Merge branch 'archytaus/gitlab-ce-26372-duplicate-issue-slash-command' into 'master'

New `/duplicate` quick action

Closes #26372

See merge request !12845

5 files changed, 237 insertions, 0 deletions

diff --git a/spec/features/issues/user_uses_slash_commands_spec.rb b/spec/features/issues/user_uses_slash_commands_spec.rb
index 4740402dc01..0c3c27e3e45 100644
--- a/spec/features/issues/user_uses_slash_commands_spec.rb
+++ b/spec/features/issues/user_uses_slash_commands_spec.rb
@@ -118,5 +118,42 @@ feature 'Issues > User uses quick actions', feature: true, js: true do
         expect(page).not_to have_content '/wip'
       end
     end
+
+    describe 'mark issue as duplicate' do
+      let(:issue) { create(:issue, project: project) }
+      let(:original_issue) { create(:issue, project: project) }
+
+      context 'when the current user can update issues' do
+        it 'does not create a note, and marks the issue as a duplicate' do
+          write_note("/duplicate ##{original_issue.to_reference}")
+
+          expect(page).not_to have_content "/duplicate #{original_issue.to_reference}"
+          expect(page).to have_content 'Commands applied'
+          expect(page).to have_content "marked this issue as a duplicate of #{original_issue.to_reference}"
+
+          expect(issue.reload).to be_closed
+        end
+      end
+
+      context 'when the current user cannot update the issue' do
+        let(:guest) { create(:user) }
+        before do
+          project.team << [guest, :guest]
+          gitlab_sign_out
+          sign_in(guest)
+          visit project_issue_path(project, issue)
+        end
+
+        it 'does not create a note, and does not mark the issue as a duplicate' do
+          write_note("/duplicate ##{original_issue.to_reference}")
+
+          expect(page).to have_content "/duplicate ##{original_issue.to_reference}"
+          expect(page).not_to have_content 'Commands applied'
+          expect(page).not_to have_content "marked this issue as a duplicate of #{original_issue.to_reference}"
+
+          expect(issue.reload).to be_open
+        end
+      end
+    end
   end
 end
diff --git a/spec/services/issues/duplicate_service_spec.rb b/spec/services/issues/duplicate_service_spec.rb
new file mode 100644
index 00000000000..82daf53b173
--- /dev/null
+++ b/spec/services/issues/duplicate_service_spec.rb
@@ -0,0 +1,80 @@
+require 'spec_helper'
+
+describe Issues::DuplicateService, services: true do
+  let(:user) { create(:user) }
+  let(:canonical_project) { create(:empty_project) }
+  let(:duplicate_project) { create(:empty_project) }
+
+  let(:canonical_issue) { create(:issue, project: canonical_project) }
+  let(:duplicate_issue) { create(:issue, project: duplicate_project) }
+
+  subject { described_class.new(duplicate_project, user, {}) }
+
+  describe '#execute' do
+    context 'when the issues passed are the same' do
+      it 'does nothing' do
+        expect(subject).not_to receive(:close_service)
+        expect(SystemNoteService).not_to receive(:mark_duplicate_issue)
+        expect(SystemNoteService).not_to receive(:mark_canonical_issue_of_duplicate)
+
+        subject.execute(duplicate_issue, duplicate_issue)
+      end
+    end
+
+    context 'when the user cannot update the duplicate issue' do
+      before do
+        canonical_project.add_reporter(user)
+      end
+
+      it 'does nothing' do
+        expect(subject).not_to receive(:close_service)
+        expect(SystemNoteService).not_to receive(:mark_duplicate_issue)
+        expect(SystemNoteService).not_to receive(:mark_canonical_issue_of_duplicate)
+
+        subject.execute(duplicate_issue, canonical_issue)
+      end
+    end
+
+    context 'when the user cannot comment on the canonical issue' do
+      before do
+        duplicate_project.add_reporter(user)
+      end
+
+      it 'does nothing' do
+        expect(subject).not_to receive(:close_service)
+        expect(SystemNoteService).not_to receive(:mark_duplicate_issue)
+        expect(SystemNoteService).not_to receive(:mark_canonical_issue_of_duplicate)
+
+        subject.execute(duplicate_issue, canonical_issue)
+      end
+    end
+
+    context 'when the user can mark the issue as a duplicate' do
+      before do
+        canonical_project.add_reporter(user)
+        duplicate_project.add_reporter(user)
+      end
+
+      it 'closes the duplicate issue' do
+        subject.execute(duplicate_issue, canonical_issue)
+
+        expect(duplicate_issue.reload).to be_closed
+        expect(canonical_issue.reload).to be_open
+      end
+
+      it 'adds a system note to the duplicate issue' do
+        expect(SystemNoteService)
+          .to receive(:mark_duplicate_issue).with(duplicate_issue, duplicate_project, user, canonical_issue)
+
+        subject.execute(duplicate_issue, canonical_issue)
+      end
+
+      it 'adds a system note to the canonical issue' do
+        expect(SystemNoteService)
+          .to receive(:mark_canonical_issue_of_duplicate).with(canonical_issue, canonical_project, user, duplicate_issue)
+
+        subject.execute(duplicate_issue, canonical_issue)
+      end
+    end
+  end
+end
diff --git a/spec/services/issues/update_service_spec.rb b/spec/services/issues/update_service_spec.rb
index d0b991f19ab..064be940a1c 100644
--- a/spec/services/issues/update_service_spec.rb
+++ b/spec/services/issues/update_service_spec.rb
@@ -491,6 +491,27 @@ describe Issues::UpdateService, services: true do
       include_examples 'updating mentions', Issues::UpdateService
     end
 
