feat(auth): create login api call with basic test coverage and msw mock

src/features/auth/api/calls/index.ts

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+export * from "./login";

src/features/auth/api/calls/login/constants.ts

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+export const LOGIN_API_ROUTE = "auth/login";
+
+// MOCKS
+export const MOCK_EMAIL = "test@test.com";
+export const MOCK_PASSWORD = "password";
+export const MOCK_TOKEN = "mock.access.token";

src/features/auth/api/calls/login/index.ts

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+export { login } from './login';
+export { LOGIN_API_ROUTE } from './constants';

src/features/auth/api/calls/login/login.mock.ts

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+import { http, HttpResponse } from "msw";
+import type { AuthData } from "../../../model/types/service";
+import { BASE_URL } from "shared/config";
+import {
+  LOGIN_API_ROUTE,
+  MOCK_EMAIL,
+  MOCK_PASSWORD,
+  MOCK_TOKEN,
+} from "./constants";
+
+const LOGIN_URL = `${BASE_URL}/${LOGIN_API_ROUTE}`;
+
+/**
+ * Msw interceptor. Mocks the login endpoint response.
+ */
+export const loginMock = http.post(LOGIN_URL, async ({ request }) => {
+  const { email, password } = (await request.json()) as AuthData;
+
+  if (email === MOCK_EMAIL && password === MOCK_PASSWORD) {
+    return HttpResponse.json({
+      accessToken: MOCK_TOKEN,
+      user: { id: "1", email },
+    });
+  }
+
+  return HttpResponse.json({ message: "Invalid credentials" }, { status: 401 });
+});

src/features/auth/api/calls/login/login.spec.ts

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+import { setupServer } from "msw/node";
+import { login } from "./login";
+import { loginMock } from "./login.mock";
+import { MOCK_EMAIL, MOCK_PASSWORD } from "./constants";
+
+const server = setupServer(loginMock);
+
+describe("login", () => {
+  beforeAll(() => server.listen({ onUnhandledRequest: "error" }));
+  afterEach(() => server.resetHandlers());
+  afterAll(() => server.close());
+
+  describe("happy path", () => {
+    it("returns access token and user on valid credentials", async () => {
+      const result = await login({ email: MOCK_EMAIL, password: MOCK_PASSWORD });
+
+      expect(result.accessToken).toBe("mock.access.token");
+      expect(result.user).toEqual({ id: "1", email: MOCK_EMAIL });
+    });
+  });
+
+  describe("error cases", () => {
+    it("throws on invalid credentials", async () => {
+      await expect(
+        login({ email: "wrong@test.com", password: "wrong" }),
+      ).rejects.toThrow();
+    });
+  });
+});

src/features/auth/api/calls/login/login.ts

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+import { api } from "../../../api";
+import type { AuthData, AuthResponse } from "../../../model/types/service";
+import { LOGIN_API_ROUTE } from "./constants";
+
+/**
+ * Logs in a user with the given email and password.
+ *
+ * @param loginData - The user's login data (email and password).
+ * @returns A promise that resolves to the authentication response.
+ */
+export function login(loginData: AuthData) {
+  return api.post(LOGIN_API_ROUTE, { json: loginData }).json<AuthResponse>();
+}