Adding /reasign_reviewer command

* Based more or less on the /reassign command for issues and MRs

doc/user/project/quick_actions.md

@@ -62,6 +62,7 @@ The following quick actions are applicable to descriptions, discussions and thre
 | `/publish`                            | ✓     |               |      | Publish issue to an associated [Status Page](../../operations/incident_management/status_page.md) ([Introduced in GitLab 13.0](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/30906)) **(ULTIMATE)** |
 | `/reassign @user1 @user2`             | ✓     | ✓             |      | Replace current assignees with those specified. **(STARTER)**                                                                                         |
 | `/rebase`                             |       | ✓             |      | Rebase source branch. This will schedule a background task that attempt to rebase the changes in the source branch on the latest commit of the target branch. If `/rebase` is used, `/merge` will be ignored to avoid a race condition where the source branch is merged or deleted before it is rebased. |
+| `/reassign_reviewer @user1 @user2`    |       | ✓             |      | Replace current reviewers with those specified. **(STARTER)**                                                                                         |
 | `/relabel ~label1 ~label2`            | ✓     | ✓             | ✓    | Replace current labels with those specified.                                                                        |
 | `/relate #issue1 #issue2`             | ✓     |               |      | Mark issues as related. **(STARTER)**                                                                                            |
 | `/remove_child_epic <epic>`           |       |               | ✓    | Remove child epic from `<epic>`. The `<epic>` value should be in the format of `&epic`, `group&epic`, or a URL to an epic ([introduced in GitLab 12.0](https://gitlab.com/gitlab-org/gitlab/-/issues/7330)). **(ULTIMATE)** |

ee/app/services/ee/quick_actions/interpret_service.rb

@@ -11,6 +11,7 @@ module EE
         include EE::Gitlab::QuickActions::EpicActions
         include EE::Gitlab::QuickActions::IssueActions
         include EE::Gitlab::QuickActions::IssueAndMergeRequestActions
+        include EE::Gitlab::QuickActions::MergeRequestActions
         # rubocop: enable Cop/InjectEnterpriseEditionModule
       end
     end

ee/changelogs/unreleased/241244-add-reviewers-quick-action-4.yml

+---
+title: Add `/reassign_reviewer` command
+merge_request: 47606
+author:
+type: added

ee/lib/ee/gitlab/quick_actions/merge_request_actions.rb

+# frozen_string_literal: true
+
+module EE
+  module Gitlab
+    module QuickActions
+      module MergeRequestActions
+        extend ActiveSupport::Concern
+        include ::Gitlab::QuickActions::Dsl
+
+        included do
+          desc _('Change reviewer(s)')
+          explanation _('Change reviewer(s).')
+          execution_message _('Changed reviewer(s).')
+          params '@user1 @user2'
+          types MergeRequest
+          condition do
+            quick_action_target.allows_multiple_reviewers? &&
+              ::Feature.enabled?(:merge_request_reviewers, project, default_enabled: :yaml) &&
+              quick_action_target.persisted? &&
+              current_user.can?(:"admin_#{quick_action_target.to_ability_name}", project)
+          end
+          command :reassign_reviewer do |reassign_param|
+            @updates[:reviewer_ids] = extract_users(reassign_param).map(&:id)
+          end
+        end
+      end
+    end
+  end
+end

ee/spec/services/ee/notes/create_service_spec.rb

@@ -4,11 +4,12 @@ require 'spec_helper'
 
 RSpec.describe Notes::CreateService do
   context 'note with commands' do
+    let(:project) { create(:project) }
+    let(:note_params) { opts }
+
     context 'for issues' do
-      let(:project) { create(:project) }
       let(:issuable) { create(:issue, project: project, weight: 10) }
       let(:opts) { { noteable_type: 'Issue', noteable_id: issuable.id } }
-      let(:note_params) { opts }
 
       it_behaves_like 'issuable quick actions' do
         let(:quick_actions) do
@@ -33,5 +34,30 @@ RSpec.describe Notes::CreateService do
         end
       end
     end
+
+    context 'for merge_requests' do
+      let(:issuable) { create(:merge_request, project: project, source_project: project) }
+      let(:developer) { create(:user) }
+      let(:user) { create(:user) }
+      let(:opts) { { noteable_type: 'MergeRequest', noteable_id: issuable.id } }
+
+      it_behaves_like 'issuable quick actions' do
+        let(:quick_actions) do
+          [
+            QuickAction.new(
+              before_action: -> {
+                project.add_developer(developer)
+                issuable.update!(reviewers: [user])
+              },
+
+              action_text: "/reassign_reviewer #{developer.to_reference}",
+              expectation: ->(issuable, can_use_quick_action) {
+                expect(issuable.reviewers == [developer]).to eq(can_use_quick_action)
+              }
+            )
+          ]
+        end
+      end
+    end
   end
 end

ee/spec/services/quick_actions/interpret_service_spec.rb

@@ -16,6 +16,7 @@ RSpec.describe QuickActions::InterpretService do
 
   before do
     stub_licensed_features(multiple_issue_assignees: true,
+                           multiple_merge_request_reviewers: true,
                            multiple_merge_request_assignees: true)
 
     project.add_developer(current_user)
@@ -272,6 +273,43 @@ RSpec.describe QuickActions::InterpretService do
       end
     end
 
+    context 'reassign_reviewer command' do
+      let(:content) { "/reassign_reviewer @#{current_user.username}" }
+
+      context "if the 'merge_request_reviewers' feature flag is on" do
+        context 'unlicensed' do
+          before do
+            stub_licensed_features(multiple_merge_request_reviewers: false)
+          end
+
+          it 'does not recognize /reassign_reviewer @user' do
+            content = "/reassign_reviewer @#{current_user.username}"
+            _, updates = service.execute(content, merge_request)
+
+            expect(updates).to be_empty
+          end
+        end
+
+        it 'reassigns reviewer if content contains /reassign_reviewer @user' do
+          _, updates = service.execute("/reassign_reviewer @#{current_user.username}", merge_request)
+
+          expect(updates[:reviewer_ids]).to match_array([current_user.id])
+        end
+      end
+
+      context "if the 'merge_request_reviewers' feature flag is off" do
+        before do
+          stub_feature_flags(merge_request_reviewers: false)
+        end
+
+        it 'does not recognize /reassign_reviewer @user' do
+          _, updates = service.execute(content, merge_request)
+
+          expect(updates).to be_empty
+        end
+      end
+    end
+
     context 'iteration command' do
       let_it_be(:iteration) { create(:iteration, group: group) }
 

locale/gitlab.pot

@@ -5212,6 +5212,12 @@ msgstr ""
 msgid "Change permissions"
 msgstr ""
 
+msgid "Change reviewer(s)"
+msgstr ""
+
+msgid "Change reviewer(s)."
+msgstr ""
+
 msgid "Change status"
 msgstr ""
 
@@ -5278,6 +5284,9 @@ msgstr ""
 msgid "Changed assignee(s)."
 msgstr ""
 
+msgid "Changed reviewer(s)."
+msgstr ""
+
 msgid "Changed the title to \"%{title_param}\"."
 msgstr ""