feat: Initial clean release of CHM

packages/app-mobile/utils/appReducer.test.ts

@@ -0,0 +1,68 @@
+import appReducer from './appReducer';
+import appDefaultState, { DEFAULT_ROUTE } from './appDefaultState';
+import Folder from '@joplin/lib/models/Folder';
+
+const notesRoute = { type: 'NAV_GO', routeName: 'Notes', folderId: 'folder1' };
+const settingsRoute = { type: 'NAV_GO', routeName: 'Config' };
+const deletedFolderId = 'folder1';
+
+const clearHistory = () => appReducer(appDefaultState, { type: 'NAV_GO', routeName: 'Notes', clearHistory: true });
+
+// Simulates the exact scenario: navigate to a folder with no prior history, then delete it
+const makeDeletedRouteWithEmptyHistory = () => {
+	let state = appReducer(appDefaultState, {
+		type: 'NAV_GO',
+		routeName: 'Notes',
+		folderId: deletedFolderId,
+		clearHistory: true,
+	});
+	state = appReducer(state, { type: 'FOLDER_DELETE', id: deletedFolderId });
+	return state;
+};
+
+describe('appReducer', () => {
+	test('historyCanGoBack is true after navigating from Notes to Settings', () => {
+		let state = clearHistory();
+		state = appReducer(state, notesRoute);
+		state = appReducer(state, settingsRoute);
+		expect(state.historyCanGoBack).toBe(true);
+	});
+
+	test('historyCanGoBack remains true after navigating away from a deleted route', () => {
+		let state = makeDeletedRouteWithEmptyHistory();
+
+		// Navigate forward (e.g. open Settings)
+		state = appReducer(state, settingsRoute);
+
+		expect(state.historyCanGoBack).toBe(true);
+	});
+
+	test('going back from Settings after folder deletion lands on DEFAULT_ROUTE', () => {
+		let state = makeDeletedRouteWithEmptyHistory();
+		state = appReducer(state, settingsRoute);
+
+		// Go back
+		state = appReducer(state, { type: 'NAV_BACK' });
+
+		expect(state.route).toEqual(DEFAULT_ROUTE);
+	});
+
+	test('removes the conflicts folder from navigation when it disappears', () => {
+		const conflictFolderId = Folder.conflictFolderId();
+		let state = appReducer({
+			...appDefaultState,
+			folders: [{ ...Folder.conflictFolder(), id: conflictFolderId }],
+		}, {
+			type: 'NAV_GO',
+			routeName: 'Notes',
+			folderId: conflictFolderId,
+			clearHistory: true,
+		});
+
+		state = appReducer(state, { type: 'FOLDER_UPDATE_ALL', items: [] });
+		state = appReducer(state, settingsRoute);
+		state = appReducer(state, { type: 'NAV_BACK' });
+
+		expect(state.route).toEqual(DEFAULT_ROUTE);
+	});
+});