diff --git a/packages/testing/src/api/index.ts b/packages/testing/src/api/index.ts
index 7da634d9cb8..6f7cd64a2a1 100644
--- a/packages/testing/src/api/index.ts
+++ b/packages/testing/src/api/index.ts
@@ -16,12 +16,15 @@
  */
 
 import * as firebase from 'firebase';
+import { _FirebaseApp } from '@firebase/app-types/private';
+import { FirebaseAuthInternal } from '@firebase/auth-interop-types';
 import * as request from 'request';
 import { base64 } from '@firebase/util';
 import { setLogLevel, LogLevel } from '@firebase/logger';
 import * as grpc from 'grpc';
 import * as protoLoader from '@grpc/proto-loader';
 import { resolve } from 'path';
+import { Component, ComponentType } from '@firebase/component';
 
 export { database, firestore } from 'firebase';
 
@@ -126,8 +129,22 @@ function initializeApp(
   let app = firebase.initializeApp(appOptions, appName);
   // hijacking INTERNAL.getToken to bypass FirebaseAuth and allows specifying of auth headers
   if (accessToken) {
-    (app as any).INTERNAL.getToken = () =>
-      Promise.resolve({ accessToken: accessToken });
+    const mockAuthComponent = new Component(
+      'auth-internal',
+      () =>
+        ({
+          getToken: () => Promise.resolve({ accessToken: accessToken }),
+          getUid: () => null,
+          addAuthTokenListener: () => {},
+          removeAuthTokenListener: () => {}
+        } as FirebaseAuthInternal),
+      ComponentType.PRIVATE
+    );
+
+    ((app as unknown) as _FirebaseApp)._addComponent(
+      mockAuthComponent,
+      /* overwrite */ true
+    );
   }
   if (databaseName) {
     // Toggle network connectivity to force a reauthentication attempt.
diff --git a/packages/testing/test/database.test.ts b/packages/testing/test/database.test.ts
index b265e7df6ad..b04574ec400 100644
--- a/packages/testing/test/database.test.ts
+++ b/packages/testing/test/database.test.ts
@@ -19,6 +19,7 @@ import * as chai from 'chai';
 import * as chaiAsPromised from 'chai-as-promised';
 import * as firebase from '../src/api';
 import { base64 } from '@firebase/util';
+import { _FirebaseApp } from '@firebase/app-types/private';
 
 const expect = chai.expect;
 
@@ -60,8 +61,12 @@ describe('Testing Module Tests', function() {
       projectId: 'foo',
       auth: undefined
     });
-    const token = await (app as any).INTERNAL.getToken();
-    expect(token).to.be.null;
+
+    const authInternal = ((app as unknown) as _FirebaseApp).container
+      .getProvider('auth-internal')
+      .getImmediate({ optional: true });
+    // Auth instance will not be available because no API Key is provided
+    expect(authInternal).to.be.null;
   });
 
   it('initializeTestApp() with auth sets the correct access token', async function() {
@@ -70,10 +75,14 @@ describe('Testing Module Tests', function() {
       projectId: 'foo',
       auth: auth
     });
-    const token = await (app as any).INTERNAL.getToken();
+    const authInternal = ((app as unknown) as _FirebaseApp).container
+      .getProvider('auth-internal')
+      .getImmediate();
+
+    const token = await authInternal.getToken();
     expect(token).to.have.keys('accessToken');
     const claims = JSON.parse(
-      base64.decodeString(token.accessToken.split('.')[1], /*webSafe=*/ false)
+      base64.decodeString(token!.accessToken.split('.')[1], /*webSafe=*/ false)
     );
     // We add an 'iat' field.
     expect(claims).to.deep.equal({ uid: auth.uid, iat: 0, sub: auth.uid });
@@ -81,9 +90,13 @@ describe('Testing Module Tests', function() {
 
   it('initializeAdminApp() sets the access token to "owner"', async function() {
     const app = firebase.initializeAdminApp({ projectId: 'foo' });
-    const token = await (app as any).INTERNAL.getToken();
+    const authInternal = ((app as unknown) as _FirebaseApp).container
+      .getProvider('auth-internal')
+      .getImmediate();
+
+    const token = await authInternal.getToken();
     expect(token).to.have.keys('accessToken');
-    expect(token.accessToken).to.be.string('owner');
+    expect(token!.accessToken).to.be.string('owner');
   });
 
   it('loadDatabaseRules() throws if no databaseName or rules', async function() {