Merge branch 'Add-a-shash-command-for-target-merge-request-branch' into 'master'

Adds /target_branch slash command functionality for merge requests

Closes #23619

See merge request !7216

2 files changed, 106 insertions, 0 deletions

diff --git a/spec/features/merge_requests/user_uses_slash_commands_spec.rb b/spec/features/merge_requests/user_uses_slash_commands_spec.rb
index 2582a540240..2b454b38231 100644
--- a/spec/features/merge_requests/user_uses_slash_commands_spec.rb
+++ b/spec/features/merge_requests/user_uses_slash_commands_spec.rb
@@ -120,5 +120,79 @@ feature 'Merge Requests > User uses slash commands', feature: true, js: true do
         expect(page).not_to have_content '/due 2016-08-28'
       end
     end
+
+    describe '/target_branch command in merge request' do
+      let(:another_project) { create(:project, :public) }
+      let(:new_url_opts) { { merge_request: { source_branch: 'feature' } } }
+
+      before do
+        logout
+        another_project.team << [user, :master]
+        login_with(user)
+      end
+
+      it 'changes target_branch in new merge_request' do
+        visit new_namespace_project_merge_request_path(another_project.namespace, another_project, new_url_opts)
+        fill_in "merge_request_title", with: 'My brand new feature'
+        fill_in "merge_request_description", with: "le feature \n/target_branch fix\nFeature description:"
+        click_button "Submit merge request"
+
+        merge_request = another_project.merge_requests.first
+        expect(merge_request.description).to eq "le feature \nFeature description:"
+        expect(merge_request.target_branch).to eq 'fix'
+      end
+
+      it 'does not change target branch when merge request is edited' do
+        new_merge_request = create(:merge_request, source_project: another_project)
+
+        visit edit_namespace_project_merge_request_path(another_project.namespace, another_project, new_merge_request)
+        fill_in "merge_request_description", with: "Want to update target branch\n/target_branch fix\n"
+        click_button "Save changes"
+
+        new_merge_request = another_project.merge_requests.first
+        expect(new_merge_request.description).to include('/target_branch')
+        expect(new_merge_request.target_branch).not_to eq('fix')
+      end
+    end
+
+    describe '/target_branch command from note' do
+      context 'when the current user can change target branch' do
+        it 'changes target branch from a note' do
+          write_note("message start \n/target_branch merge-test\n message end.")
+
+          expect(page).not_to have_content('/target_branch')
+          expect(page).to have_content('message start')
+          expect(page).to have_content('message end.')
+
+          expect(merge_request.reload.target_branch).to eq 'merge-test'
+        end
+
+        it 'does not fail when target branch does not exists' do
+          write_note('/target_branch totally_not_existing_branch')
+
+          expect(page).not_to have_content('/target_branch')
+
+          expect(merge_request.target_branch).to eq 'feature'
+        end
+      end
+
+      context 'when current user can not change target branch' do
+        let(:guest) { create(:user) }
+        before do
+          project.team << [guest, :guest]
+          logout
+          login_with(guest)
+          visit namespace_project_merge_request_path(project.namespace, project, merge_request)
+        end
+
+        it 'does not change target branch' do
+          write_note('/target_branch merge-test')
+
+          expect(page).not_to have_content '/target_branch merge-test'
+
+          expect(merge_request.target_branch).to eq 'feature'
+        end
+      end
+    end
   end
 end
diff --git a/spec/services/slash_commands/interpret_service_spec.rb b/spec/services/slash_commands/interpret_service_spec.rb
index 66fc8fc360b..0b0925983eb 100644
--- a/spec/services/slash_commands/interpret_service_spec.rb
+++ b/spec/services/slash_commands/interpret_service_spec.rb
@@ -653,5 +653,37 @@ describe SlashCommands::InterpretService, services: true do
         let(:issuable) { issue }
       end
     end
+
+    context '/target_branch command' do
+      let(:non_empty_project) { create(:project) }
+      let(:another_merge_request) { create(:merge_request, author: developer, source_project: non_empty_project) }
+      let(:service) { described_class.new(non_empty_project, developer)}
+
+      it 'updates target_branch if /target_branch command is executed' do
+        _, updates = service.execute('/target_branch merge-test', merge_request)
+
+        expect(updates).to eq(target_branch: 'merge-test')
+      end
+
+      it 'handles blanks around param' do
+        _, updates = service.execute('/target_branch  merge-test     ', merge_request)
+
+        expect(updates).to eq(target_branch: 'merge-test')
+      end
+
+      context 'ignores command with no argument' do
+        it_behaves_like 'empty command' do
+          let(:content) { '/target_branch' }
+          let(:issuable) { another_merge_request }
+        end
+      end
+
+      context 'ignores non-existing target branch' do
+        it_behaves_like 'empty command' do
+          let(:content) { '/target_branch totally_non_existing_branch' }
+          let(:issuable) { another_merge_request }
+        end
+      end
+    end
   end
 end