[APM] Fix some warnings logged in APM tests

x-pack/legacy/plugins/apm/public/components/app/TransactionOverview/__jest__/TransactionOverview.test.tsx

@@ -18,6 +18,7 @@ import { history } from '../../../../utils/history';
 import { TransactionOverview } from '..';
 import { IUrlParams } from '../../../../context/UrlParamsContext/types';
 import * as useServiceTransactionTypesHook from '../../../../hooks/useServiceTransactionTypes';
+import * as useFetcherHook from '../../../../hooks/useFetcher';
 import { fromQuery } from '../../../shared/Links/url_helpers';
 import { Router } from 'react-router-dom';
 import { UrlParamsProvider } from '../../../../context/UrlParamsContext';
@@ -51,6 +52,8 @@ function setup({
     .spyOn(useServiceTransactionTypesHook, 'useServiceTransactionTypes')
     .mockReturnValue(serviceTransactionTypes);
 
+  jest.spyOn(useFetcherHook, 'useFetcher').mockReturnValue({} as any);
+
   return render(
     <KibanaCoreContext.Provider value={coreMock}>
       <Router history={history}>

x-pack/legacy/plugins/apm/public/components/shared/DatePicker/__test__/DatePicker.test.tsx

@@ -10,13 +10,13 @@ import {
   UrlParamsContext,
   useUiFilters
 } from '../../../../context/UrlParamsContext';
-import { tick } from '../../../../utils/testHelpers';
 import { DatePicker } from '../index';
 import { IUrlParams } from '../../../../context/UrlParamsContext/types';
 import { history } from '../../../../utils/history';
 import { mount } from 'enzyme';
 import { EuiSuperDatePicker } from '@elastic/eui';
 import { MemoryRouter } from 'react-router-dom';
+import { wait } from '@testing-library/react';
 
 const mockHistoryPush = jest.spyOn(history, 'push');
 const mockRefreshTimeRange = jest.fn();
@@ -84,7 +84,7 @@ describe('DatePicker', () => {
     });
     expect(mockRefreshTimeRange).not.toHaveBeenCalled();
     jest.advanceTimersByTime(1000);
-    await tick();
+    await wait();
     expect(mockRefreshTimeRange).toHaveBeenCalled();
     wrapper.unmount();
   });
@@ -94,7 +94,7 @@ describe('DatePicker', () => {
     mountDatePicker({ refreshPaused: true, refreshInterval: 1000 });
     expect(mockRefreshTimeRange).not.toHaveBeenCalled();
     jest.advanceTimersByTime(1000);
-    await tick();
+    await wait();
     expect(mockRefreshTimeRange).not.toHaveBeenCalled();
   });
 });

x-pack/legacy/plugins/apm/public/components/shared/useDelayedVisibility/Delayed/index.ts

@@ -57,4 +57,10 @@ export class Delayed {
   public onChange(onChangeCallback: Callback) {
     this.onChangeCallback = onChangeCallback;
   }
+
+  public destroy() {
+    if (this.timeoutId) {
+      window.clearTimeout(this.timeoutId);
+    }
+  }
 }

x-pack/legacy/plugins/apm/public/components/shared/useDelayedVisibility/index.test.tsx

@@ -4,11 +4,16 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { renderHook } from '@testing-library/react-hooks';
+import {
+  renderHook,
+  act,
+  RenderHookResult
+} from '@testing-library/react-hooks';
 import { useDelayedVisibility } from '.';
 
 describe('useFetcher', () => {
-  let hook;
+  let hook: RenderHookResult<any, any>;
+
   beforeEach(() => {
     jest.useFakeTimers();
   });
@@ -26,9 +31,15 @@ describe('useFetcher', () => {
     });
 
     hook.rerender(true);
-    jest.advanceTimersByTime(10);
+    act(() => {
+      jest.advanceTimersByTime(10);
+    });
+
     expect(hook.result.current).toEqual(false);
-    jest.advanceTimersByTime(50);
+    act(() => {
+      jest.advanceTimersByTime(50);
+    });
+
     expect(hook.result.current).toEqual(true);
   });
 
@@ -38,8 +49,11 @@ describe('useFetcher', () => {
     });
 
     hook.rerender(true);
-    jest.advanceTimersByTime(100);
+    act(() => {
+      jest.advanceTimersByTime(100);
+    });
     hook.rerender(false);
+
     expect(hook.result.current).toEqual(true);
   });
 
