diff --git a/__mocks__/gatsby-plugin-firebase/auth/auth.js b/__mocks__/gatsby-plugin-firebase/auth/auth.js
index 017dfbbc..1dc0db67 100644
--- a/__mocks__/gatsby-plugin-firebase/auth/auth.js
+++ b/__mocks__/gatsby-plugin-firebase/auth/auth.js
@@ -77,6 +77,8 @@ class Auth {
     this._currentUser = null;
 
     await delay(Constants.defaultDelayInMilliseconds);
+
+    this.onAuthStateChangedObservers.forEach((observer) => observer(null));
   }
 }