[React18] Migrate test suites to account for testing library upgrades…

… obs-ux-infra_services-team (elastic#201168) This PR migrates test suites that use `renderHook` from the library `@testing-library/react-hooks` to adopt the equivalent and replacement of `renderHook` from the export that is now available from `@testing-library/react`. This work is required for the planned migration to react18. ## Context In this PR, usages of `waitForNextUpdate` that previously could have been destructured from `renderHook` are now been replaced with `waitFor` exported from `@testing-library/react`, furthermore `waitFor` that would also have been destructured from the same renderHook result is now been replaced with `waitFor` from the export of `@testing-library/react`. ***Why is `waitFor` a sufficient enough replacement for `waitForNextUpdate`, and better for testing values subject to async computations?*** WaitFor will retry the provided callback if an error is returned, till the configured timeout elapses. By default the retry interval is `50ms` with a timeout value of `1000ms` that effectively translates to at least 20 retries for assertions placed within waitFor. See https://testing-library.com/docs/dom-testing-library/api-async/#waitfor for more information. This however means that for person's writing tests, said person has to be explicit about expectations that describe the internal state of the hook being tested. This implies checking for instance when a react query hook is being rendered, there's an assertion that said hook isn't loading anymore. In this PR you'd notice that this pattern has been adopted, with most existing assertions following an invocation of `waitForNextUpdate` being placed within a `waitFor` invocation. In some cases the replacement is simply a `waitFor(() => new Promise((resolve) => resolve(null)))` (many thanks to @kapral18, for point out exactly why this works), where this suffices the assertions that follow aren't placed within a waitFor so this PR doesn't get larger than it needs to be. It's also worth pointing out this PR might also contain changes to test and application code to improve said existing test. ### What to do next? 1. Review the changes in this PR. 2. If you think the changes are correct, approve the PR. ## Any questions? If you have any questions or need help with this PR, please leave comments in this PR. --------- Co-authored-by: Elastic Machine <[email protected]>
xcrzx · Nov 25, 2024 · 691f493 · 691f493
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diff --git a/...tion/apm/public/components/app/correlations/use_failed_transactions_correlations.test.tsx b/...tion/apm/public/components/app/correlations/use_failed_transactions_correlations.test.tsx
@@ -5,10 +5,11 @@
  * 2.0.
  */
 
-import React, { ReactNode } from 'react';
+import React, { PropsWithChildren } from 'react';
 import { merge } from 'lodash';
 import { createMemoryHistory } from 'history';
-import { renderHook, act } from '@testing-library/react-hooks';
+
+import { act, waitFor, renderHook } from '@testing-library/react';
 
 import { ApmPluginContextValue } from '../../../context/apm_plugin/apm_plugin_context';
 import {
@@ -22,7 +23,7 @@ import { fromQuery } from '../../shared/links/url_helpers';
 import { useFailedTransactionsCorrelations } from './use_failed_transactions_correlations';
 import type { APIEndpoint } from '../../../../server';
 
-function wrapper({ children, error = false }: { children?: ReactNode; error: boolean }) {
+function wrapper({ children, error = false }: PropsWithChildren<{ error?: boolean }>) {
   const getHttpMethodMock = (method: 'GET' | 'POST') =>
     jest.fn().mockImplementation(async (pathname) => {
       await delay(100);
@@ -107,39 +108,40 @@ describe('useFailedTransactionsCorrelations', () => {
         wrapper,
       });
 
-      try {
+      await waitFor(() =>
         expect(result.current.progress).toEqual({
           isRunning: true,
           loaded: 0,
-        });
-        expect(result.current.response).toEqual({ ccsWarning: false });
-        expect(typeof result.current.startFetch).toEqual('function');
-        expect(typeof result.current.cancelFetch).toEqual('function');
-      } finally {
-        unmount();
-      }
+        })
+      );
+
+      expect(result.current.response).toEqual({ ccsWarning: false });
+      expect(result.current.startFetch).toEqual(expect.any(Function));
+      expect(result.current.cancelFetch).toEqual(expect.any(Function));
+
+      unmount();
     });
 
     it('should not have received any results after 50ms', async () => {
       const { result, unmount } = renderHook(() => useFailedTransactionsCorrelations(), {
         wrapper,
       });
 
