Use a better message when milestone is newly created

make some changes for the checks to determine when the messages should be displayed

add item to changelog and also integration test

make some changes to the test

make some changes

CHANGELOG

@@ -7,6 +7,7 @@ v 8.8.0 (unreleased)
   - Fix error when visiting commit builds page before build was updated
   - Add 'l' shortcut to open Label dropdown on issuables and 'i' to create new issue on a project
   - Updated search UI
+  - Display informative message when new milestone is created
   - Replace Devise Async with Devise ActiveJob integration. !3902 (Connor Shea)
   - Allow "NEWS" and "CHANGES" as alternative names for CHANGELOG. !3768 (Connor Shea)
   - Added button to toggle whitespaces changes on diff view

app/models/concerns/milestoneish.rb

@@ -8,7 +8,7 @@ module Milestoneish
   end
 
   def complete?(user = nil)
-    total_items_count(user) == closed_items_count(user)
+    total_items_count(user) > 0 && total_items_count(user) == closed_items_count(user)
   end
 
   def percent_complete(user = nil)

app/views/projects/milestones/show.html.haml

@@ -42,9 +42,12 @@
           = preserve do
             = markdown @milestone.description
 
-- if @milestone.complete?(current_user) && @milestone.active?
+- if @milestone.total_items_count(current_user).zero?
   .alert.alert-success.prepend-top-default
-    %span All issues for this milestone are closed. You may close milestone now.
+    %span Assign some issues to this milestone.
+- elsif @milestone.complete?(current_user) && @milestone.active?
+  .alert.alert-success.prepend-top-default
+    %span All issues for this milestone are closed. You may close this milestone now.
 
 = render 'shared/milestones/summary', milestone: @milestone, project: @project
 = render 'shared/milestones/tabs', milestone: @milestone

spec/features/milestone_spec.rb

+require 'rails_helper'
+
+feature 'Milestone', feature: true do
+  include WaitForAjax
+
+  let(:project) { create(:project, :public) }
+  let(:user)   { create(:user) }
+  let(:milestone) { create(:milestone, project: project, title: 8.7) }
+
+  before do
+    project.team << [user, :master]
+    login_as(user)
+  end
+
+  feature 'Create a milestone' do
+    scenario 'should show an informative message for a new issue' do
+      visit new_namespace_project_milestone_path(project.namespace, project)
+      page.within '.milestone-form' do
+        fill_in "milestone_title", with: '8.7'
+      end
+      find('input[name="commit"]').click
+
+      expect(find('.alert-success')).to have_content('Assign some issues to this milestone.')
+    end
+  end
+
+  feature 'Open a milestone with closed issues' do
+    scenario 'should show an informative message' do
+      create(:issue, title: "Bugfix1", project: project, milestone: milestone, state: "closed")
+      visit namespace_project_milestone_path(project.namespace, project, milestone)
+
+      expect(find('.alert-success')).to have_content('All issues for this milestone are closed. You may close this milestone now.')
+    end
+  end
+end