[MWPW-189268] Add Nala E2E tests for Floodgate for DA

[JackySun9]

Summary

Adds comprehensive Nala end-to-end test coverage for the Floodgate for DA tool (MWPW-189268), running against da.live with the da-floodgate branch.

• 51 test cases across 7 suites: Page Load, Path Validation, Copy (Simple + Real Events), Content Integrity, Promote, Delete, Cancel/Retry, E2E Smoke Chain
• 49 pass, 2 intentional skips, 0 failures at workers=1 (~7 min runtime)
• Real-content seed script pulls 5 production event pages + their fragments into a /drafts/nala-fg-test/ sandbox
• Byte-level content integrity comparator verifies source vs FG copies (with URL-rewrite normalization), including preservation of CaaS-encoded payloads
• Self-healing test data hooks (ensureFileInFg) so delete tests recover from prior-test state changes
• Full English TEST-PLAN.md with execution instructions, prerequisites, and risk register

Test Architecture

File	Purpose
nala/utils/da-login.js	One-time DA login → saves auth.json storageState
nala/features/dafloodgate/floodgate.page.js	Page Object with iframe + shadow DOM traversal + DA admin API helpers
nala/features/dafloodgate/floodgate.spec.js	51 test case definitions with metadata
nala/features/dafloodgate/floodgate.test.js	Playwright test implementations
nala/features/dafloodgate/seed-real-content.js	Seed real event pages + fragments into the sandbox
nala/features/dafloodgate/setup-test-data.js	Verify sandbox state
nala/features/dafloodgate/TEST-PLAN.md	Full test plan documentation

Bugs Surfaced & Fixed (pre-GA)

This test suite caught 2 product bugs which were subsequently fixed on the da-floodgate branch:

1. HIGH — Runtime-loaded fragments not copied (chrono-box dynamic paths missed by Find step)
2. MEDIUM — .link files silently skipped (not in SUPPORTED_FILES)

Both are verified fixed in the latest test run.

How to Run

# One-time setup
node nala/utils/da-login.js                                      # log in to DA
node nala/features/dafloodgate/seed-real-content.js seed         # populate sandbox
node nala/features/dafloodgate/setup-test-data.js                # verify state

# Smoke (~2 min)
npx playwright test nala/features/dafloodgate/ --grep "@smoke" --project=milo-live-chromium --workers=1

# Full suite (~7 min)
npx playwright test nala/features/dafloodgate/ --project=milo-live-chromium --workers=1

# Copy-only (~4 min)
npx playwright test nala/features/dafloodgate/ --grep "@fg-copy" --project=milo-live-chromium --workers=1

Notes

• Tests must run with --workers=1; parallel execution causes race conditions on shared FG repo state.
• auth.json is gitignored — each contributor runs da-login.js once locally.
• Test sandbox: /adobecom/da-events/drafts/nala-fg-test/
• Tool URL: https://da.live/#/adobecom/da-events/tools/floodgate?ref=da-floodgate

Test plan

• Smoke (10/10 pass)
• Full regression (49/49 pass, 2 intentional skips)
• Bugs Add recommendations #1 + Coverage #2 verified fixed
• Reviewed for hardcoded credentials → none found

🤖 Generated with Claude Code

[skumar09]

@JackySun9 we need to remove these test execution from every PR?

cc: @narcis-radu , @SilviuLCF

[github-actions]

This PR does not qualify for the zero-impact label as it touches code outside of the allowed areas. The label is auto applied, do not manually apply the label.

[skumar09]

@JackySun9 ,

• As discussed in the offline Slack chat, thanks for updating the path features/dafloodgate/** to the ignore list so that Floodgate tests are not triggered on PR push/commit commands.
• removing the do-not-merge label

cc: @narcis-radu , @SilviuLCF , @mokimo