Merge branch 'shorten-task-status-phrase' into 'master'

Shorten task status phrase

## What does this MR do?
Shortens the task status phrase to make it easier to read

## Are there points in the code the reviewer needs to double check?
Shouldn't be any

## Why was this MR needed?
Improve readability/scan-ability of the issues table

## Screenshots (if relevant)
Before:
![Screen_Shot_2016-08-27_at_12.38.17_PM](/uploads/12d54e4ce24dea203e8f7189b32e3a43/Screen_Shot_2016-08-27_at_12.38.17_PM.png)

After:
![Screen_Shot_2016-08-27_at_12.38.05_PM](/uploads/7dfcc3284025b889f6afa09ca273d928/Screen_Shot_2016-08-27_at_12.38.05_PM.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- Tests
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?
Closes #21543

See merge request !6062

CHANGELOG

@@ -10,6 +10,7 @@ v 8.12.0 (unreleased)
   - Reduce contributions calendar data payload (ClemMakesApps)
   - Add `web_url` field to issue, merge request, and snippet API objects (Ben Boeckel)
   - Set path for all JavaScript cookies to honor GitLab's subdirectory setting !5627 (Mike Greiling)
+  - Shorten task status phrase (ClemMakesApps)
   - Add hover color to emoji icon (ClemMakesApps)
   - Fix branches page dropdown sort alignment (ClemMakesApps)
   - Add white background for no readme container (ClemMakesApps)

app/models/concerns/taskable.rb

@@ -52,11 +52,11 @@ module Taskable
   end
 
   # Return a string that describes the current state of this Taskable's task
-  # list items, e.g. "20 tasks (12 completed, 8 remaining)"
+  # list items, e.g. "12 of 20 tasks completed"
   def task_status
     return '' if description.blank?
 
     sum = tasks.summary
-    "#{sum.item_count} tasks (#{sum.complete_count} completed, #{sum.incomplete_count} remaining)"
+    "#{sum.complete_count} of #{sum.item_count} #{'task'.pluralize(sum.item_count)} completed"
   end
 end

spec/support/taskable_shared_examples.rb

@@ -3,30 +3,57 @@
 # Requires a context containing:
 #   subject { Issue or MergeRequest }
 shared_examples 'a Taskable' do
-  before do
-    subject.description = <<-EOT.strip_heredoc
-      * [ ] Task 1
-      * [x] Task 2
-      * [x] Task 3
-      * [ ] Task 4
-      * [ ] Task 5
-    EOT
+  describe 'with multiple tasks' do
+    before do
+      subject.description = <<-EOT.strip_heredoc
+        * [ ] Task 1
+        * [x] Task 2
+        * [x] Task 3
+        * [ ] Task 4
+        * [ ] Task 5
+      EOT
+    end
+
+    it 'returns the correct task status' do
+      expect(subject.task_status).to match('2 of')
+      expect(subject.task_status).to match('5 tasks completed')
+    end
+
+    describe '#tasks?' do
+      it 'returns true when object has tasks' do
+        expect(subject.tasks?).to eq true
+      end
+
+      it 'returns false when object has no tasks' do
+        subject.description = 'Now I have no tasks'
+        expect(subject.tasks?).to eq false
+      end
+    end
   end
 
-  it 'returns the correct task status' do
-    expect(subject.task_status).to match('5 tasks')
-    expect(subject.task_status).to match('2 completed')
-    expect(subject.task_status).to match('3 remaining')
+  describe 'with an incomplete task' do
+    before do
+      subject.description = <<-EOT.strip_heredoc
+        * [ ] Task 1
+      EOT
+    end
+
+    it 'returns the correct task status' do
+      expect(subject.task_status).to match('0 of')
+      expect(subject.task_status).to match('1 task completed')
+    end
   end
 
-  describe '#tasks?' do
-    it 'returns true when object has tasks' do
-      expect(subject.tasks?).to eq true
+  describe 'with a complete task' do
+    before do
+      subject.description = <<-EOT.strip_heredoc
+        * [x] Task 1
+      EOT
     end
 
-    it 'returns false when object has no tasks' do
-      subject.description = 'Now I have no tasks'
-      expect(subject.tasks?).to eq false
+    it 'returns the correct task status' do
+      expect(subject.task_status).to match('1 of')
+      expect(subject.task_status).to match('1 task completed')
     end
   end
 end