Revert "test: Ignore React 18 legacy root deprecation warnings (#929)"

This reverts commit c1878a9.

Author: eps1lon

Diff for: src/__tests__/cleanup.js

@@ -83,10 +83,7 @@ describe('fake timers and missing act warnings', () => {
     expect(microTaskSpy).toHaveBeenCalledTimes(0)
     // console.error is mocked
     // eslint-disable-next-line no-console
-    expect(console.error).toHaveBeenCalledTimes(
-      // ReactDOM.render is deprecated in React 18
-      React.version.startsWith('18') ? 1 : 0,
-    )
+    expect(console.error).toHaveBeenCalledTimes(0)
   })
 
   test('cleanup does not swallow missing act warnings', () => {
@@ -118,16 +115,10 @@ describe('fake timers and missing act warnings', () => {
     expect(deferredStateUpdateSpy).toHaveBeenCalledTimes(1)
     // console.error is mocked
     // eslint-disable-next-line no-console
-    expect(console.error).toHaveBeenCalledTimes(
-      // ReactDOM.render is deprecated in React 18
-      React.version.startsWith('18') ? 2 : 1,
-    )
+    expect(console.error).toHaveBeenCalledTimes(1)
     // eslint-disable-next-line no-console
-    expect(
-      console.error.mock.calls[
-        // ReactDOM.render is deprecated in React 18
-        React.version.startsWith('18') ? 1 : 0
-      ][0],
-    ).toMatch('a test was not wrapped in act(...)')
+    expect(console.error.mock.calls[0][0]).toMatch(
+      'a test was not wrapped in act(...)',
+    )
   })
 })

Diff for: src/__tests__/new-act.js

@@ -1,4 +1,4 @@
-let asyncAct, consoleErrorMock
+let asyncAct
 
 jest.mock('react-dom/test-utils', () => ({
   act: cb => {
@@ -9,11 +9,11 @@ jest.mock('react-dom/test-utils', () => ({
 beforeEach(() => {
   jest.resetModules()
   asyncAct = require('../act-compat').asyncAct
-  consoleErrorMock = jest.spyOn(console, 'error').mockImplementation(() => {})
+  jest.spyOn(console, 'error').mockImplementation(() => {})
 })
 
 afterEach(() => {
-  consoleErrorMock.mockRestore()
+  console.error.mockRestore()
 })
 
 test('async act works when it does not exist (older versions of react)', async () => {

Diff for: src/__tests__/old-act.js

@@ -1,13 +1,13 @@
-let asyncAct, consoleErrorMock
+let asyncAct
 
 beforeEach(() => {
   jest.resetModules()
   asyncAct = require('../act-compat').asyncAct
-  consoleErrorMock = jest.spyOn(console, 'error').mockImplementation(() => {})
+  jest.spyOn(console, 'error').mockImplementation(() => {})
 })
 
 afterEach(() => {
-  consoleErrorMock.mockRestore()
+  console.error.mockRestore()
 })
 
 jest.mock('react-dom/test-utils', () => ({

Diff for: src/__tests__/stopwatch.js

@@ -53,8 +53,5 @@ test('unmounts a component', async () => {
   // and get an error.
   await sleep(5)
   // eslint-disable-next-line no-console
-  expect(console.error).toHaveBeenCalledTimes(
-    // ReactDOM.render is deprecated in React 18
-    React.version.startsWith('18') ? 1 : 0,
-  )
+  expect(console.error).not.toHaveBeenCalled()
 })

Diff for: tests/setup-env.js

@@ -1,24 +1,5 @@
 import '@testing-library/jest-dom/extend-expect'
 
-let consoleErrorMock
-
-beforeEach(() => {
-  const originalConsoleError = console.error
-  consoleErrorMock = jest
-    .spyOn(console, 'error')
-    .mockImplementation((message, ...optionalParams) => {
-      // Ignore ReactDOM.render/ReactDOM.hydrate deprecation warning
-      if (message.indexOf('Use createRoot instead.') !== -1) {
-        return
-      }
-      originalConsoleError(message, ...optionalParams)
-    })
-})
-
-afterEach(() => {
-  consoleErrorMock.mockRestore()
-})
-
 // TODO: Can be removed in a future React release: https://github.com/reactwg/react-18/discussions/23#discussioncomment-798952
 // eslint-disable-next-line import/no-extraneous-dependencies -- need the version from React not an explicitly declared one
 jest.mock('scheduler', () => require('scheduler/unstable_mock'))