Delete Account: started adding unit tests

__mocks__/gatsby-plugin-firebase.js

@@ -1,7 +1,9 @@
 import Auth from './gatsby-plugin-firebase/auth/auth';
 import Database from './gatsby-plugin-firebase/database/database';
+import Functions from './gatsby-plugin-firebase/functions/functions';
 import AuthConstants from './gatsby-plugin-firebase/constants/auth';
 import DatabaseConstants from './gatsby-plugin-firebase/constants/database';
+import FunctionsConstants from './gatsby-plugin-firebase/constants/functions';
 
 class FirebaseStub {
   static auth() {
@@ -11,6 +13,10 @@ class FirebaseStub {
   static database() {
     return Database.instance;
   }
+
+  static functions() {
+    return Functions.instance;
+  }
 }
 
 FirebaseStub.database.ServerValue = {};
@@ -21,4 +27,4 @@ Object.defineProperty(FirebaseStub.database.ServerValue, 'TIMESTAMP', {
 });
 
 export default FirebaseStub;
-export { AuthConstants, DatabaseConstants };
+export { AuthConstants, DatabaseConstants, FunctionsConstants };

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

@@ -0,0 +1,15 @@
+const deleteUserFunctionName = 'deleteUser';
+
+const defaultDelayInMilliseconds = 2000;
+
+class Functions {
+  static get deleteUserFunctionName() {
+    return deleteUserFunctionName;
+  }
+
+  static get defaultDelayInMilliseconds() {
+    return defaultDelayInMilliseconds;
+  }
+}
+
+export default Functions;

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

@@ -0,0 +1,54 @@
+/* eslint-disable no-underscore-dangle */
+import { v4 as uuidv4 } from 'uuid';
+
+import FunctionsConstants from '../constants/functions';
+import HttpsCallableResult from './httpsCallableResult';
+import { delay } from '../../../src/utils/index';
+
+const singleton = Symbol('');
+const singletonEnforcer = Symbol('');
+
+const deleteUser = async () => {
+  await delay(FunctionsConstants.defaultDelayInMilliseconds);
+
+  return new HttpsCallableResult(true);
+};
+
+class Functions {
+  constructor(enforcer) {
+    if (enforcer !== singletonEnforcer) {
+      throw new Error('Cannot construct singleton');
+    }
+
+    this._uuid = uuidv4();
+
+    this._httpsCallables = {};
+    this._httpsCallables[
+      FunctionsConstants.deleteUserFunctionName
+    ] = deleteUser;
+  }
+
+  static get instance() {
+    if (!this[singleton]) {
+      this[singleton] = new Functions(singletonEnforcer);
+    }
+
+    return this[singleton];
+  }
+
+  get uuid() {
+    return this._uuid;
+  }
+
+  httpsCallable(name) {
+    if (!name) {
+      throw new Error('name must be provided.');
+    } else if (typeof name !== 'string') {
+      throw new Error('name should be a string.');
+    }
+
+    return this._httpsCallables[name];
+  }
+}
+
+export default Functions;

__mocks__/gatsby-plugin-firebase/functions/httpsCallableResult.js

@@ -0,0 +1,19 @@
+/* eslint-disable no-underscore-dangle */
+import { v4 as uuidv4 } from 'uuid';
+
+class HttpsCallableResult {
+  constructor(data) {
+    this._uuid = uuidv4();
+    this._data = data;
+  }
+
+  get data() {
+    return this._data;
+  }
+
+  get uuid() {
+    return this._uuid;
+  }
+}
+
+export default HttpsCallableResult;