-      try {
-        jest.advanceTimersByTime(50);
+      jest.advanceTimersByTime(50);
 
+      await waitFor(() =>
         expect(result.current.progress).toEqual({
           isRunning: true,
           loaded: 0,
-        });
-        expect(result.current.response).toEqual({ ccsWarning: false });
-      } finally {
-        unmount();
-      }
+        })
+      );
+
+      expect(result.current.response).toEqual({ ccsWarning: false });
+      unmount();
     });
 
     it('should receive partial updates and finish running', async () => {
-      const { result, unmount, waitFor } = renderHook(() => useFailedTransactionsCorrelations(), {
+      const { result, unmount } = renderHook(() => useFailedTransactionsCorrelations(), {
         wrapper,
       });
 
@@ -253,29 +255,37 @@ describe('useFailedTransactionsCorrelations', () => {
   });
   describe('when throwing an error', () => {
     it('should automatically start fetching results', async () => {
-      const { result, unmount } = renderHook(() => useFailedTransactionsCorrelations(), {
-        wrapper,
-        initialProps: {
-          error: true,
-        },
+      const { result, unmount } = renderHook(useFailedTransactionsCorrelations, {
+        wrapper: ({ children }) =>
+          React.createElement(
+            wrapper,
+            {
+              error: true,
+            },
+            children
+          ),
       });
 
-      try {
+      await waitFor(() =>
         expect(result.current.progress).toEqual({
           isRunning: true,
           loaded: 0,
-        });
-      } finally {
-        unmount();
-      }
+        })
+      );
+
+      unmount();
     });
 
     it('should still be running after 50ms', async () => {
-      const { result, unmount } = renderHook(() => useFailedTransactionsCorrelations(), {
-        wrapper,
-        initialProps: {
-          error: true,
-        },
+      const { result, unmount } = renderHook(useFailedTransactionsCorrelations, {
+        wrapper: ({ children }) =>
+          React.createElement(
+            wrapper,
+            {
+              error: true,
+            },
+            children
+          ),
       });
 
       try {
@@ -292,11 +302,15 @@ describe('useFailedTransactionsCorrelations', () => {
     });
 
     it('should stop and return an error after more than 100ms', async () => {
-      const { result, unmount, waitFor } = renderHook(() => useFailedTransactionsCorrelations(), {
-        wrapper,
-        initialProps: {
-          error: true,
-        },
+      const { result, unmount } = renderHook(useFailedTransactionsCorrelations, {
+        wrapper: ({ children }) =>
+          React.createElement(
+            wrapper,
+            {
+              error: true,
+            },
+            children
+          ),
       });
 
       try {
@@ -316,7 +330,7 @@ describe('useFailedTransactionsCorrelations', () => {
 
   describe('when canceled', () => {
     it('should stop running', async () => {
-      const { result, unmount, waitFor } = renderHook(() => useFailedTransactionsCorrelations(), {
+      const { result, unmount } = renderHook(() => useFailedTransactionsCorrelations(), {
         wrapper,
       });
 

diff --git a/...ability_solution/apm/public/components/app/correlations/use_latency_correlations.test.tsx b/...ability_solution/apm/public/components/app/correlations/use_latency_correlations.test.tsx
@@ -5,10 +5,11 @@
  * 2.0.
  */
 
-import React, { ReactNode } from 'react';
+import React, { PropsWithChildren } from 'react';
 import { merge } from 'lodash';
 import { createMemoryHistory } from 'history';
-import { renderHook, act } from '@testing-library/react-hooks';
+
+import { act, waitFor, renderHook } from '@testing-library/react';
 
 import { ApmPluginContextValue } from '../../../context/apm_plugin/apm_plugin_context';
 import {
@@ -22,7 +23,7 @@ import { fromQuery } from '../../shared/links/url_helpers';
 import { useLatencyCorrelations } from './use_latency_correlations';
 import type { APIEndpoint } from '../../../../server';
 
