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

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

@@ -0,0 +1,29 @@
+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();
+    });
+  });
+});