Merge branch...

Merge branch '33999-test-when-the-projectcicdsetting-merge_pipelines_enabled-goes-from-false-to-true' into 'master'

Test when the `ProjectCiCdSetting#merge_pipelines_enabled` goes from `false` to `true`

Closes #33999

See merge request gitlab-org/gitlab!18645

ee/spec/models/project_ci_cd_setting_spec.rb

@@ -72,6 +72,10 @@ describe ProjectCiCdSetting do
 
     before do
       stub_licensed_features(merge_pipelines: true, merge_trains: true)
+    end
+
+    context 'when merge pipelines option was enabled' do
+      before do
         project.update(merge_pipelines_enabled: true)
       end
 
@@ -87,4 +91,23 @@ describe ProjectCiCdSetting do
         it { is_expected.to be false }
       end
     end
+
+    context 'when merge pipelines option was disabled' do
+      before do
+        project.update(merge_pipelines_enabled: false)
+      end
+
+      context 'when merge pipelines option is disabled' do
+        before do
+          project.update(merge_pipelines_enabled: true)
+        end
+
+        it { is_expected.to be false }
+      end
+
+      context 'when merge pipelines option is intact' do
+        it { is_expected.to be false }
+      end
+    end
+  end
 end