Test fails with mysql 5.7.

git-svn-id: http://svn.redmine.org/redmine/trunk@16874 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/issue_nested_set_concurrency_test.rb

@@ -36,6 +36,8 @@ 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!