A coding agent could develop this repo's Go packages and could not develop the application: every path to running YellowJacket ended in a blocking GTK window, so 265 bound methods, 46 events, 33 component directories and 13 stores had exactly one form of verification available — `tsc --noEmit`. The unlock is that `wails dev`'s dev server on :34115 serves the real frontend with the real generated bindings against the same Go backend a desktop window attaches to, so a plain Chromium under Xvfb gets a fully functional app. Four test tiers now exist, cheapest first: - `make ui-test` — 313 Vitest tests in a real browser in ~2 s, no app, no backend, no display. Works because `frontend/wailsjs/` is a pure passthrough to `window.go`/`window.runtime`, so faking just those two globals runs the real bindings and the real store code. - `make test` — services in-process, asserting on the payload the frontend would receive, via a new `events.Emit` wrapper. - `make dev-headless` + `playwright-cli` — the real app, driven interactively, with an event bridge on `window.__yjEvents` and a dev-only control surface at `/__test/`. - `make e2e` — 19 of those flows frozen as Playwright specs. `events.Emit(ctx, …)` replaces all 35 direct `runtime.EventsEmit` call sites: wails' `getEvents` `log.Fatalf`s on any context without its runtime, so those paths could not run under test and a background worker could take the app down. Four packages had each hand-rolled the same guard; nine more guarded on `ctx != nil`, which does not help. `TestNoDirectRuntimeEmits` fails the build on a new one. Fixtures are generated, not committed (`make testdata`), and seeds are built by *running the app* — never by hand-writing config and DB rows, which would be a second description of a valid YJ_HOME. `.gitea/workflows/ci.yml` is the first workflow here that tests anything; the other three only package, so `gitea_ci` reported only packaging jobs and misled anyone asking whether a push was healthy. Both jobs were prototyped to green in a bare ubuntu:24.04 container before the YAML was written, which immediately caught `make lint` linting three configurations that nothing builds: all three passes omitted `webkit2_41`, so wails resolved webkit2gtk-4.0 — which Arch still ships and Ubuntu 24.04 dropped. Operational instructions live in `.pi/skills/yellowjacket-dev/`, measured discoveries in `.planning/NOTES.md`, and architecture in `CLAUDE.md` — split by tense, not by topic, because a topical split gives every new fact two plausible homes. `make skill-check` fails a commit if the skill cites a make target that does not exist.
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Request Mocking
Intercept, mock, modify, and block network requests.
CLI Route Commands
# Mock with custom status
playwright-cli route "**/*.jpg" --status=404
# Mock with JSON body
playwright-cli route "**/api/users" --body='[{"id":1,"name":"Alice"}]' --content-type=application/json
# Mock with custom headers
playwright-cli route "**/api/data" --body='{"ok":true}' --header="X-Custom: value"
# Remove headers from requests
playwright-cli route "**/*" --remove-header=cookie,authorization
# List active routes
playwright-cli route-list
# Remove a route or all routes
playwright-cli unroute "**/*.jpg"
playwright-cli unroute
URL Patterns
**/api/users - Exact path match
**/api/*/details - Wildcard in path
**/*.{png,jpg,jpeg} - Match file extensions
**/search?q=* - Match query parameters
Advanced Mocking with run-code
For conditional responses, request body inspection, response modification, or delays:
Conditional Response Based on Request
playwright-cli run-code "async page => {
await page.route('**/api/login', route => {
const body = route.request().postDataJSON();
if (body.username === 'admin') {
route.fulfill({ body: JSON.stringify({ token: 'mock-token' }) });
} else {
route.fulfill({ status: 401, body: JSON.stringify({ error: 'Invalid' }) });
}
});
}"
Modify Real Response
playwright-cli run-code "async page => {
await page.route('**/api/user', async route => {
const response = await route.fetch();
const json = await response.json();
json.isPremium = true;
await route.fulfill({ response, json });
});
}"
Simulate Network Failures
playwright-cli run-code "async page => {
await page.route('**/api/offline', route => route.abort('internetdisconnected'));
}"
# Options: connectionrefused, timedout, connectionreset, internetdisconnected
Delayed Response
playwright-cli run-code "async page => {
await page.route('**/api/slow', async route => {
await new Promise(r => setTimeout(r, 3000));
route.fulfill({ body: JSON.stringify({ data: 'loaded' }) });
});
}"