fix database tests

Author: Feiyang1

packages/database/test/helpers/util.ts

@@ -117,7 +117,7 @@ export function getQueryValue(query: Query) {
 }
 
 export function pause(milliseconds: number) {
-  return new Promise(resolve => {
+  return new Promise<void>(resolve => {
     setTimeout(() => resolve(), milliseconds);
   });
 }

packages/database/test/info.test.ts

@@ -75,7 +75,7 @@ describe('.info Tests', function () {
   });
 
   it('Can watch .info/connected.', () => {
-    return new Promise(resolve => {
+    return new Promise<void>(resolve => {
       const f = (getRandomNode() as Reference).root;
       f.child('.info/connected').on('value', snap => {
         if (snap.val() === true) {

packages/database/test/order.test.ts

@@ -27,7 +27,7 @@ describe('Order Tests', () => {
   // arrive in that order.  But if we aren't connected yet, the "reconnection" code will send them
   // in the opposite order.
   beforeEach(() => {
-    return new Promise(resolve => {
+    return new Promise<void>(resolve => {
       const ref = getRandomNode() as Reference;
       let connected = false;
       ref.root.child('.info/connected').on('value', s => {