fix(frontend): address static demo PR review comments

frontend/tests/unit/core/artifacts/utils.test.ts

@@ -0,0 +1,69 @@
+import { afterEach, beforeEach, describe, expect, test, vi } from "vitest";
+
+const ENV_KEYS = [
+  "NEXT_PUBLIC_BACKEND_BASE_URL",
+  "NEXT_PUBLIC_STATIC_WEBSITE_ONLY",
+] as const;
+
+type EnvSnapshot = Partial<
+  Record<(typeof ENV_KEYS)[number], string | undefined>
+>;
+
+function snapshotEnv(): EnvSnapshot {
+  const snapshot: EnvSnapshot = {};
+  for (const key of ENV_KEYS) {
+    snapshot[key] = process.env[key];
+  }
+  return snapshot;
+}
+
+function setEnv(key: (typeof ENV_KEYS)[number], value: string | undefined) {
+  const env = process.env as Record<string, string | undefined>;
+  if (value === undefined) {
+    delete env[key];
+  } else {
+    env[key] = value;
+  }
+}
+
+function restoreEnv(snapshot: EnvSnapshot) {
+  for (const key of ENV_KEYS) {
+    setEnv(key, snapshot[key]);
+  }
+}
+
+async function loadFreshArtifactUtils() {
+  vi.resetModules();
+  return await import("@/core/artifacts/utils");
+}
+
+describe("artifact URL helpers", () => {
+  let saved: EnvSnapshot;
+
+  beforeEach(() => {
+    saved = snapshotEnv();
+    setEnv("NEXT_PUBLIC_BACKEND_BASE_URL", undefined);
+    setEnv("NEXT_PUBLIC_STATIC_WEBSITE_ONLY", undefined);
+  });
+
+  afterEach(() => {
+    restoreEnv(saved);
+  });
+
+  test("maps static demo artifact paths to bundled public files", async () => {
+    setEnv("NEXT_PUBLIC_STATIC_WEBSITE_ONLY", "true");
+
+    const { resolveArtifactURL, urlOfArtifact } =
+      await loadFreshArtifactUtils();
+
+    expect(
+      urlOfArtifact({
+        filepath: "/mnt/user-data/outputs/index.html",
+        threadId: "thread-1",
+      }),
+    ).toBe("/demo/threads/thread-1/user-data/outputs/index.html");
+    expect(
+      resolveArtifactURL("/mnt/user-data/outputs/style.css", "thread-1"),
+    ).toBe("/demo/threads/thread-1/user-data/outputs/style.css");
+  });
+});