Firebase Stub: introduced a delay in all async functions to better mimic real Firebase

__mocks__/gatsby-plugin-firebase/auth/auth.js

@@ -2,6 +2,7 @@
 import { v4 as uuidv4 } from 'uuid';
 
 import Constants from '../constants/auth';
+import delay from '../utils/index';
 
 const singleton = Symbol('');
 const singletonEnforcer = Symbol('');
@@ -49,6 +50,8 @@ class Auth {
   async signInAnonymously() {
     const user = Constants.anonymousUser1;
 
+    await delay(Constants.defaultDelayInMilliseconds);
+
     this.onAuthStateChangedObservers.forEach((observer) => observer(user));
 
     return Promise.resolve(user);

__mocks__/gatsby-plugin-firebase/constants/auth.js

@@ -14,6 +14,8 @@ const anonymousUser2 = {
   uid: 'anonym456',
 };
 
+const defaultDelayInMilliseconds = 100;
+
 class Auth {
   static get anonymousUser1() {
     return anonymousUser1;
@@ -22,6 +24,10 @@ class Auth {
   static get anonymousUser2() {
     return anonymousUser2;
   }
+
+  static get defaultDelayInMilliseconds() {
+    return defaultDelayInMilliseconds;
+  }
 }
 
 export default Auth;

__mocks__/gatsby-plugin-firebase/database/reference.js

@@ -4,6 +4,7 @@ import { debounce } from 'lodash';
 
 import DatabaseConstants from '../constants/database';
 import DataSnapshot from './dataSnapshot';
+import delay from '../utils/index';
 
 const parsePath = (path) => {
   if (!path) {
@@ -183,9 +184,7 @@ class Reference {
       throw new Error('eventType should be a string.');
     }
 
-    await new Promise((resolve) =>
-      setTimeout(resolve, DatabaseConstants.defaultDelayInMilliseconds),
-    );
+    await delay(DatabaseConstants.defaultDelayInMilliseconds);
 
     return Promise.resolve(this._dataSnapshot);
   }
@@ -196,21 +195,27 @@ class Reference {
   }
 
   async update(value) {
+    await delay(DatabaseConstants.defaultDelayInMilliseconds);
+
     this._handleDataUpdate(value);
 
-    return Promise.resolve(true);
+    return Promise.resolve();
   }
 
   async remove() {
+    await delay(DatabaseConstants.defaultDelayInMilliseconds);
+
     this._handleDataUpdate(null);
 
-    return Promise.resolve(true);
+    return Promise.resolve();
   }
 
   async set(value) {
+    await delay(DatabaseConstants.defaultDelayInMilliseconds);
+
     this._handleDataUpdate(value);
 
-    return Promise.resolve(true);
+    return Promise.resolve();
   }
 }
 

__mocks__/gatsby-plugin-firebase/utils/index.js

@@ -0,0 +1,5 @@
+const delay = async (milliseconds) => {
+  await new Promise((resolve) => setTimeout(resolve, milliseconds));
+};
+
+export default delay;