diff --git a/package.json b/package.json
index 66181155..4eaed52c 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "scripts": {
     "test": "vitest --dom --coverage",
     "serve:coverage": "npx serve coverage",
-    "emulator": "firebase emulators:start --project test-project --only firestore"
+    "emulators:start": "firebase emulators:start --project test-project"
   },
   "devDependencies": {
     "@tanstack/react-query": "^5.55.4",
diff --git a/packages/react/src/auth/useSignInAnonymouslyMutation.test.tsx b/packages/react/src/auth/useSignInAnonymouslyMutation.test.tsx
index f059d85e..f52b97f2 100644
--- a/packages/react/src/auth/useSignInAnonymouslyMutation.test.tsx
+++ b/packages/react/src/auth/useSignInAnonymouslyMutation.test.tsx
@@ -1,15 +1,22 @@
 import React from "react";
-import { describe, expect, test, beforeEach, vi } from "vitest";
+import {
+  describe,
+  expect,
+  test,
+  beforeEach,
+  afterEach,
+  vi,
+  type MockInstance,
+} from "vitest";
 import { renderHook, act, waitFor } from "@testing-library/react";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
-import { type Auth, type UserCredential } from "firebase/auth";
 import { useSignInAnonymouslyMutation } from "./useSignInAnonymouslyMutation";
+import { auth, wipeAuth } from "~/testing-utils";
 
 const queryClient = new QueryClient({
   defaultOptions: {
-    queries: {
-      retry: false,
-    },
+    queries: { retry: false },
+    mutations: { retry: false },
   },
 });
 
@@ -17,10 +24,14 @@ const wrapper = ({ children }: { children: React.ReactNode }) => (
   <QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
 );
 
-describe("useSignInAnonymously", () => {
-  let auth: Auth;
+describe("useSignInAnonymouslyMutation", () => {
+  beforeEach(async () => {
+    queryClient.clear();
+    await wipeAuth();
+  });
 
-  beforeEach(() => {
+  afterEach(async () => {
+    await auth.signOut();
   });
 
   test("successfully signs in anonymously", async () => {
@@ -28,7 +39,7 @@ describe("useSignInAnonymously", () => {
       wrapper,
     });
 
-    await act(async () => {
+    act(() => {
       result.current.mutate();
     });
 
@@ -39,42 +50,65 @@ describe("useSignInAnonymously", () => {
     expect(result.current.data?.user.isAnonymous).toBe(true);
   });
 
-  test("handles auth error", async () => {
+  test("resets mutation state correctly", async () => {
     const { result } = renderHook(() => useSignInAnonymouslyMutation(auth), {
       wrapper,
     });
 
-    await act(async () => {
-      result.current.mutate();
+    act(() => {
+      result.current.mutateAsync();
     });
 
     await waitFor(() => {
-      expect(result.current.isError).toBe(true);
+      expect(result.current.data?.user.isAnonymous).toBe(true);
+      expect(result.current.isSuccess).toBe(true);
     });
 
-    // expect(result.current.error).toEqual(mockError);
+    act(() => {
+      result.current.reset();
+    });
+
+    await waitFor(() => {
+      expect(result.current.isIdle).toBe(true);
+      expect(result.current.data).toBeUndefined();
+      expect(result.current.error).toBeNull();
+    });
   });
 
-  test("returns pending state initially", async () => {
+  test("allows multiple sequential sign-ins", async () => {
     const { result } = renderHook(() => useSignInAnonymouslyMutation(auth), {
       wrapper,
     });
 
-    // Initially, it should be idle
-    expect(result.current.isIdle).toBe(true);
-
+    // First sign-in
     act(() => {
       result.current.mutate();
     });
 
-    // After mutate is called, it should be loading
     await waitFor(() => {
-      expect(result.current.isPending).toBe(true);
+      expect(result.current.isSuccess).toBe(true);
+      expect(result.current.data?.user.isAnonymous).toBe(true);
+    });
+
+    // Reset state
+    act(() => {
+      result.current.reset();
+    });
+
+    await waitFor(() => {
+      expect(result.current.isIdle).toBe(true);
+      expect(result.current.data).toBeUndefined();
+      expect(result.current.error).toBeNull();
+    });
+
+    // Second sign-in
+    act(() => {
+      result.current.mutate();
     });
 
-    // Once the request is resolved, it should be successful
     await waitFor(() => {
       expect(result.current.isSuccess).toBe(true);
+      expect(result.current.data?.user.isAnonymous).toBe(true);
     });
   });
 });
diff --git a/vitest/utils.ts b/vitest/utils.ts
index f10031bc..d42d3996 100644
--- a/vitest/utils.ts
+++ b/vitest/utils.ts
@@ -1,4 +1,5 @@
 import { type FirebaseApp, FirebaseError, initializeApp } from "firebase/app";
+import { getAuth, connectAuthEmulator, type Auth } from "firebase/auth";
 import {
   getFirestore,
   connectFirestoreEmulator,
@@ -8,16 +9,20 @@ import { expect } from "vitest";
 
 const firebaseTestingOptions = {
   projectId: "test-project",
+  apiKey: "test-api-key",
 };
 
 let app: FirebaseApp | undefined;
 let firestore: Firestore;
+let auth: Auth;
 
 if (!app) {
   app = initializeApp(firebaseTestingOptions);
   firestore = getFirestore(app);
+  auth = getAuth(app);
 
   connectFirestoreEmulator(firestore, "localhost", 8080);
+  connectAuthEmulator(auth, "http://localhost:9099");
 }
 
 async function wipeFirestore() {
@@ -33,6 +38,19 @@ async function wipeFirestore() {
   }
 }
 
+async function wipeAuth() {
+  const response = await fetch(
+    "http://localhost:9099/emulator/v1/projects/test-project/accounts",
+    {
+      method: "DELETE",
+    }
+  );
+
+  if (!response.ok) {
+    throw new Error("Failed to wipe auth");
+  }
+}
+
 function expectFirestoreError(error: unknown, expectedCode: string) {
   if (error instanceof FirebaseError) {
     expect(error).toBeDefined();
@@ -45,4 +63,11 @@ function expectFirestoreError(error: unknown, expectedCode: string) {
   }
 }
 
-export { firestore, wipeFirestore, expectFirestoreError };
+export {
+  firestore,
+  wipeFirestore,
+  expectFirestoreError,
+  firebaseTestingOptions,
+  auth,
+  wipeAuth,
+};