Index: test/unit/issue_relation_test.rb
===================================================================
diff --git a/branches/2.5-stable/test/unit/issue_relation_test.rb b/branches/2.5-stable/test/unit/issue_relation_test.rb
--- a/branches/2.5-stable/test/unit/issue_relation_test.rb	(Revision 13182)
+++ b/branches/2.5-stable/test/unit/issue_relation_test.rb	(Arbeitskopie)
@@ -118,6 +118,40 @@
     assert_not_equal [], r.errors[:base]
   end
 
+  def test_validates_no_circular_dependency_for_relates
+    IssueRelation.delete_all
+    assert IssueRelation.create!(
+             :issue_from => Issue.find(1), :issue_to => Issue.find(2),
+             :relation_type => IssueRelation::TYPE_RELATES
+           )
+    assert IssueRelation.create!(
+             :issue_from => Issue.find(2), :issue_to => Issue.find(3),
+             :relation_type => IssueRelation::TYPE_RELATES
+           )
+    r = IssueRelation.new(
+          :issue_from => Issue.find(3), :issue_to => Issue.find(1),
+          :relation_type => IssueRelation::TYPE_RELATES
+        )
+    assert r.save
+  end
+
+  def test_validates_no_circular_dependency_for_relates_reverse_last
+    IssueRelation.delete_all
+    assert IssueRelation.create!(
+             :issue_from => Issue.find(1), :issue_to => Issue.find(2),
+             :relation_type => IssueRelation::TYPE_RELATES
+           )
+    assert IssueRelation.create!(
+             :issue_from => Issue.find(2), :issue_to => Issue.find(3),
+             :relation_type => IssueRelation::TYPE_RELATES
+           )
+    r = IssueRelation.new(
+          :issue_from => Issue.find(1), :issue_to => Issue.find(3),
+          :relation_type => IssueRelation::TYPE_RELATES
+        )
+    assert r.save
+  end
+
   def test_validates_circular_dependency_of_subtask
     set_language_if_valid 'en'
     issue1 = Issue.generate!