1 files changed, 289 insertions, 0 deletions
diff --git a/packages/cli/src/ui/App.test.tsx b/packages/cli/src/ui/App.test.tsx
new file mode 100644
index 00000000..a7811f6a
--- /dev/null
+++ b/packages/cli/src/ui/App.test.tsx
@@ -0,0 +1,289 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, vi, beforeEach, afterEach, Mock } from 'vitest';
+import { render } from 'ink-testing-library';
+import { App } from './App.js';
+import { Config as ServerConfig, MCPServerConfig } from '@gemini-code/core';
+import type { ToolRegistry } from '@gemini-code/core';
+import { LoadedSettings, SettingsFile, Settings } from '../config/settings.js';
+
+// Define a more complete mock server config based on actual Config
+interface MockServerConfig {
+  apiKey: string;
+  model: string;
+  sandbox: boolean | string;
+  targetDir: string;
+  debugMode: boolean;
+  question?: string;
+  fullContext: boolean;
+  coreTools?: string[];
+  toolDiscoveryCommand?: string;
+  toolCallCommand?: string;
+  mcpServerCommand?: string;
+  mcpServers?: Record<string, MCPServerConfig>; // Use imported MCPServerConfig
+  userAgent: string;
+  userMemory: string;
+  geminiMdFileCount: number;
+  alwaysSkipModificationConfirmation: boolean;
+  vertexai?: boolean;
+  showMemoryUsage?: boolean;
+
+  getApiKey: Mock<() => string>;
+  getModel: Mock<() => string>;
+  getSandbox: Mock<() => boolean | string>;
+  getTargetDir: Mock<() => string>;
+  getToolRegistry: Mock<() => ToolRegistry>; // Use imported ToolRegistry type
+  getDebugMode: Mock<() => boolean>;
+  getQuestion: Mock<() => string | undefined>;
+  getFullContext: Mock<() => boolean>;
+  getCoreTools: Mock<() => string[] | undefined>;
+  getToolDiscoveryCommand: Mock<() => string | undefined>;
+  getToolCallCommand: Mock<() => string | undefined>;
+  getMcpServerCommand: Mock<() => string | undefined>;
+  getMcpServers: Mock<() => Record<string, MCPServerConfig> | undefined>;
+  getUserAgent: Mock<() => string>;
+  getUserMemory: Mock<() => string>;
+  setUserMemory: Mock<(newUserMemory: string) => void>;
+  getGeminiMdFileCount: Mock<() => number>;
+  setGeminiMdFileCount: Mock<(count: number) => void>;
+  getAlwaysSkipModificationConfirmation: Mock<() => boolean>;
+  setAlwaysSkipModificationConfirmation: Mock<(skip: boolean) => void>;
+  getVertexAI: Mock<() => boolean | undefined>;
+  getShowMemoryUsage: Mock<() => boolean>;
+}
+
+// Mock @gemini-code/core and its Config class
+vi.mock('@gemini-code/core', async (importOriginal) => {
+  const actualCore = await importOriginal<typeof import('@gemini-code/core')>();
+  const ConfigClassMock = vi
+    .fn()
+    .mockImplementation((optionsPassedToConstructor) => {
+      const opts = { ...optionsPassedToConstructor }; // Clone
+      // Basic mock structure, will be extended by the instance in tests
+      return {
+        apiKey: opts.apiKey || 'test-key',
+        model: opts.model || 'test-model-in-mock-factory',
+        sandbox: typeof opts.sandbox === 'boolean' ? opts.sandbox : false,
+        targetDir: opts.targetDir || '/test/dir',
+        debugMode: opts.debugMode || false,
+        question: opts.question,
+        fullContext: opts.fullContext ?? false,
+        coreTools: opts.coreTools,
+        toolDiscoveryCommand: opts.toolDiscoveryCommand,
+        toolCallCommand: opts.toolCallCommand,
+        mcpServerCommand: opts.mcpServerCommand,
+        mcpServers: opts.mcpServers,
+        userAgent: opts.userAgent || 'test-agent',
+        userMemory: opts.userMemory || '',
+        geminiMdFileCount: opts.geminiMdFileCount || 0,
+        alwaysSkipModificationConfirmation:
+          opts.alwaysSkipModificationConfirmation ?? false,
+        vertexai: opts.vertexai,
+        showMemoryUsage: opts.showMemoryUsage ?? false,
