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scrabble-game/gateway/internal/webui/webui_test.go
T
Ilia Denisov 990cb4a68d
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feat(pwa): installable web app + landing web entry
Make the web SPA an installable PWA and surface it to users:

- manifest.webmanifest + an install-only service worker + 192/512/maskable
  icons (ui/public); PWA head tags in index.html; the .webmanifest MIME type
  registered in the gateway (the distroless image has no /etc/mime.types).
- Platform-adaptive install CTA (components/InstallApp.svelte + lib/pwa):
  one-tap on Chromium, manual Add-to-Home-Screen instructions on iOS Safari,
  hidden elsewhere / once installed / inside a Mini App. Shown under the
  logged-out login card and at the bottom of Settings.
- The landing gains a third entry linking /app/ (the brand tile), with a
  caption under all three (Telegram / VK / Веб-версия).

The service worker is navigation-only (network-first, cached-shell fallback);
hashed assets and the Connect stream are untouched. It exists to satisfy
Chromium's installability requirement and is the single growth point for a
future opt-in offline mode.

Tests: pwa.ts unit tests; a webui probe (manifest/sw.js content-type + the
SPA-fallback-to-HTML trap); e2e for the one-tap CTA, the iOS instructions
modal and the landing web entry. Docs: ARCHITECTURE §13, FUNCTIONAL (+ru),
gateway README.
2026-07-05 21:05:52 +02:00

112 lines
4.6 KiB
Go

package webui
import (
"io"
"net/http"
"net/http/httptest"
"strings"
"testing"
"testing/fstest"
)
// get drives the handler with a GET for the given path and returns the response.
func get(t *testing.T, h http.Handler, target string) *http.Response {
t.Helper()
rec := httptest.NewRecorder()
h.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, target, nil))
return rec.Result()
}
func body(t *testing.T, resp *http.Response) string {
t.Helper()
b, _ := io.ReadAll(resp.Body)
return string(b)
}
// TestShellNoCache: the served HTML shell carries no-cache so a new deploy's
// shell (and the asset URLs it references) is fetched fresh.
func TestShellNoCache(t *testing.T) {
h := Handler("/app/", "index.html")
if cc := get(t, h, "/app/").Header.Get("Cache-Control"); cc != "no-cache" {
t.Errorf("shell Cache-Control = %q, want no-cache", cc)
}
}
// TestAppMountServesShellStripsPrefixAndCachesAssets: "/app/" and "/telegram/" serve the app
// shell (index.html), strip their prefix, fall back for deep links, and mark hash-named
// assets immutable.
func TestAppMountServesShellStripsPrefixAndCachesAssets(t *testing.T) {
for _, prefix := range []string{"/app/", "/telegram/"} {
h := Handler(prefix, "index.html")
if resp := get(t, h, prefix); resp.StatusCode != http.StatusOK || !strings.Contains(body(t, resp), "scrabble-app-shell") {
t.Fatalf("GET %s did not serve the app shell (status %d)", prefix, resp.StatusCode)
}
// A deep link falls back to the shell so the hash router can take over.
if resp := get(t, h, prefix+"game/abc"); resp.StatusCode != http.StatusOK || !strings.Contains(body(t, resp), "scrabble-app-shell") {
t.Fatalf("GET %sgame/abc did not fall back to the app shell (status %d)", prefix, resp.StatusCode)
}
// A hash-named asset is served directly and marked immutable.
resp := get(t, h, prefix+"assets/.gitkeep")
if resp.StatusCode != http.StatusOK {
t.Fatalf("GET %sassets/.gitkeep status = %d, want 200", prefix, resp.StatusCode)
}
if cc := resp.Header.Get("Cache-Control"); !strings.Contains(cc, "immutable") {
t.Errorf("asset Cache-Control = %q, want immutable", cc)
}
}
}
// testFS mirrors what Vite emits into dist/: the SPA shell, the PWA manifest + service worker at
// the root (copied from ui/public), and a hash-named asset. The compile-time embedded dist/ holds
// only a placeholder shell, so the manifest/sw.js serving is exercised over this in-memory FS.
func testFS() fstest.MapFS {
return fstest.MapFS{
"index.html": {Data: []byte("<!doctype html><title>shell</title>")},
"manifest.webmanifest": {Data: []byte(`{"name":"Эрудит"}`)},
"sw.js": {Data: []byte("self.addEventListener('fetch', () => {});")},
"assets/app-abc123.js": {Data: []byte("export const x = 1;")},
}
}
// TestHandlerServesManifestWithManifestType: the PWA manifest is served with the manifest MIME
// type (registered in init, since the distroless image has no /etc/mime.types), not sniffed to
// text/plain, which some browsers reject.
func TestHandlerServesManifestWithManifestType(t *testing.T) {
h := handlerFor(testFS(), "/app/", "index.html")
resp := get(t, h, "/app/manifest.webmanifest")
if resp.StatusCode != http.StatusOK {
t.Fatalf("status = %d, want 200", resp.StatusCode)
}
if ct := resp.Header.Get("Content-Type"); !strings.HasPrefix(ct, "application/manifest+json") {
t.Errorf("Content-Type = %q, want application/manifest+json", ct)
}
}
// TestHandlerServesServiceWorkerAsJavaScript: sw.js is served as JavaScript from the root, so its
// registration (scope /app/) succeeds.
func TestHandlerServesServiceWorkerAsJavaScript(t *testing.T) {
h := handlerFor(testFS(), "/app/", "index.html")
resp := get(t, h, "/app/sw.js")
if resp.StatusCode != http.StatusOK {
t.Fatalf("status = %d, want 200", resp.StatusCode)
}
if ct := resp.Header.Get("Content-Type"); !strings.HasPrefix(ct, "text/javascript") {
t.Errorf("Content-Type = %q, want text/javascript", ct)
}
}
// TestHandlerFallsBackToShellForUnknownManifestPath guards the trap: a manifest/sw path NOT emitted
// into dist/ falls back to the SPA shell as text/html, on which SW registration would fail. The two
// tests above pin that the real files are served instead of the shell.
func TestHandlerFallsBackToShellForUnknownManifestPath(t *testing.T) {
h := handlerFor(testFS(), "/app/", "index.html")
resp := get(t, h, "/app/not-emitted.webmanifest")
if resp.StatusCode != http.StatusOK {
t.Fatalf("status = %d, want 200", resp.StatusCode)
}
if ct := resp.Header.Get("Content-Type"); !strings.HasPrefix(ct, "text/html") {
t.Errorf("Content-Type = %q, want text/html (SPA shell fallback)", ct)
}
}