#335035: simpletest should skip disabled field on POST submissions.

From: Damien Tournoud <damien@tournoud.net>

According to [1], disabled controls cannot be successful (ie. 'valid for submission').

[1] http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.12
---
 node/node.test                      |    4 ++--
 simpletest/drupal_web_test_case.php |   11 ++++++++++-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git modules/node/node.test modules/node/node.test
index a4c7171..82645eb 100644
--- modules/node/node.test
+++ modules/node/node.test
@@ -350,7 +350,7 @@ class PageEditTestCase extends DrupalWebTestCase {
     // Check that the title and body fields are displayed with the correct values.
     $this->assertLink(t('Edit'), 0, t('Edit tab found.'));
     $this->assertFieldByName('title', $edit['title'], t('Title field displayed.'));
-    $this->assertFieldByName('body', '<!--break-->' . $edit['body'], t('Body field displayed.'));
+    $this->assertFieldByName('body', $edit['body'], t('Body field displayed.'));
 
     // Edit the content of the node.
     $edit = array();
@@ -398,7 +398,7 @@ class PagePreviewTestCase extends DrupalWebTestCase {
 
     // Check that the title and body fields are displayed with the correct values.
     $this->assertFieldByName('title', $edit['title'], t('Title field displayed.'));
-    $this->assertFieldByName('body', '<!--break-->' . $edit['body'], t('Body field displayed.'));
+    $this->assertFieldByName('body', $edit['body'], t('Body field displayed.'));
   }
 }
 
diff --git modules/simpletest/drupal_web_test_case.php modules/simpletest/drupal_web_test_case.php
index d817ef7..282ffd9 100644
--- modules/simpletest/drupal_web_test_case.php
+++ modules/simpletest/drupal_web_test_case.php
@@ -1237,6 +1237,15 @@ class DrupalWebTestCase {
     foreach ($elements as $element) {
       // SimpleXML objects need string casting all the time.
       $name = (string) $element['name'];
+
+      // Ignore disabled elements, as those cannot be 'successful' (ie. be part
+      // of form submissions), according to:
+      // http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.12
+      if (!empty($element['disabled'])) {
+        unset($edit[$name]);
+        continue;
+      }
+
       // This can either be the type of <input> or the name of the tag itself
       // for <select> or <textarea>.
       $type = isset($element['type']) ? (string)$element['type'] : $element->getName();
@@ -1257,7 +1266,7 @@ class DrupalWebTestCase {
             }
             break;
           case 'checkbox':
-            // To prevent checkbox from being checked.pass in a FALSE,
+            // To prevent checkbox from being checked, pass in a FALSE,
             // otherwise the checkbox will be set to its value regardless
             // of $edit.
             if ($edit[$name] === FALSE) {