Simplify test and add wait and retry logics

qa/qa/ee/page/merge_request/show.rb

@@ -225,9 +225,12 @@ module QA
           end
 
           def merge_via_merge_train
+            # Revisit after merge page re-architect is done https://gitlab.com/gitlab-org/gitlab/-/issues/300042
+            # To remove page refresh logic if possible
             wait_until_ready_to_merge
+            wait_until { !find_element(:merge_button).has_text?("when pipeline succeeds") }
 
-            click_element(:merge_button, text: "Start merge train")
+            click_element(:merge_button)
 
             finished_loading?
           end

qa/qa/page/merge_request/show.rb

@@ -224,8 +224,7 @@ module QA
         end
 
         def merge!
-          wait_until_ready_to_merge
-          click_element(:merge_button)
+          try_to_merge!
           finished_loading?
 
           raise "Merge did not appear to be successful" unless merged?
@@ -237,7 +236,11 @@ module QA
         end
 
         def merged?
-          has_element?(:merged_status_content, text: 'The changes were merged into', wait: 60)
+          # Revisit after merge page re-architect is done https://gitlab.com/gitlab-org/gitlab/-/issues/300042
+          # To remove page refresh logic if possible
+          retry_until(max_attempts: 3, reload: true) do
+            has_element?(:merged_status_content, text: 'The changes were merged into', wait: 20)
+          end
         end
 
         # Check if the MR is able to be merged
@@ -280,7 +283,10 @@ module QA
         end
 
         def try_to_merge!
+          # Revisit after merge page re-architect is done https://gitlab.com/gitlab-org/gitlab/-/issues/300042
+          # To remove page refresh logic if possible
           wait_until_ready_to_merge
+          wait_until { !find_element(:merge_button).has_text?("when pipeline succeeds") }
 
           click_element(:merge_button)
         end

qa/qa/specs/features/ee/browser_ui/4_verify/pipelines_for_merged_results_and_merge_trains_spec.rb

 # frozen_string_literal: true
 
-require 'securerandom'
+require 'faker'
 
 module QA
   RSpec.describe 'Verify', :runner do
     describe 'Pipelines for merged results and merge trains' do
-      let(:group) { Resource::Group.fabricate_via_api! }
+      let(:executor) { "qa-runner-#{Faker::Alphanumeric.alphanumeric(8)}" }
 
       let!(:runner) do
         Resource::Runner.fabricate_via_api! do |runner|
-          runner.token = group.reload!.runners_token
-          runner.name = group.name
-          runner.tags = [group.name]
           runner.project = project
+          runner.name = executor
+          runner.tags = [executor]
         end
       end
 
       let(:project) do
         Resource::Project.fabricate_via_api! do |project|
-          project.name = 'pipelines-for-merged-results-and-merge-trains'
-          project.group = group
+          project.name = 'pipelines-for-merge-trains'
         end
       end
 
-      before do
+      let!(:ci_file) do
         Resource::Repository::Commit.fabricate_via_api! do |commit|
           commit.project = project
           commit.commit_message = 'Add .gitlab-ci.yml'
@@ -31,29 +29,33 @@ module QA
             [
               {
                 file_path: '.gitlab-ci.yml',
-                content: <<~EOF
+                content: <<~YAML
                   test:
-                    tags: [#{group.name}]
+                    tags: [#{executor}]
                     script: echo 'OK'
                     only:
                     - merge_requests
-                EOF
+                YAML
               }
             ]
           )
         end
+      end
 
