Chore: Mobile: Improve note screen tests and fix CI warning

[personalizedrefrigerator]

Summary

This pull request improves the mobile note screen tests.

Goal: Simplify writing tests that 1) modify the content of the mobile note editor, then 2) check for a change based on that modification (e.g. note save).

In particular, it:

• Tests repeatedly updating the note title, verifying that the note is indeed saved.
• Tests updating the note body:
  • Adding chunks and checking that they save before the component unmounts.
  • Adding text to the note editor then unmounting the component after a brief delay (see Mobile (testing environment): Last editor input is lost if changes are made less than about 100ms before closing the app #11125).

Note

#11127 can be observed while running the new tests.

[personalizedrefrigerator]

This pull request seems to fix a large number of warnings observed recently in CI:

Related logs from a recent CI run

 Warning: An update to Animated(Pressable) inside a test was not wrapped in act(...).
➤ YN0000: [@joplin/app-mobile]: 
➤ YN0000: [@joplin/app-mobile]: When testing, code that causes React state updates should be wrapped into act(...):
➤ YN0000: [@joplin/app-mobile]: 
➤ YN0000: [@joplin/app-mobile]: act(() => {
➤ YN0000: [@joplin/app-mobile]:   /* fire events that update state */
➤ YN0000: [@joplin/app-mobile]: });
➤ YN0000: [@joplin/app-mobile]: /* assert on the output */
➤ YN0000: [@joplin/app-mobile]: 
➤ YN0000: [@joplin/app-mobile]: This ensures that you're testing the behavior the user would see in the browser. Learn more at https://reactjs.org/link/wrap-tests-with-act
➤ YN0000: [@joplin/app-mobile]:     at /home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/Libraries/Animated/createAnimatedComponent.js:35:59
➤ YN0000: [@joplin/app-mobile]:     at View
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockComponent.js:30:18)
➤ YN0000: [@joplin/app-mobile]:     at actions (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/components/FAB/FABGroup.tsx:203:3)
➤ YN0000: [@joplin/app-mobile]:     at apply (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/@callstack/react-theme-provider/src/createThemeProvider.js:14:3)
➤ YN0000: [@joplin/app-mobile]:     at View
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockComponent.js:30:18)
➤ YN0000: [@joplin/app-mobile]:     at PortalManager (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/components/Portal/PortalManager.tsx:14:35)
➤ YN0000: [@joplin/app-mobile]:     at PortalHost (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/components/Portal/PortalHost.tsx:45:32)
➤ YN0000: [@joplin/app-mobile]:     at RNCSafeAreaProvider
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockNativeComponent.js:17:18)
➤ YN0000: [@joplin/app-mobile]:     at children (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-safe-area-context/src/SafeAreaContext.tsx:35:3)
➤ YN0000: [@joplin/app-mobile]:     at children (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/core/SafeAreaProviderCompat.tsx:38:50)
➤ YN0000: [@joplin/app-mobile]:     at theme (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/core/PaperProvider.tsx:25:11)
➤ YN0000: [@joplin/app-mobile]:     at View
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockComponent.js:30:18)
➤ YN0000: [@joplin/app-mobile]:     at View
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockComponent.js:30:18)
➤ YN0000: [@joplin/app-mobile]:     at _classCallCheck (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-popup-menu/src/MenuProvider.js:28:22)
➤ YN0000: [@joplin/app-mobile]:     at WrappedNoteScreen
➤ YN0000: [@joplin/app-mobile]: Warning: An update to Animated(View) inside a test was not wrapped in act(...).
➤ YN0000: [@joplin/app-mobile]: 
➤ YN0000: [@joplin/app-mobile]: When testing, code that causes React state updates should be wrapped into act(...):
➤ YN0000: [@joplin/app-mobile]: 
➤ YN0000: [@joplin/app-mobile]: act(() => {
➤ YN0000: [@joplin/app-mobile]:   /* fire events that update state */
➤ YN0000: [@joplin/app-mobile]: });
➤ YN0000: [@joplin/app-mobile]: /* assert on the output */
➤ YN0000: [@joplin/app-mobile]: 
➤ YN0000: [@joplin/app-mobile]: This ensures that you're testing the behavior the user would see in the browser. Learn more at https://reactjs.org/link/wrap-tests-with-act
➤ YN0000: [@joplin/app-mobile]:     at /home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/Libraries/Animated/createAnimatedComponent.js:35:59
➤ YN0000: [@joplin/app-mobile]:     at elevation (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/components/Surface.tsx:158:7)
➤ YN0000: [@joplin/app-mobile]:     at elevation (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/components/Surface.tsx:260:7)
➤ YN0000: [@joplin/app-mobile]:     at icon (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/components/FAB/FAB.tsx:185:7)
➤ YN0000: [@joplin/app-mobile]:     at View
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockComponent.js:30:18)
➤ YN0000: [@joplin/app-mobile]:     at View
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockComponent.js:30:18)
➤ YN0000: [@joplin/app-mobile]:     at actions (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/components/FAB/FABGroup.tsx:203:3)
➤ YN0000: [@joplin/app-mobile]:     at apply (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/@callstack/react-theme-provider/src/createThemeProvider.js:14:3)
➤ YN0000: [@joplin/app-mobile]:     at View
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockComponent.js:30:18)
➤ YN0000: [@joplin/app-mobile]:     at PortalManager (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/components/Portal/PortalManager.tsx:14:35)
➤ YN0000: [@joplin/app-mobile]:     at PortalHost (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/components/Portal/PortalHost.tsx:45:32)
➤ YN0000: [@joplin/app-mobile]:     at RNCSafeAreaProvider
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockNativeComponent.js:17:18)
➤ YN0000: [@joplin/app-mobile]:     at children (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-safe-area-context/src/SafeAreaContext.tsx:35:3)
➤ YN0000: [@joplin/app-mobile]:     at children (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/core/SafeAreaProviderCompat.tsx:38:50)
➤ YN0000: [@joplin/app-mobile]:     at theme (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-paper/src/core/PaperProvider.tsx:25:11)
➤ YN0000: [@joplin/app-mobile]:     at View
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockComponent.js:30:18)
➤ YN0000: [@joplin/app-mobile]:     at View
➤ YN0000: [@joplin/app-mobile]:     at Component (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native/jest/mockComponent.js:30:18)
➤ YN0000: [@joplin/app-mobile]:     at _classCallCheck (/home/runner/work/joplin/joplin/packages/app-mobile/node_modules/react-native-popup-menu/src/MenuProvider.js:28:22)
➤ YN0000: [@joplin/app-mobile]:     at WrappedNoteScreen
➤ YN0000: [@joplin/app-mobile]: Warning: An update to Animated(Pressable) inside a test was not wrapped in act(...).