edit, 'Submit');
     $this->assertFieldByXPath('//input[@name="title1" and contains(@class,"error")]', $edit['title1'], 'Error class added to title1.');
     $this->assertFieldByXPath('//input[@name="title2" and contains(@class,"error")]', $edit['title2'], 'Error class added to title2.');
     $this->assertFieldByXPath('//input[@name="title3" and contains(@class,"error")]', $edit['title3'], 'Error class added to title3.');
-    $this->assertNoText('form_test_error_class success.', t('The form failed validation.'));
+    $this->assertNoText('form_test_error_class success.', 'The form failed validation.');
 
+    // Submitting with unique values should pass validation.
     $edit['title2'] = $edit['title1'] . $this->randomName();
     $edit['title3'] = $edit['title2'] . $this->randomName();
-    $this->drupalPost('form-test/error-classes', $edit, t('Submit'));
+    $this->drupalPost('form-test/error-classes', $edit, 'Submit');
     $this->assertNoFieldByXPath('//input[@name="title1" and contains(@class,"error")]', $edit['title1'], 'Error class not added to title1.');
     $this->assertNoFieldByXPath('//input[@name="title2" and contains(@class,"error")]', $edit['title2'], 'Error class not added to title2.');
     $this->assertNoFieldByXPath('//input[@name="title3" and contains(@class,"error")]', $edit['title3'], 'Error class not added to title3.');
     $this->assertNoFieldByXPath('//input[@name="tree[trunk]" and contains(@class,"error")]', $edit['tree[trunk]'], 'Error class not added to tree[trunk].');
-    $this->assertText('form_test_error_class success.', t('The form passed validation.'));
+    $this->assertText('form_test_error_class success.', 'The form passed validation.');
   }
 }
 
diff --git a/core/modules/simpletest/tests/form_test.module b/core/modules/simpletest/tests/form_test.module
index caa25f0..ea84dfa 100644
--- a/core/modules/simpletest/tests/form_test.module
+++ b/core/modules/simpletest/tests/form_test.module
@@ -1438,6 +1438,11 @@ function form_test_form_form_test_state_persist_alter(&$form, &$form_state) {
 
 /**
  * Form constructor for testing error classes.
+ *
+ * @see form_test_error_class_validate()
+ * @see form_test_error_class_tree_validate()
+ * @see form_test_error_class_submit()
+ * @ingroup forms
  */
 function form_test_error_class($form, &$form_state) {
   // Three textfeilds with the same default value.
@@ -1470,13 +1475,17 @@ function form_test_error_class($form, &$form_state) {
   );
   $form['submit'] = array(
     '#type' => 'submit',
-    '#value' => t('Submit'),
+    '#value' => 'Submit',
   );
   return $form;
 }
 
 /**
- * Form validation handler which requires all title values to be unique.
+ * Form validation handler for form_test_error_class().
+ *
+ * Requires all title values to be unique.
+ *
+ * @see form_test_error_class_submit()
  */
 function form_test_error_class_validate($form, &$form_state) {
   $values[] = $form_state['values']['title1'];
@@ -1491,7 +1500,11 @@ function form_test_error_class_validate($form, &$form_state) {
 }
 
 /**
- * Element validation handler which requires the element value to be not empty.
+ * Form element validation handler for 'trunk' in form_test_error_class().
+ *
+ * Requires the element value to be not empty.
+ *
+ * @see form_test_error_class_submit()
  */
 function form_test_error_class_tree_validate($element, &$form_state) {
   if (empty($element['#value'])) {
@@ -1500,7 +1513,12 @@ function form_test_error_class_tree_validate($element, &$form_state) {
 }
 
 /**
- * Form submit handler that just sets a message.
+ * Form submission handler for form_test_error_class().
+ *
+ * Justs sets a success message.
+ *
+ * @see form_test_error_class_validate()
+ * @see form_test_error_class_tree_validate()
  */
 function form_test_error_class_submit($form, &$form_state) {
   drupal_set_message('form_test_error_class success.');