-        Flow::Login.sign_in
-        project.visit!
-
-        Page::Project::Menu.perform(&:go_to_general_settings)
-        Page::Project::Settings::Main.perform do |main|
-          main.expand_merge_requests_settings do |settings|
-            settings.click_pipelines_for_merged_results_checkbox
-            settings.click_merge_trains_checkbox
-            settings.click_save_changes
+      let(:merge_request) do
+        Resource::MergeRequest.fabricate_via_api! do |merge_request|
+          merge_request.project = project
+          merge_request.description = Faker::Lorem.sentence
+          merge_request.target_new_branch = false
+          merge_request.file_name = Faker::Lorem.word
+          merge_request.file_content = Faker::Lorem.sentence
         end
       end
+
+      before do
+        Flow::Login.sign_in
+        project.visit!
+        Flow::MergeRequest.enable_merge_trains
       end
 
       after do
@@ -61,77 +63,28 @@ module QA
       end
 
       it 'creates a pipeline with merged results', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/562' do
-        branch_name = "merged-results-#{SecureRandom.hex(8)}"
-
-        # Create a branch that will be merged into the default branch
-        Resource::Repository::ProjectPush.fabricate! do |project_push|
-          project_push.project = project
-          project_push.new_branch = true
-          project_push.branch_name = branch_name
-          project_push.file_name = "file-#{SecureRandom.hex(8)}.txt"
-        end
-
-        # Create a merge request to merge the branch we just created
-        Resource::MergeRequest.fabricate_via_api! do |merge_request|
-          merge_request.project = project
-          merge_request.source_branch = branch_name
-          merge_request.no_preparation = true
-        end.visit!
+        merge_request.visit!
 
         Page::MergeRequest::Show.perform do |show|
-          pipeline_passed = Support::Retrier.retry_until(max_attempts: 5, sleep_interval: 5) do
-            show.has_pipeline_status?(/Merged result pipeline #\d+ passed/)
-          end
-
-          expect(pipeline_passed).to be_truthy, "Expected the merged result pipeline to pass."
+          expect(show).to have_pipeline_status('passed'), 'Expected the merge request pipeline to pass.'
 
           # The default option is to merge via merge train,
           # but that is covered by the 'merges via a merge train' test
           show.skip_merge_train_and_merge_immediately
-        end
 
-        merged = Page::MergeRequest::Show.perform(&:merged?)
-
-        expect(merged).to be_truthy, "Expected content 'The changes were merged' but it did not appear."
+          expect(show).to be_merged, "Expected content 'The changes were merged' but it did not appear."
         end
-
-      it 'merges via a merge train', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/561' do
-        branch_name = "merge-train-#{SecureRandom.hex(8)}"
-
-        # Create a branch that will be merged into the default branch
-        Resource::Repository::ProjectPush.fabricate! do |project_push|
-          project_push.project = project
-          project_push.new_branch = true
-          project_push.branch_name = branch_name
-          project_push.file_name = "file-#{SecureRandom.hex(8)}.txt"
-          project_push.file_content = "merge me"
       end
 
-        # Create a merge request to merge the branch we just created
-        Resource::MergeRequest.fabricate_via_api! do |merge_request|
-          merge_request.project = project
-          merge_request.source_branch = branch_name
-          merge_request.no_preparation = true
-        end.visit!
+      it 'merges via a merge train', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/561' do
+        merge_request.visit!
 
         Page::MergeRequest::Show.perform do |show|
-          pipeline_passed = show.retry_until(max_attempts: 5, sleep_interval: 5) do
-            show.has_pipeline_status?(/Merged result pipeline #\d+ passed/)
-          end
-
-          expect(pipeline_passed).to be_truthy, "Expected the merged result pipeline to pass."
+          expect(show).to have_pipeline_status('passed'), 'Expected the merge request pipeline to pass.'
 
           show.merge_via_merge_train
 
-          # It's faster to refresh the page than to wait for the UI to
-          # automatically refresh, so we reload if the merge status
-          # doesn't update quickly.
-          merged = show.retry_until(max_attempts: 5, reload: true, sleep_interval: 5) do
-            show.merged?
-          end
-
-          expect(merged).to be_truthy, "Expected content 'The changes were merged' but it did not appear."
-          expect(show).to have_pipeline_status(/Merge train pipeline #\d+ passed/)
+          expect(show).to be_merged, "Expected content 'The changes were merged' but it did not appear."
         end
       end
     end