feat: implement esting suite using Vitest and add to ci

frontend/test/fixtures/user.fixture.ts

@@ -0,0 +1,5 @@
+export const mockUser = {
+  public_id: "123e4567-e89b-12d3-a456-426614174000",
+  email: "test@example.com",
+  full_name: "Test User",
+};

frontend/test/mocks/server.ts

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+import { HttpResponse, http } from "msw";
+import { setupServer } from "msw/node";
+import { mockUser } from "../fixtures/user.fixture";
+
+const apiServerHost = "http://piku-server";
+
+export const successHandlers = [
+  http.post(`http://${apiServerHost}/api/auth/login/`, () =>
+    HttpResponse.json({ access: "mock-access-token" }),
+  ),
+  http.post(`http://${apiServerHost}/api/auth/refresh/`, () =>
+    HttpResponse.json({ access: "new-access-token" }),
+  ),
+  http.get(`http://${apiServerHost}/api/auth/me/`, () =>
+    HttpResponse.json(mockUser),
+  ),
+  http.post(`http://${apiServerHost}/api/auth/logout/`, () =>
+    HttpResponse.json({}),
+  ),
+];
+
+export const errorHandlers = [
+  http.post(`http://${apiServerHost}/api/auth/login/`, () =>
+    HttpResponse.json({ error: "Invalid credentials" }, { status: 400 }),
+  ),
+  http.post(`http://${apiServerHost}/api/auth/refresh/`, () =>
+    HttpResponse.json({ error: "Invalid Token" }, { status: 401 }),
+  ),
+  http.get(`http://${apiServerHost}/api/auth/me/`, () =>
+    HttpResponse.json({ error: "Invalid Token" }, { status: 401 }),
+  ),
+];
+
+export const server = setupServer(...successHandlers);

frontend/test/setup.ts

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+import "@testing-library/jest-dom";
+import { IDBFactory } from "fake-indexeddb";
+import { afterAll, afterEach, beforeAll } from "vitest";
+import { server } from "./mocks/server";
+
+/**
+ * faking indexeddb in memory for testing crypto key storage
+ */
+Object.defineProperty(globalThis, "indexedDB", {
+  value: new IDBFactory(),
+  writable: true,
+  configurable: true,
+});
+
+beforeAll(() => server.listen({ onUnhandledRequest: "warn" }));
+afterEach(() => server.resetHandlers());
+afterAll(() => server.close());