Skip all issue concurrency tests with MySQL.

git-svn-id: http://svn.redmine.org/redmine/trunk@16926 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/issue_nested_set_concurrency_test.rb

@@ -27,7 +27,7 @@ class IssueNestedSetConcurrencyTest < ActiveSupport::TestCase
   self.use_transactional_tests = false
 
   def setup
-    skip if sqlite?
+    skip if sqlite? || mysql?
     CustomField.delete_all
   end
 
@@ -36,8 +36,6 @@ class IssueNestedSetConcurrencyTest < ActiveSupport::TestCase
   end
 
   def test_concurrency
-    skip if mysql?
-
     # Generates an issue and destroys it in order
     # to load all needed classes before starting threads
     i = Issue.generate!