test: cover PostHog instrumentation initialization

[cursor]

Summary

• cover the import-time PostHog initialization contract added in merged PR Add PostHog analytics for production traffic on polyagent.pro. #8
• verify analytics-disabled, missing-key, and missing-host paths never initialize the SDK
• assert the production host, profile, pageview/pageleave, and defaults options passed to PostHog

Risky behavior now covered

A configuration regression in this entry point can silently stop analytics, send events to the wrong host, create unwanted person profiles, or duplicate pageview events. The tests isolate module imports and environment variables so each guard is deterministic.

Test files added

• test/instrumentation-client.test.ts

Why this materially reduces regression risk

Existing coverage PRs test production-host gating and component pageview/identity calls, but not the SDK initialization boundary. These tests fail if initialization becomes unconditional, required configuration is ignored, or a behavior-sensitive PostHog option changes. A mutation of capture_pageview from false to true was confirmed to fail the focused test.

Validation

• npm test — 39/39 passing
• npm run build
• npx prettier --check test/instrumentation-client.test.ts

  

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Project	Deployment	Actions	Updated (UTC)
polyagent	Ready	Preview, Comment	Jul 25, 2026 10:07am