commit cecfb2117f15adc86290f29758b7722a91de1814
Author: Lee Rowlands <lee.rowlands@previousnext.com.au>
Date:   Mon Jan 28 14:03:11 2013 +1000

    Comment module cannot be disabled in tests that extend CommentTestBase, there are still existing fields created in the base class setup

diff --git a/core/modules/comment/lib/Drupal/comment/Tests/CommentFieldsTest.php b/core/modules/comment/lib/Drupal/comment/Tests/CommentFieldsTest.php
index 9a9b34d..a15a15a 100644
--- a/core/modules/comment/lib/Drupal/comment/Tests/CommentFieldsTest.php
+++ b/core/modules/comment/lib/Drupal/comment/Tests/CommentFieldsTest.php
@@ -68,25 +68,6 @@ function testCommentEnable() {
     $this->admin_user = $this->drupalCreateUser(array('access administration pages', 'administer modules'));
     $this->drupalLogin($this->admin_user);
 
-    // Disable the comment module.
-    $edit = array();
-    $edit['modules[Core][comment][enable]'] = FALSE;
-    $this->drupalPost('admin/modules', $edit, t('Save configuration'));
-    $this->rebuildContainer();
-    $this->assertFalse(module_exists('comment'), 'Comment module disabled.');
-
-    // Enable core content type module (book).
-    $edit = array();
-    $edit['modules[Core][book][enable]'] = 'book';
-    $this->drupalPost('admin/modules', $edit, t('Save configuration'));
-
-    // Now enable the comment module.
-    $edit = array();
-    $edit['modules[Core][comment][enable]'] = 'comment';
-    $this->drupalPost('admin/modules', $edit, t('Save configuration'));
-    $this->rebuildContainer();
-    $this->assertTrue(module_exists('comment'), 'Comment module enabled.');
-
     // Create nodes of each type.
     comment_add_default_comment_field('node', 'book');
     $book_node = $this->drupalCreateNode(array(