-function wrapper({ children, error = false }: { children?: ReactNode; error: boolean }) {
+function wrapper({ children, error = false }: PropsWithChildren<{ error?: boolean }>) {
   const getHttpMethodMock = (method: 'GET' | 'POST') =>
     jest.fn().mockImplementation(async (pathname) => {
       await delay(100);
@@ -86,16 +87,17 @@ function wrapper({ children, error = false }: { children?: ReactNode; error: boo
 }
 
 describe('useLatencyCorrelations', () => {
-  beforeEach(async () => {
-    jest.useFakeTimers({ legacyFakeTimers: true });
-  });
-  afterEach(() => {
-    jest.useRealTimers();
-  });
-
   describe('when successfully loading results', () => {
+    beforeEach(() => {
+      jest.useFakeTimers();
+    });
+
+    afterEach(() => {
+      jest.useRealTimers();
+    });
+
     it('should automatically start fetching results', async () => {
-      const { result, unmount } = renderHook(() => useLatencyCorrelations(), {
+      const { result, unmount } = renderHook(useLatencyCorrelations, {
         wrapper,
       });
 
@@ -113,7 +115,7 @@ describe('useLatencyCorrelations', () => {
     });
 
     it('should not have received any results after 50ms', async () => {
-      const { result, unmount } = renderHook(() => useLatencyCorrelations(), {
+      const { result, unmount } = renderHook(useLatencyCorrelations, {
         wrapper,
       });
 
@@ -131,7 +133,7 @@ describe('useLatencyCorrelations', () => {
     });
 
     it('should receive partial updates and finish running', async () => {
-      const { result, unmount, waitFor } = renderHook(() => useLatencyCorrelations(), {
+      const { result, unmount } = renderHook(useLatencyCorrelations, {
         wrapper,
       });
 
@@ -213,12 +215,17 @@ describe('useLatencyCorrelations', () => {
   });
 
   describe('when throwing an error', () => {
+    beforeEach(() => {
+      jest.useFakeTimers();
+    });
+
+    afterEach(() => {
+      jest.useRealTimers();
+    });
+
     it('should automatically start fetching results', async () => {
-      const { result, unmount } = renderHook(() => useLatencyCorrelations(), {
-        wrapper,
-        initialProps: {
-          error: true,
-        },
+      const { result, unmount } = renderHook(useLatencyCorrelations, {
+        wrapper: ({ children }) => wrapper({ children, error: true }),
       });
 
       try {
@@ -232,11 +239,8 @@ describe('useLatencyCorrelations', () => {
     });
 
     it('should still be running after 50ms', async () => {
-      const { result, unmount } = renderHook(() => useLatencyCorrelations(), {
-        wrapper,
-        initialProps: {
-          error: true,
-        },
+      const { result, unmount } = renderHook(useLatencyCorrelations, {
+        wrapper: ({ children }) => wrapper({ children, error: true }),
       });
 
       try {
@@ -253,31 +257,38 @@ describe('useLatencyCorrelations', () => {
     });
 
     it('should stop and return an error after more than 100ms', async () => {
-      const { result, unmount, waitFor } = renderHook(() => useLatencyCorrelations(), {
-        wrapper,
-        initialProps: {
-          error: true,
-        },
+      const { result, unmount } = renderHook(useLatencyCorrelations, {
+        wrapper: ({ children }) => wrapper({ children, error: true }),
       });
 
       try {
-        jest.advanceTimersByTime(150);
-        await waitFor(() => expect(result.current.progress.error).toBeDefined());
-
-        expect(result.current.progress).toEqual({
-          error: 'Something went wrong',
-          isRunning: false,
-          loaded: 0,
+        act(() => {
+          jest.advanceTimersByTime(150);
         });
+        await waitFor(() =>
+          expect(result.current.progress).toEqual({
+            error: 'Something went wrong',
+            isRunning: false,
+            loaded: 0,
+          })
+        );
       } finally {
         unmount();
       }
     });
   });
 
   describe('when canceled', () => {
+    beforeEach(() => {
+      jest.useFakeTimers();
+    });
+
+    afterEach(() => {
+      jest.useRealTimers();
+    });
+
     it('should stop running', async () => {
-      const { result, unmount, waitFor } = renderHook(() => useLatencyCorrelations(), {
+      const { result, unmount } = renderHook(useLatencyCorrelations, {
         wrapper,
       });
 

