Adding a test that reverts a commit

This test reverts an existing commit on master
and creates a merge request based on the reverted
changes.

app/assets/javascripts/projects/commit/components/commit_options_dropdown.vue

@@ -65,6 +65,7 @@ export default {
     <gl-dropdown-item
       v-if="canRevert"
       data-testid="revert-link"
+      data-qa-selector="revert_button"
       @click="showModal($options.openRevertModal)"
     >
       {{ s__('ChangeTypeAction|Revert') }}

qa/qa/page/project/commit/show.rb

@@ -11,11 +11,18 @@ module QA
 
           view 'app/assets/javascripts/projects/commit/components/commit_options_dropdown.vue' do
             element :options_button
+            element :revert_button
             element :cherry_pick_button
             element :email_patches
             element :plain_diff
           end
 
+          def revert_commit
+            click_element(:options_button)
+            click_element(:revert_button, Page::Component::CommitModal)
+            click_element(:submit_commit_button)
+          end
+
           def cherry_pick_commit
             click_element(:options_button)
             click_element(:cherry_pick_button, Page::Component::CommitModal)

qa/qa/specs/features/browser_ui/3_create/merge_request/revert/revert_commit_spec.rb

+# frozen_string_literal: true
+
+module QA
+  RSpec.describe 'Create' do
+    describe 'Reverting a commit' do
+      let(:file_name) { "secret_file.md" }
+
+      let(:project) do
+        Resource::Project.fabricate_via_api! do |project|
+          project.name = 'project'
+          project.initialize_with_readme = true
+        end
+      end
+
+      let(:commit) do
+        Resource::Repository::Commit.fabricate_via_api! do |commit|
+          commit.project = project
+          commit.commit_message = 'Add new file'
+          commit.add_files([
+            { file_path: file_name, content: 'pssst!' }
+          ])
+        end
+      end
+
+      before do
+        Flow::Login.sign_in
+        commit.visit!
+      end
+
+      it 'creates a merge request', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1784' do
+        Page::Project::Commit::Show.perform(&:revert_commit)
+        Page::MergeRequest::New.perform(&:create_merge_request)
+
+        Page::MergeRequest::Show.perform do |merge_request|
+          merge_request.click_diffs_tab
+          expect(merge_request).to have_file(file_name)
+        end
+      end
+
+      after do
+        project.remove_via_api!
+      end
+    end
+  end
+end