12521-v2.patch - Redmine

       def destroy
         @tracker = Tracker.find(params[:id])
         unless @tracker.issues.empty?
           flash[:error] = l(:error_can_not_delete_tracker)
           projects = Project.joins(:issues).where(issues: {tracker_id: @tracker.id}).sorted.distinct
           links = projects.map do |p|
             view_context.link_to(p, project_issues_path(p, set_filter: 1, tracker_id: @tracker.id))
           end.join(', ')
           flash[:error] = l(:error_can_not_delete_tracker_html, projects: links.html_safe)
         else
           @tracker.destroy
         end

       error_no_tracker_in_project: 'No tracker is associated to this project. Please check the Project settings.'
       error_no_default_issue_status: 'No default issue status is defined. Please check your configuration (Go to "Administration -> Issue statuses").'
       error_can_not_delete_custom_field: Unable to delete custom field
       error_can_not_delete_tracker: "This tracker contains issues and cannot be deleted."
       error_can_not_delete_tracker_html: "This tracker contains issues and cannot be deleted.<p>The following projects have issues with this tracker:<br>%{projects}</p>"
       error_can_not_remove_role: "This role is in use and cannot be deleted."
       error_can_not_reopen_issue_on_closed_version: 'An issue assigned to a closed version cannot be reopened'
       error_can_not_archive_project: This project cannot be archived

       end
       def test_destroy_tracker_in_use
         tracker = Tracker.generate!(name: 'In use')
         projects = Array.new(2) do
           project = Project.generate!
           Issue.generate!(project: project, tracker: tracker)
           project
         end
         assert_no_difference 'Tracker.count' do
           delete :destroy, :params => {:id => 1}
           delete :destroy, params: {id: tracker.id}
         end
         assert_redirected_to action: 'index'
         assert_match /The following projects have issues with this tracker:/, flash[:error]
         projects.each do |project|
           assert_match /#{project.name}/, flash[:error]
         end
         assert_redirected_to :action => 'index'
         assert_not_nil flash[:error]
       end
       def test_get_fields

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