add jest support

jest/setup.js

@@ -1,6 +1,7 @@
 import 'setimmediate';
 import 'react-native-gesture-handler/jestSetup';
 import * as reanimatedJestUtils from 'react-native-reanimated/src/reanimated2/jestUtils';
+import mockClipboard from '@react-native-clipboard/clipboard/jest/clipboard-mock';
 import setupMockImages from './setupMockImages';
 
 setupMockImages();
@@ -10,6 +11,10 @@ reanimatedJestUtils.setUpTests();
 // https://reactnavigation.org/docs/testing/#mocking-native-modules
 jest.mock('react-native/Libraries/Animated/NativeAnimatedHelper');
 
+// Clipboard requires mocking as NativeEmitter will be undefined with jest-runner.
+// https://github.com/react-native-clipboard/clipboard#mocking-clipboard
+jest.mock('@react-native-clipboard/clipboard', () => mockClipboard);
+
 // Mock react-native-onyx storage layer because the SQLite storage layer doesn't work in jest.
 // Mocking this file in __mocks__ does not work because jest doesn't support mocking files that are not directly used in the testing project,
 // and we only want to mock the storage layer, not the whole Onyx module.