@@ -49,11 +63,22 @@ describe('useFetcher', () => {
     });
 
     hook.rerender(true);
-    jest.advanceTimersByTime(100);
+
+    act(() => {
+      jest.advanceTimersByTime(100);
+    });
+
     hook.rerender(false);
-    jest.advanceTimersByTime(900);
+    act(() => {
+      jest.advanceTimersByTime(900);
+    });
+
     expect(hook.result.current).toEqual(true);
-    jest.advanceTimersByTime(100);
+
+    act(() => {
+      jest.advanceTimersByTime(100);
+    });
+
     expect(hook.result.current).toEqual(false);
   });
 });

x-pack/legacy/plugins/apm/public/components/shared/useDelayedVisibility/index.ts

@@ -26,6 +26,10 @@ export function useDelayedVisibility(
       setIsVisible(visibility);
     });
     delayedRef.current = delayed;
+
+    return () => {
+      delayed.destroy();
+    };
   }, [hideDelayMs, showDelayMs, minimumVisibleDuration]);
 
   useEffect(() => {

x-pack/legacy/plugins/apm/public/context/UrlParamsContext/__tests__/UrlParamsContext.test.tsx

@@ -11,8 +11,8 @@ import { Location, History } from 'history';
 import { MemoryRouter, Router } from 'react-router-dom';
 import moment from 'moment-timezone';
 import { IUrlParams } from '../types';
-import { tick } from '../../../utils/testHelpers';
 import { getParsedDate } from '../helpers';
+import { wait } from '@testing-library/react';
 
 function mountParams(location: Location) {
   return mount(
@@ -143,13 +143,13 @@ describe('UrlParamsContext', () => {
       </Router>
     );
 
-    await tick();
+    await wait();
 
     expect(calls.length).toBe(1);
 
     wrapper.find('button').simulate('click');
 
-    await tick();
+    await wait();
 
     expect(calls.length).toBe(2);
 
@@ -194,11 +194,11 @@ describe('UrlParamsContext', () => {
       </Router>
     );
 
-    await tick();
+    await wait();
 
     wrapper.find('button').simulate('click');
 
-    await tick();
+    await wait();
 
     const params = getDataFromOutput(wrapper);
     expect(params.start).toEqual('2000-06-14T00:00:00.000Z');

x-pack/legacy/plugins/apm/public/hooks/useFetcher.integration.test.tsx

@@ -5,8 +5,8 @@
  */
 
 import React from 'react';
-import { render } from '@testing-library/react';
-import { delay, tick } from '../utils/testHelpers';
+import { render, wait } from '@testing-library/react';
+import { delay } from '../utils/testHelpers';
 import { useFetcher } from './useFetcher';
 import { KibanaCoreContext } from '../../../observability/public/context/kibana_core';
 import { LegacyCoreStart } from 'kibana/public';
@@ -76,7 +76,8 @@ describe('when simulating race condition', () => {
 
   it('should render "Hello from Peter" after 200ms', async () => {
     jest.advanceTimersByTime(200);
-    await tick();
+
+    await wait();
 
     expect(renderSpy).lastCalledWith({
       data: 'Hello from Peter',
@@ -87,7 +88,7 @@ describe('when simulating race condition', () => {
 
   it('should render "Hello from Peter" after 600ms', async () => {
     jest.advanceTimersByTime(600);
-    await tick();
+    await wait();
 
     expect(renderSpy).lastCalledWith({
       data: 'Hello from Peter',
@@ -98,7 +99,7 @@ describe('when simulating race condition', () => {
 
   it('should should NOT have rendered "Hello from John" at any point', async () => {
     jest.advanceTimersByTime(600);
-    await tick();
+    await wait();
 
     expect(renderSpy).not.toHaveBeenCalledWith({
       data: 'Hello from John',
@@ -109,7 +110,7 @@ describe('when simulating race condition', () => {
 
   it('should send and receive calls in the right order', async () => {
     jest.advanceTimersByTime(600);
-    await tick();
+    await wait();
 
     expect(requestCallOrder).toEqual([
       ['request', 'John', 500],

x-pack/legacy/plugins/apm/public/utils/testHelpers.tsx

@@ -58,7 +58,6 @@ export async function getRenderedHref(Component: React.FC, location: Location) {
     </MemoryRouter>
   );
 
-  await tick();
   await waitForElement(() => el.container.querySelector('a'));
 
   const a = el.container.querySelector('a');
@@ -74,9 +73,6 @@ export function delay(ms: number) {
   return new Promise(resolve => setTimeout(resolve, ms));
 }
 
-// Await this when you need to "flush" promises to immediately resolve or throw in tests
-export const tick = () => new Promise(resolve => setImmediate(resolve, 0));
-
 export function expectTextsNotInDocument(output: any, texts: string[]) {
   texts.forEach(text => {
     try {