Testing

End-to-end tests run against the full chain:

Playwright → leaflet_svelte (Vite :5173)
                 │   proxies /api → :8000
                 ▼
           stratoflights Django (:8000)
                 │   TAWHIRI_BASE_URL → :8001
                 ▼
           fake_tawhiri stub (:8001)

The real production flow replaces the stub with tawhiri or the Go-based predictor-refactored running on :8080. Any service that speaks the Tawhiri v2 query-string protocol is drop-in compatible.

One-time setup

Python deps for stratoflights (uses sqlite via DJANGO_ENV=production to avoid needing Postgres):

pip install --user --break-system-packages \
  Django djangorestframework djangorestframework-simplejwt drf-spectacular \
  requests django-cors-headers Pillow python-dotenv channels daphne

Initialize the Django DB (sqlite at stratoflights/db.sqlite3):

cd /home/anton/stratoflights
DJANGO_ENV=production python3 manage.py migrate
DJANGO_ENV=production \
  DJANGO_SUPERUSER_USERNAME=demo \
  DJANGO_SUPERUSER_PASSWORD=demo \
  DJANGO_SUPERUSER_EMAIL=demo@demo.demo \
  python3 manage.py createsuperuser --noinput

Playwright browsers (first time only):

cd /home/anton/leaflet_svelte
npx playwright install chromium

Running tests

# Start the full stack (Vite, Django, fake predictor).
scripts/run-stack.sh

# Run the Playwright suite.
npm run test:e2e

# Tear down.
scripts/stop-stack.sh

Individual files: npm run test:e2e -- tests/e2e/workspaces.spec.ts. UI mode for debugging: npm run test:e2e:ui.

Test organization

File	Covers
`auth.spec.ts`	Anonymous → login redirect, form login, already-authed visits
`smoke.spec.ts`	Page loads, MapLibre canvas mounts, navbar renders
`workspaces.spec.ts`	Auto-create, add/remove, prediction render pipeline
`settings.spec.ts`	Locale switch updates UI text live
`saved-points.spec.ts`	Point editor modal opens

Fixtures (tests/e2e/fixtures.ts) provide login(context) / logout(context) helpers that go through page.context().request so cookies are shared with the page.

Key gotchas

Django CSRF is origin-aware. If Playwright hits 127.0.0.1:5173 but CSRF_TRUSTED_ORIGINS only lists localhost:5173, every POST returns 403 with {"detail": "CSRF Failed: Origin checking failed"}. run-stack.sh adds both hostnames to CSRF_TRUSTED_ORIGINS.
Test parallelism is disabled (fullyParallel: false, workers: 1) because fixtures share the Django sqlite DB. If we ever want parallel workers we need per-worker DBs.
The fake tawhiri never fails. To test the frontend's error path you need to either stop the fake or point TAWHIRI_BASE_URL at an unreachable host.
window._lsvMap is only set in dev builds (import.meta.env.DEV), so the workspace render test won't see the layer names in a production bundle.

Swapping in the Go predictor

fake_tawhiri.py is an expedient stub. To swap in the real Go predictor:

cd /home/anton/predictor-refactor/predictor-refactored
PREDICTOR_DATA_DIR=/tmp/predictor-data go run ./cmd/api &
# ^ first run downloads ~9 GB of GFS GRIB data; takes 30–60 minutes.

# Then restart stratoflights with TAWHIRI_BASE_URL pointing at it:
cd /home/anton/stratoflights
TAWHIRI_BASE_URL=http://127.0.0.1:8080/api/v1/ python3 manage.py runserver

Patched files in stratoflights

To make this stack work we made one tiny change in stratoflights so the predictor endpoint is configurable:

# stratoflights_api/services/tawhiri.py
class TawhiriClient:
    BASE_URL = os.getenv("TAWHIRI_BASE_URL", "https://fly.stratonautica.ru/api/v2/")

This is backwards-compatible — the default keeps the existing behavior.

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