Index: issue_test.rb
===================================================================
--- issue_test.rb	(revision 16557)
+++ issue_test.rb	(working copy)
@@ -2309,6 +2309,15 @@
     assert_kind_of User, Issue.find(1).assignable_users.first
   end
 
+  test "#assignable_users should be sorted" do
+    %w(a č u ř c í ý š З д ч и).each do |firstname|
+      Member.create!(:project_id => 1, :principal => User.generate!(:firstname => firstname), :role_ids => [1])
+    end
+    issue = Issue.new(:project => Project.find(1))
+    assignable_users = Issue.find(1).assignable_users
+    assert_equal User.where(:id => assignable_users).sorted.pluck(:firstname), assignable_users.map(&:firstname)
+  end
+
   test "#assignable_users should include the issue author" do
     non_project_member = User.generate!
     issue = Issue.generate!(:author => non_project_member)