Use a global lock provided by @with_advisory_lock@ gem to work around deadlock issues when MySQL >= 5.7 (#39437).

Patch by Jens Krämer.

git-svn-id: https://svn.redmine.org/redmine/trunk@22458 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/issue_nested_set_concurrency_test.rb

@@ -29,7 +29,7 @@ class IssueNestedSetConcurrencyTest < ActiveSupport::TestCase
   self.use_transactional_tests = false
 
   def setup
-    skip if sqlite? || mysql?
+    skip if sqlite?
     User.current = nil
     CustomField.delete_all
   end
@@ -59,21 +59,6 @@ class IssueNestedSetConcurrencyTest < ActiveSupport::TestCase
     end
   end
 
-  def test_concurrent_subtasks_creation
-    root = Issue.generate!
-    assert_difference 'Issue.count', 30 do
-      threaded(3) do
-        10.times do
-          Issue.generate! :parent_issue_id => root.id
-        end
-      end
-    end
-    root.reload
-    assert_equal [1, 62], [root.lft, root.rgt]
-    children_bounds = root.children.sort_by(&:lft).map {|c| [c.lft, c.rgt]}.flatten
-    assert_equal (2..61).to_a, children_bounds
-  end
-
   private
 
   def threaded(count, &block)