[Demo] Tanstack db demo update

demos/react-supabase-todolist-tanstackdb/e2e/mocks/GuardBySync.tsx

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+import { FC, ReactNode } from 'react';
+
+/**
+ * Mock GuardBySync that always renders children immediately.
+ * Bypasses the sync check for testing purposes.
+ */
+export const GuardBySync: FC<{ children: ReactNode; priority?: number }> = ({ children }) => {
+  // Always render children - skip the sync check
+  return <>{children}</>;
+};

demos/react-supabase-todolist-tanstackdb/e2e/mocks/SupabaseConnector.ts

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+import {
+  AbstractPowerSyncDatabase,
+  BaseObserver,
+  PowerSyncBackendConnector,
+  type PowerSyncCredentials
+} from '@powersync/web';
+
+// Mock user ID for testing
+export const MOCK_USER_ID = 'test-user-123';
+
+export type SupabaseConfig = {
+  supabaseUrl: string;
+  supabaseAnonKey: string;
+  powersyncUrl: string;
+};
+
+// Mock Session type matching Supabase's Session
+type MockSession = {
+  access_token: string;
+  refresh_token: string;
+  expires_in: number;
+  expires_at: number;
+  token_type: string;
+  user: {
+    id: string;
+    email: string;
+    aud: string;
+    role: string;
+    created_at: string;
+  };
+};
+
+export type SupabaseConnectorListener = {
+  initialized: () => void;
+  sessionStarted: (session: MockSession) => void;
+};
+
+/**
+ * Mock SupabaseConnector for testing.
+ * Simulates an authenticated session without requiring actual Supabase credentials.
+ */
+export class SupabaseConnector extends BaseObserver<SupabaseConnectorListener> implements PowerSyncBackendConnector {
+  readonly client: MockSupabaseClient;
+  readonly config: SupabaseConfig;
+
+  ready: boolean;
+  currentSession: MockSession | null;
+
+  constructor() {
+    super();
+    this.config = {
+      supabaseUrl: 'https://mock.supabase.test',
+      powersyncUrl: 'https://mock.powersync.test',
+      supabaseAnonKey: 'mock-anon-key'
+    };
+
+    this.client = new MockSupabaseClient();
+
+    // Pre-authenticated session
+    this.currentSession = createMockSession();
+    this.ready = false;
+  }
+
+  async init() {
+    if (this.ready) {
+      return;
+    }
+
+    // Simulate session being loaded
+    this.ready = true;
+    this.iterateListeners((cb) => cb.initialized?.());
+
+    // Trigger session started since we're pre-authenticated
+    if (this.currentSession) {
+      this.iterateListeners((cb) => cb.sessionStarted?.(this.currentSession!));
+    }
+  }
+
+  async login(_username: string, _password: string) {
+    // Mock login - always succeeds
+    this.currentSession = createMockSession();
+    this.updateSession(this.currentSession);
+  }
+
+  async fetchCredentials(): Promise<PowerSyncCredentials> {
+    // Return mock credentials
+    return {
+      endpoint: this.config.powersyncUrl,
+      token: this.currentSession?.access_token ?? 'mock-token'
+    };
+  }
+
+  async uploadData(_database: AbstractPowerSyncDatabase): Promise<void> {
+    // Mock upload - do nothing
+  }
+
+  updateSession(session: MockSession | null) {
+    this.currentSession = session;
+    if (session) {
+      this.iterateListeners((cb) => cb.sessionStarted?.(session));
+    }
+  }
+}
+
+/**
+ * Creates a mock authenticated session
+ */
+function createMockSession(): MockSession {
+  return {
+    access_token: 'mock-access-token',
+    refresh_token: 'mock-refresh-token',
+    expires_in: 3600,
+    expires_at: Math.floor(Date.now() / 1000) + 3600,
+    token_type: 'bearer',
+    user: {
+      id: MOCK_USER_ID,
+      email: 'test@example.com',
+      aud: 'authenticated',
+      role: 'authenticated',
+      created_at: new Date().toISOString()
+    }
+  };
+}
+
+/**
+ * Mock Supabase client for testing
+ */
+class MockSupabaseClient {
+  auth = {
+    getSession: async () => ({
+      data: { session: createMockSession() },
+      error: null
+    }),
+    signInWithPassword: async (_credentials: { email: string; password: string }) => ({
+      data: { session: createMockSession() },
+      error: null
+    }),
+    signOut: async () => ({ error: null }),
+    onAuthStateChange: (_callback: (event: string, session: MockSession | null) => void) => {
+      return { data: { subscription: { unsubscribe: () => {} } } };
+    }
+  };
+
+  from(_table: string) {
+    return {
+      upsert: async (_record: unknown) => ({ error: null }),
+      update: (_data: unknown) => ({
+        eq: async (_column: string, _value: unknown) => ({ error: null })
+      }),
+      delete: () => ({
+        eq: async (_column: string, _value: unknown) => ({ error: null })
+      })
+    };
+  }
+}

