Fix flaky test: Merge request > User merges only if pipeline succeeds when CI passes

Summary

This MR fixes a flaky test that was timing out when checking if a merge request gets merged after a pipeline succeeds.

Test Details:

• File: spec/features/merge_request/user_merges_only_if_pipeline_succeeds_spec.rb:241
• Description: Merge request > User merges only if pipeline succeeds when project has CI enabled when merge requests can be merged when the build failed when CI is running when auto-merge is set when CI passes the MR gets merged
• Issue: https://gitlab.com/gitlab-org/quality/test-failure-issues/-/issues/2299
• Flakiness severity: flakiness::3

Root Cause

The test was failing intermittently (~3-5% of runs) due to a race condition:

1. The test sets pipeline.set_status('success') which updates the database
2. The test immediately asserts expect(page).to have_content("Pipeline ##{pipeline.id} passed")
3. The frontend needs to poll/receive updates to reflect the new status
4. Race condition: Sometimes the frontend doesn't update within the 30-second Capybara timeout

Expected output: "Pipeline #25 passed" Actual output (when failing): "Pipeline #25 running" (timeout after 30s)

The Fix

Added wait_for_requests before the first assertion to ensure any pending frontend updates (GraphQL queries, polling) complete before checking the page content.

it 'the MR gets merged' do
  wait_for_requests  # NEW: Wait for frontend to update

  expect(page).to have_content("Pipeline ##{pipeline.id} passed")

  wait_for_requests

  expect(page).to have_content('Merged by')
end

Verification

Traced execution with fix:

1. pipeline.set_status('success') updates database
2. wait_for_requests allows frontend polling to complete
3. Frontend receives updated status and renders "Pipeline #25 (closed) passed"
4. Assertion finds expected text
5. Test passes consistently

Confidence: 85-90%

Related

• Closes https://gitlab.com/gitlab-org/quality/test-failure-issues/-/issues/2299

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