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test(analytics): repair the PostHog contract tests - #75
The production browser contract (test:posthog:browser) has been failing against codeswhat.com since #66 made the layout render per request. It never ran in CI, so nobody noticed. Its body check trips on Next's RSC router state, which carries the requester's own URL and query back in self.__next_f scripts. That's only reflected to whoever sent the request: the HTML is private, no-store and Cloudflare reports it as DYNAMIC, so nothing is shared-cached, and nothing reaches PostHog.
The browser contract now asserts the HTML isn't shared-cacheable, then checks that nothing outside the flight-data scripts reflects the query. That covers markup, attributes and the PostHog init. It passes against production.
posthog.test.ts resolves posthog-js/lib/src/posthog-core.js by package name instead of a relative node_modules path. It also fails with a clear message if an upgrade drops PostHog#_runBeforeSend. The deep import stays because the main bundle minifies that method away; lib/* is a published file with no exports map.
README-VERCEL lists the browser contract as a post-deploy step. It needs a deployed origin, so it stays out of verify.
- test(analytics): resolve posthog-core by package specifier and fail with a
clear message if an upgrade drops PostHog#_runBeforeSend
- test(analytics): replace the stale body check in the production browser
contract; Next's flight data carries the requester's own query, so assert
the HTML isn't shared-cacheable and that nothing outside the flight-data
scripts reflects it
- docs(deploy): run the browser contract after each promotion
Reviewing files that changed from the base of the PR and between 377988f and 2801dc4.
Files selected for processing: 1
frontend/test/posthog-browser.test.mjs
Files skipped from review as they are similar to previous changes: 1
frontend/test/posthog-browser.test.mjs
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Walkthrough
The changes update the roadmap’s deployment status and remaining work, add production instructions for the PostHog browser test, tighten its response checks, and change the PostHog unit test’s internal import path.
Changes
PostHog verification
Layer / File(s)
Summary
PostHog test and deployment checks frontend/test/posthog-browser.test.mjs, frontend/test/posthog.test.ts, frontend/README-VERCEL.md
The browser test requires private or no-store in Cache-Control, excludes recognized Next.js Flight scripts, requires at least one such script, and checks that query-secret is absent from the remaining HTML. The unit test uses the package lib import path. The deployment guide adds instructions to run the browser test against production.
Roadmap status
Layer / File(s)
Summary
Deployment and remaining work status ROADMAP.md
The roadmap records the promoted dependency and CI updates, the deployed revision and browser check, and the remaining open items.
CodesWhat/codeswhat.com#70: Adds Catalogue per-request rendering that produces the Next.js Flight scripts addressed by the updated browser response test.
Merge Risk: Minimal · up to 2801d
The updated PostHog checks and documentation are ready to merge after normal checks.
Pre-merge checks: 5
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Explanation
Description Check
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Title check
The title clearly identifies the main change: repairing the PostHog contract tests. It matches the browser and unit test updates.
Docstring Coverage
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
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Out of Scope Changes check
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Full details: Docstring Coverage
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No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2 files.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @frontend/test/posthog-browser.test.mjs:
- Around line 20-28: Update the script filtering in the test to exclude only
scripts whose contents match the Next.js Flight call structure, rather than any
script containing the `self.__next_f` literal. Require at least one matching
Flight script before asserting that the remaining response does not reflect the
query.
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Reviewing files that changed from the base of the PR and between e422e9a and 377988f.
Files selected for processing: 4
ROADMAP.md
frontend/README-VERCEL.md
frontend/test/posthog-browser.test.mjs
frontend/test/posthog.test.ts
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Only scripts whose body starts with Next's self.__next_f push call count as
Flight data, and at least one must exist, so a stray script containing the
literal can't hide a reflected query.
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Publishes #75 (tests and docs only, no runtime change). The dev tree matched the reviewed #75 head; dev push verify passed on 0f12865 and this PR's own verify run was skipped as the internal-promotion duplicate. First promotion under the main ruleset, with two counted approvals on the exact head.
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The production browser contract (
test:posthog:browser) has been failing against codeswhat.com since #66 made the layout render per request. It never ran in CI, so nobody noticed. Its body check trips on Next's RSC router state, which carries the requester's own URL and query back inself.__next_fscripts. That's only reflected to whoever sent the request: the HTML isprivate, no-storeand Cloudflare reports it asDYNAMIC, so nothing is shared-cached, and nothing reaches PostHog.posthog.test.tsresolvesposthog-js/lib/src/posthog-core.jsby package name instead of a relativenode_modulespath. It also fails with a clear message if an upgrade dropsPostHog#_runBeforeSend. The deep import stays because the main bundle minifies that method away;lib/*is a published file with no exports map.verify.Tests and docs only, no runtime change. Verified locally: lint, type-check,
test:posthog30/30,test:posthog:browser1/1 against https://codeswhat.com.Summary by CodeRabbit