From 5a880c666377b14aa7d68fe5e8db42a1b5aaf218 Mon Sep 17 00:00:00 2001
From: Yuchen Shi <yuchenshi@google.com>
Date: Mon, 9 Dec 2019 16:32:06 -0800
Subject: [PATCH] Implement addAuthTokenListener in testing. Fix #2417. (#2423)

---
 packages/testing/src/api/index.ts | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/packages/testing/src/api/index.ts b/packages/testing/src/api/index.ts
index 94b6eaf7918..b4114e2de76 100644
--- a/packages/testing/src/api/index.ts
+++ b/packages/testing/src/api/index.ts
@@ -127,7 +127,6 @@ function initializeApp(
   }
   const appName = 'app-' + new Date().getTime() + '-' + Math.random();
   let app = firebase.initializeApp(appOptions, appName);
-  // hijacking INTERNAL.getToken to bypass FirebaseAuth and allows specifying of auth headers
   if (accessToken) {
     const mockAuthComponent = new Component(
       'auth-internal',
@@ -135,7 +134,10 @@ function initializeApp(
         ({
           getToken: async () => ({ accessToken: accessToken }),
           getUid: () => null,
-          addAuthTokenListener: () => {},
+          addAuthTokenListener: (listener) => {
+            // Call listener once immediately with predefined accessToken.
+            listener(accessToken);
+          },
           removeAuthTokenListener: () => {}
         } as FirebaseAuthInternal),
       ComponentType.PRIVATE