diff --git a/...ervability_solution/apm/public/components/app/infra_overview/infra_tabs/use_tabs.test.tsx b/...ervability_solution/apm/public/components/app/infra_overview/infra_tabs/use_tabs.test.tsx
@@ -5,7 +5,7 @@
  * 2.0.
  */
 import React, { ReactNode } from 'react';
-import { renderHook } from '@testing-library/react-hooks';
+import { renderHook } from '@testing-library/react';
 import { useTabs } from './use_tabs';
 import { createKibanaReactContext } from '@kbn/kibana-react-plugin/public';
 import { CoreStart } from '@kbn/core/public';

diff --git a/...lugins/observability_solution/apm/public/components/app/service_map/empty_banner.test.tsx b/...lugins/observability_solution/apm/public/components/app/service_map/empty_banner.test.tsx
@@ -58,11 +58,12 @@ describe('EmptyBanner', () => {
     it('does not render null', async () => {
       const component = renderWithTheme(<EmptyBanner />, { wrapper });
 
-      await act(async () => {
+      act(() => {
         cy.add({ data: { id: 'test id' } });
-        await waitFor(() => {
-          expect(component.container.children.length).toBeGreaterThan(0);
-        });
+      });
+
+      await waitFor(() => {
+        expect(component.container.children.length).toBeGreaterThan(0);
       });
     });
   });

diff --git a/...lity_solution/apm/public/components/app/service_map/use_cytoscape_event_handlers.test.tsx b/...lity_solution/apm/public/components/app/service_map/use_cytoscape_event_handlers.test.tsx
@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import { renderHook } from '@testing-library/react-hooks';
+import { renderHook } from '@testing-library/react';
 import cytoscape from 'cytoscape';
 import dagre from 'cytoscape-dagre';
 import { EuiTheme } from '@kbn/kibana-react-plugin/common';

diff --git a/...k/plugins/observability_solution/apm/public/components/app/trace_link/trace_link.test.tsx b/...k/plugins/observability_solution/apm/public/components/app/trace_link/trace_link.test.tsx
@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import { act, render, waitFor } from '@testing-library/react';
+import { render, waitFor } from '@testing-library/react';
 import { shallow } from 'enzyme';
 import React, { ReactNode } from 'react';
 import { MemoryRouter } from 'react-router-dom';
@@ -67,12 +67,9 @@ describe('TraceLink', () => {
       },
     });
 
-    let result;
-    act(() => {
-      const component = render(<TraceLink />, renderOptions);
+    const component = render(<TraceLink />, renderOptions);
 
-      result = component.getByText('Fetching trace...');
-    });
+    const result = component.getByText('Fetching trace...');
     await waitFor(() => {});
     expect(result).toBeDefined();
   });

diff --git a/...y_solution/apm/public/components/routing/templates/apm_service_template/use_tabs.test.tsx b/...y_solution/apm/public/components/routing/templates/apm_service_template/use_tabs.test.tsx
@@ -6,7 +6,7 @@
  */
 import { CoreStart } from '@kbn/core/public';
 import { createKibanaReactContext } from '@kbn/kibana-react-plugin/public';
-import { renderHook } from '@testing-library/react-hooks';
+import { renderHook } from '@testing-library/react';
 import { createMemoryHistory } from 'history';
 import React, { ReactNode } from 'react';
 import { ServerlessType } from '../../../../../common/serverless';

diff --git a/...bility_solution/apm/public/components/shared/charts/timeline/marker/error_marker.test.tsx b/...bility_solution/apm/public/components/shared/charts/timeline/marker/error_marker.test.tsx
@@ -5,8 +5,7 @@
  * 2.0.
  */
 
-import { fireEvent } from '@testing-library/react';
-import { act } from '@testing-library/react-hooks';
+import { fireEvent, act } from '@testing-library/react';
 import React, { ReactNode } from 'react';
 import { MemoryRouter } from 'react-router-dom';
 import { MockApmPluginContextWrapper } from '../../../../../context/apm_plugin/mock_apm_plugin_context';