Added MSW handlers, mock fixtures, and Vitest+Playwright test harness for functional test migration

[carterworks]

Changed Packages

• core
• reactor-extension

Description

Adds the shared infrastructure required by all subsequent integration test migration PRs: MSW request handlers, JSON mock response fixtures, updated test fixtures (extend.js), legacyCookies.js utility, consent.js constants, and the functional migration plan document. No functional test files are replaced by this PR — it is the foundation.

Related Issue

Part of the functional test → integration test migration. See packages/browser/test/FUNCTIONAL_MIGRATION_PLAN.md.

Motivation and Context

The existing TestCafe functional test suite is being migrated to Vitest+Playwright+MSW to enable faster, more reliable CI testing without a running server. This PR is part of a stacked series — each PR migrates one test file.

Functional tests replaced:

• None (infrastructure only)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (non-breaking change which does not add functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have added a Changeset file with a consumer-facing description of my changes.
• I have signed the Adobe Open Source CLA or I'm an Adobe employee.
• I have made any necessary test changes and all tests pass.
• I have run the Sandbox successfully.

Stack

1. Added MSW handlers, mock fixtures, and Vitest+Playwright test harness for functional test migration #1532 👈 current
2. Migrated Install SDK functional tests to Vitest+Playwright+MSW #1533

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Latest commit: d5d8556

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[greptile-apps]

Greptile Summary

This PR adds the shared infrastructure for migrating the TestCafe functional test suite to Vitest+Playwright+MSW: new MSW handlers, JSON fixtures, consent/cookie utilities, updated test fixtures, and the migration plan document. No functional test files are deleted — this is a pure foundation layer.

• handlers.js: Added acquireHandler for the identity/acquire endpoint; updated sendEventHandler and setConsentHandler to support a configId:suffix override pattern and made setConsentHandler return a consent state that mirrors the incoming request payload.
• extend.js / clean.js: Extended the alloy fixture to delete kndctr_ and AMCV_ cookies before each test, and added teardown for click listeners tracked by the new setupBaseCode monkeypatch.
• New files: consent.js (Adobe 1.0/2.0 + IAB TCF constants), legacyCookies.js (AMCV/s_ecid cookie helpers), six new JSON response fixtures, and the migration plan document.

Confidence Score: 4/5

Safe to merge for non-migration tests; the s_ecid cookie gap will cause cross-test pollution once tests that call setSecidCookie() are added in subsequent PRs

The cookie cleanup introduced in extend.js deliberately handles kndctr_ and AMCV_ cookies, but the new setSecidCookie() utility sets s_ecid, which is the Visitor ID Service ECID-sync cookie Alloy reads during ID migration. Without cleaning it between tests, any test that calls setSecidCookie() will contaminate the Alloy identity state for every subsequent test in the same browser context.

packages/browser/test/integration/helpers/testsSetup/extend.js — the cookie cleanup predicate needs || name === 's_ecid' to match the new setSecidCookie utility

Important Files Changed

Filename	Overview
packages/browser/test/integration/helpers/testsSetup/extend.js	Cookie cleanup added but misses s_ecid, which will leak between tests that call the new setSecidCookie() utility
packages/browser/test/integration/helpers/mswjs/handlers.js	Added acquireHandler for identity/acquire endpoint and updated sendEventHandler/setConsentHandler to support configId override suffix; consent response now reflects actual consent state passed in the request body
packages/browser/test/integration/helpers/utils/legacyCookies.js	New AMCV/s_ecid cookie helpers for ID-migration tests; getCookie handles both encoded and unencoded cookie names correctly
packages/browser/test/integration/helpers/alloy/clean.js	Added click-listener teardown to flush __alloyClickListeners tracked by the setupBaseCode monkeypatch
packages/browser/test/integration/helpers/alloy/setupBaseCode.js	Monkeypatches document.addEventListener once per page lifetime to record click listeners in __alloyClickListeners for cleanup; only tracks document-level handlers
packages/browser/test/integration/helpers/constants/consent.js	New constants for Adobe 1.0/2.0 and IAB TCF consent payloads used across consent integration tests
packages/browser/test/functional/specs/Personalization/C17409728.js	Fixed broken import paths for createDecorateProposition.js and initDomActionsModules.js after the Personalization component moved from core/src to browser/src
packages/browser/test/FUNCTIONAL_MIGRATION_PLAN.md	New migration plan document outlining TestCafe to Vitest+Playwright+MSW strategy, parity matrix, helper translation layer, and execution sequence

Sequence Diagram

sequenceDiagram
    participant Test as Integration Test
    participant Ext as extend.js (alloy fixture)
    participant SBC as setupBaseCode.js
    participant MSW as MSW Worker
    participant Handler as handlers.js
    participant Edge as Edge Network (mocked)

    Test->>Ext: fixture setup
    Ext->>Ext: delete kndctr_/AMCV_ cookies
    Ext->>SBC: setupBaseCode()
    SBC->>SBC: monkeypatch document.addEventListener (once)
    Ext->>Edge: setupAlloy() - identity/acquire
    MSW->>Handler: acquireHandler intercepts
    Handler-->>Edge: acquireResponse.json
    Edge-->>Ext: alloy instance ready
    Ext->>Test: use(alloy)
    Test->>Edge: alloy commands
    MSW->>Handler: sendEventHandler / setConsentHandler
    Handler-->>Edge: fixture JSON
    Edge-->>Test: response
    Test->>Ext: teardown
    Ext->>SBC: cleanAlloy()
    Ext->>MSW: worker.resetHandlers()

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