demos/react-supabase-todolist-tanstackdb/e2e/test-setup.tsx

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+// Re-export MOCK_USER_ID from the mock
+export { MOCK_USER_ID } from './mocks/SupabaseConnector';
+
+/**
+ * Sets up the test DOM structure matching the app's index.html
+ */
+export function setupTestDOM() {
+  document.body.innerHTML = `
+    <div id="app"></div>
+  `;
+  return document.getElementById('app')!;
+}

demos/react-supabase-todolist-tanstackdb/e2e/todo-lists.test.tsx

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+import { screen, waitFor } from '@testing-library/react';
+import { act } from 'react';
+import { Root, createRoot } from 'react-dom/client';
+import { afterEach, beforeEach, describe, expect, it } from 'vitest';
+import { App } from '../src/app/App';
+import { MOCK_USER_ID, setupTestDOM } from './test-setup';
+
+// Get access to the PowerSync database instance exposed on window
+declare global {
+  interface Window {
+    _powersync: import('@powersync/web').PowerSyncDatabase;
+  }
+}
+
+describe('TodoLists E2E', () => {
+  let root: Root | null = null;
+  let container: HTMLElement;
+
+  beforeEach(async () => {
+    // Set up DOM
+    container = setupTestDOM();
+    await renderAppAndWaitForTodoListsScreen();
+  });
+
+  afterEach(async () => {
+    // Cleanup
+    if (root) {
+      root.unmount();
+      root = null;
+    }
+
+    // Clean up the PowerSync database if it exists
+    if (window._powersync) {
+      try {
+        await window._powersync.disconnectAndClear();
+      } catch (e) {
+        // Ignore errors during cleanup
+      }
+    }
+  });
+
+  /**
+   * Helper to render app and wait for the Todo Lists screen to appear
+   */
+  async function renderAppAndWaitForTodoListsScreen() {
+    await act(async () => {
+      root = createRoot(container);
+      root.render(<App />);
+    });
+
+    // Wait for PowerSync to be initialized
+    await waitFor(
+      () => {
+        expect(window._powersync).toBeDefined();
+      },
+      { timeout: 10000 }
+    );
+
+    // Wait for the Todo Lists screen to appear (app auto-navigates when authenticated)
+    await waitFor(
+      () => {
+        expect(screen.getByText('Todo Lists')).toBeTruthy();
+      },
+      { timeout: 10000 }
+    );
+  }
+
+  /**
+   * Helper to insert a list and wait for it to appear
+   */
+  async function insertList(name: string) {
+    const listId = crypto.randomUUID();
+
+    await act(async () => {
+      await window._powersync.execute(`INSERT INTO lists (id, name, owner_id, created_at) VALUES (?, ?, ?, ?)`, [
+        listId,
+        name,
+        MOCK_USER_ID,
+        new Date().toISOString()
+      ]);
+    });
+
+    return listId;
+  }
+
+  /**
+   * Helper to insert a todo
+   */
+  async function insertTodo(listId: string, description: string, completed: boolean = false) {
+    const todoId = crypto.randomUUID();
+
+    await act(async () => {
+      await window._powersync.execute(
+        `INSERT INTO todos (id, list_id, description, created_by, created_at, completed, completed_at, completed_by) VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+        [
+          todoId,
+          listId,
+          description,
+          MOCK_USER_ID,
