1 files changed, 73 insertions, 0 deletions
diff --git a/spec/support/shared_examples/issuable_shared_examples.rb b/spec/support/shared_examples/issuable_shared_examples.rb
index 42f3b4db23c..c3d40c5b231 100644
--- a/spec/support/shared_examples/issuable_shared_examples.rb
+++ b/spec/support/shared_examples/issuable_shared_examples.rb
@@ -36,3 +36,76 @@ shared_examples 'system notes for milestones' do
     end
   end
 end
+
+shared_examples 'updating a single task' do
+  def update_issuable(opts)
+    issuable = try(:issue) || try(:merge_request)
+    described_class.new(project, user, opts).execute(issuable)
+  end
+
+  before do
+    update_issuable(description: "- [ ] Task 1\n- [ ] Task 2")
+  end
+
+  context 'when a task is marked as completed' do
+    before do
+      update_issuable(update_task: { index: 1, checked: true, line_source: '- [ ] Task 1', line_number: 1 })
+    end
+
+    it 'creates system note about task status change' do
+      note1 = find_note('marked the task **Task 1** as completed')
+
+      expect(note1).not_to be_nil
+
+      description_notes = find_notes('description')
+      expect(description_notes.length).to eq(1)
+    end
+  end
+
+  context 'when a task is marked as incomplete' do
+    before do
+      update_issuable(description: "- [x] Task 1\n- [X] Task 2")
+      update_issuable(update_task: { index: 2, checked: false, line_source: '- [X] Task 2', line_number: 2 })
+    end
+
+    it 'creates system note about task status change' do
+      note1 = find_note('marked the task **Task 2** as incomplete')
+
+      expect(note1).not_to be_nil
+
+      description_notes = find_notes('description')
+      expect(description_notes.length).to eq(1)
+    end
+  end
+
+  context 'when the task position has been modified' do
+    before do
+      update_issuable(description: "- [ ] Task 1\n- [ ] Task 3\n- [ ] Task 2")
+    end
+
+    it 'raises an exception' do
+      expect(Note.count).to eq(2)
+      expect do
+        update_issuable(update_task: { index: 2, checked: true, line_source: '- [ ] Task 2', line_number: 2 })
+      end.to raise_error(ActiveRecord::StaleObjectError)
+      expect(Note.count).to eq(2)
+    end
+  end
+
+  context 'when the content changes but not task line number' do
+    before do
+      update_issuable(description: "Paragraph\n\n- [ ] Task 1\n- [x] Task 2")
+      update_issuable(description: "Paragraph with more words\n\n- [ ] Task 1\n- [x] Task 2")
+      update_issuable(update_task: { index: 2, checked: false, line_source: '- [x] Task 2', line_number: 4 })
+    end
+
+    it 'creates system note about task status change' do
+      note1 = find_note('marked the task **Task 2** as incomplete')
+
+      expect(note1).not_to be_nil
+
+      description_notes = find_notes('description')
+      expect(description_notes.length).to eq(2)
+    end
+  end
+end