+    context 'duplicate issue' do
+      let(:canonical_issue) { create(:issue, project: project) }
+
+      context 'invalid canonical_issue_id' do
+        it 'does not call the duplicate service' do
+          expect(Issues::DuplicateService).not_to receive(:new)
+
+          update_issue(canonical_issue_id: 123456789)
+        end
+      end
+
+      context 'valid canonical_issue_id' do
+        it 'calls the duplicate service with both issues' do
+          expect_any_instance_of(Issues::DuplicateService)
+            .to receive(:execute).with(issue, canonical_issue)
+
+          update_issue(canonical_issue_id: canonical_issue.id)
+        end
+      end
+    end
+
     include_examples 'issuable update service' do
       let(:open_issuable) { issue }
       let(:closed_issuable) { create(:closed_issue, project: project) }
diff --git a/spec/services/quick_actions/interpret_service_spec.rb b/spec/services/quick_actions/interpret_service_spec.rb
index a2db3f68ff7..2a2a5c38e4b 100644
--- a/spec/services/quick_actions/interpret_service_spec.rb
+++ b/spec/services/quick_actions/interpret_service_spec.rb
@@ -261,6 +261,15 @@ describe QuickActions::InterpretService, services: true do
       end
     end
 
+    shared_examples 'duplicate command' do
+      it 'fetches issue and populates canonical_issue_id if content contains /duplicate issue_reference' do
+        issue_duplicate # populate the issue
+        _, updates = service.execute(content, issuable)
+
+        expect(updates).to eq(canonical_issue_id: issue_duplicate.id)
+      end
+    end
+
     it_behaves_like 'reopen command' do
       let(:content) { '/reopen' }
       let(:issuable) { issue }
@@ -644,6 +653,41 @@ describe QuickActions::InterpretService, services: true do
       let(:issuable) { issue }
     end
 
+    context '/duplicate command' do
+      it_behaves_like 'duplicate command' do
+        let(:issue_duplicate) { create(:issue, project: project) }
+        let(:content) { "/duplicate #{issue_duplicate.to_reference}" }
+        let(:issuable) { issue }
+      end
+
+      it_behaves_like 'empty command' do
+        let(:content) { '/duplicate' }
+        let(:issuable) { issue }
+      end
+
+      context 'cross project references' do
+        it_behaves_like 'duplicate command' do
+          let(:other_project) { create(:empty_project, :public) }
+          let(:issue_duplicate) { create(:issue, project: other_project) }
+          let(:content) { "/duplicate #{issue_duplicate.to_reference(project)}" }
+          let(:issuable) { issue }
+        end
+
+        it_behaves_like 'empty command' do
+          let(:content) { "/duplicate imaginary#1234" }
+          let(:issuable) { issue }
+        end
+
+        it_behaves_like 'empty command' do
+          let(:other_project) { create(:empty_project, :private) }
+          let(:issue_duplicate) { create(:issue, project: other_project) }
+
+          let(:content) { "/duplicate #{issue_duplicate.to_reference(project)}" }
+          let(:issuable) { issue }
+        end
+      end
+    end
+
     context 'when current_user cannot :admin_issue' do
       let(:visitor) { create(:user) }
       let(:issue) { create(:issue, project: project, author: visitor) }
@@ -693,6 +737,11 @@ describe QuickActions::InterpretService, services: true do
         let(:content) { '/remove_due_date' }
         let(:issuable) { issue }
       end
+
+      it_behaves_like 'empty command' do
+        let(:content) { '/duplicate #{issue.to_reference}' }
+        let(:issuable) { issue }
+      end
     end
 
     context '/award command' do
diff --git a/spec/services/system_note_service_spec.rb b/spec/services/system_note_service_spec.rb
index 60477b8e9ba..681b419aedf 100644
--- a/spec/services/system_note_service_spec.rb
+++ b/spec/services/system_note_service_spec.rb
@@ -1101,4 +1101,54 @@ describe SystemNoteService, services: true do
       expect(subject.note).to include(diffs_project_merge_request_url(project, merge_request, diff_id: diff_id, anchor: line_code))
     end
   end
+
+  describe '.mark_duplicate_issue' do
+    subject { described_class.mark_duplicate_issue(noteable, project, author, canonical_issue) }
+
+    context 'within the same project' do
+      let(:canonical_issue) { create(:issue, project: project) }
+
+      it_behaves_like 'a system note' do
+        let(:action) { 'duplicate' }
+      end
+
+      it { expect(subject.note).to eq "marked this issue as a duplicate of #{canonical_issue.to_reference}" }
+    end
+
+    context 'across different projects' do
+      let(:other_project)  { create(:empty_project) }
+      let(:canonical_issue) { create(:issue, project: other_project) }
+
+      it_behaves_like 'a system note' do
+        let(:action) { 'duplicate' }
+      end
+
+      it { expect(subject.note).to eq "marked this issue as a duplicate of #{canonical_issue.to_reference(project)}" }
+    end
+  end
+
+  describe '.mark_canonical_issue_of_duplicate' do
+    subject { described_class.mark_canonical_issue_of_duplicate(noteable, project, author, duplicate_issue) }
+
+    context 'within the same project' do
+      let(:duplicate_issue) { create(:issue, project: project) }
+
+      it_behaves_like 'a system note' do
+        let(:action) { 'duplicate' }
+      end
+
+      it { expect(subject.note).to eq "marked #{duplicate_issue.to_reference} as a duplicate of this issue" }
+    end
+
+    context 'across different projects' do
+      let(:other_project)  { create(:empty_project) }
+      let(:duplicate_issue) { create(:issue, project: other_project) }
+
+      it_behaves_like 'a system note' do
+        let(:action) { 'duplicate' }
+      end
+
+      it { expect(subject.note).to eq "marked #{duplicate_issue.to_reference(project)} as a duplicate of this issue" }
+    end
+  end
 end