+          new Date().toISOString(),
+          completed ? 1 : 0,
+          completed ? new Date().toISOString() : null,
+          completed ? MOCK_USER_ID : null
+        ]
+      );
+    });
+
+    return todoId;
+  }
+
+  it('should load the app and show the Todo Lists screen', async () => {
+    // Verify we're on the Todo Lists page
+    expect(screen.getByText('Todo Lists')).toBeTruthy();
+  });
+
+  it('should display a list widget after inserting a list via PowerSync SQL', async () => {
+    const listName = 'My Shopping List';
+    await insertList(listName);
+
+    // Wait for the list widget to render with our list name
+    await waitFor(
+      () => {
+        expect(screen.getByText(listName)).toBeTruthy();
+      },
+      { timeout: 10000 }
+    );
+
+    // Verify action buttons are present
+    expect(screen.getByRole('button', { name: /delete/i })).toBeTruthy();
+    expect(screen.getByRole('button', { name: /proceed/i })).toBeTruthy();
+  });
+
+  it('should display multiple list widgets after inserting multiple lists', async () => {
+    // Insert multiple lists
+    await insertList('Groceries');
+    await insertList('Work Tasks');
+    await insertList('Personal Goals');
+
+    // Wait for all list widgets to render
+    await waitFor(
+      () => {
+        expect(screen.getByText('Groceries')).toBeTruthy();
+        expect(screen.getByText('Work Tasks')).toBeTruthy();
+        expect(screen.getByText('Personal Goals')).toBeTruthy();
+      },
+      { timeout: 10000 }
+    );
+
+    // Verify we have 3 delete buttons (one per list)
+    const deleteButtons = screen.getAllByRole('button', { name: /delete/i });
+    expect(deleteButtons).toHaveLength(3);
+  });
+
+  it('should display list with correct todo counts (pending and completed)', async () => {
+    const listName = 'My Task List';
+    const listId = await insertList(listName);
+
+    // Insert todos - 2 incomplete, 1 completed
+    await insertTodo(listId, 'Buy groceries', false);
+    await insertTodo(listId, 'Call mom', false);
+    await insertTodo(listId, 'Finish report', true);
+
+    // Wait for the list widget to render with correct stats
+    await waitFor(
+      () => {
+        expect(screen.getByText(listName)).toBeTruthy();
+        // Should show "2 pending, 1 completed" in the description
+        expect(screen.getByText(/2 pending/i)).toBeTruthy();
+        expect(screen.getByText(/1 completed/i)).toBeTruthy();
+      },
+      { timeout: 10000 }
+    );
+  });
+
+  it('should render list widgets with delete and navigate action buttons', async () => {
+    const listName = 'Test List';
+    await insertList(listName);
+
+    // Wait for the list widget with action buttons
+    await waitFor(
+      () => {
+        expect(screen.getByText(listName)).toBeTruthy();
+        expect(screen.getByRole('button', { name: /delete/i })).toBeTruthy();
+        expect(screen.getByRole('button', { name: /proceed/i })).toBeTruthy();
+      },
+      { timeout: 10000 }
+    );
+  });
+
+  it('should display the floating action button to add new lists', async () => {
+    // The FAB should be present - find by class
+    const fab = document.querySelector('.MuiFab-root');
+    expect(fab).not.toBeNull();
+  });
+});