+
+        getApiKey: vi.fn(() => opts.apiKey || 'test-key'),
+        getModel: vi.fn(() => opts.model || 'test-model-in-mock-factory'),
+        getSandbox: vi.fn(() =>
+          typeof opts.sandbox === 'boolean' ? opts.sandbox : false,
+        ),
+        getTargetDir: vi.fn(() => opts.targetDir || '/test/dir'),
+        getToolRegistry: vi.fn(() => ({}) as ToolRegistry), // Simple mock
+        getDebugMode: vi.fn(() => opts.debugMode || false),
+        getQuestion: vi.fn(() => opts.question),
+        getFullContext: vi.fn(() => opts.fullContext ?? false),
+        getCoreTools: vi.fn(() => opts.coreTools),
+        getToolDiscoveryCommand: vi.fn(() => opts.toolDiscoveryCommand),
+        getToolCallCommand: vi.fn(() => opts.toolCallCommand),
+        getMcpServerCommand: vi.fn(() => opts.mcpServerCommand),
+        getMcpServers: vi.fn(() => opts.mcpServers),
+        getUserAgent: vi.fn(() => opts.userAgent || 'test-agent'),
+        getUserMemory: vi.fn(() => opts.userMemory || ''),
+        setUserMemory: vi.fn(),
+        getGeminiMdFileCount: vi.fn(() => opts.geminiMdFileCount || 0),
+        setGeminiMdFileCount: vi.fn(),
+        getAlwaysSkipModificationConfirmation: vi.fn(
+          () => opts.alwaysSkipModificationConfirmation ?? false,
+        ),
+        setAlwaysSkipModificationConfirmation: vi.fn(),
+        getVertexAI: vi.fn(() => opts.vertexai),
+        getShowMemoryUsage: vi.fn(() => opts.showMemoryUsage ?? false),
+      };
+    });
+  return {
+    ...actualCore,
+    Config: ConfigClassMock,
+    MCPServerConfig: actualCore.MCPServerConfig,
+  };
+});
+
+// Mock heavy dependencies or those with side effects
+vi.mock('./hooks/useGeminiStream', () => ({
+  useGeminiStream: vi.fn(() => ({
+    streamingState: 'Idle',
+    submitQuery: vi.fn(),
+    initError: null,
+    pendingHistoryItems: [],
+  })),
+}));
+
+vi.mock('./hooks/useLogger', () => ({
+  useLogger: vi.fn(() => ({
+    getPreviousUserMessages: vi.fn().mockResolvedValue([]),
+  })),
+}));
+
+vi.mock('../config/config.js', async (importOriginal) => {
+  const actual = await importOriginal();
+  return {
+    // @ts-expect-error - this is fine
+    ...actual,
+    loadHierarchicalGeminiMemory: vi
+      .fn()
+      .mockResolvedValue({ memoryContent: '', fileCount: 0 }),
+  };
+});
+
+describe('App UI', () => {
+  let mockConfig: MockServerConfig;
+  let mockSettings: LoadedSettings;
+  let currentUnmount: (() => void) | undefined;
+
+  const createMockSettings = (
+    settings: Partial<Settings> = {},
+  ): LoadedSettings => {
+    const userSettingsFile: SettingsFile = {
+      path: '/user/settings.json',
+      settings: {},
+    };
+    const workspaceSettingsFile: SettingsFile = {
+      path: '/workspace/.gemini/settings.json',
+      settings,
+    };
+    return new LoadedSettings(userSettingsFile, workspaceSettingsFile);
+  };
+
+  beforeEach(() => {
+    const ServerConfigMocked = vi.mocked(ServerConfig, true);
+    mockConfig = new ServerConfigMocked({
+      apiKey: 'test-key',
+      model: 'test-model-in-options',
+      sandbox: false,
+      targetDir: '/test/dir',
+      debugMode: false,
+      userAgent: 'test-agent',
+      userMemory: '',
+      geminiMdFileCount: 0,
+      showMemoryUsage: false,
+      // Provide other required fields for ConfigParameters if necessary
+    }) as unknown as MockServerConfig;
+
+    // Ensure the getShowMemoryUsage mock function is specifically set up if not covered by constructor mock
+    if (!mockConfig.getShowMemoryUsage) {
+      mockConfig.getShowMemoryUsage = vi.fn(() => false);
+    }
+    mockConfig.getShowMemoryUsage.mockReturnValue(false); // Default for most tests
+
+    mockSettings = createMockSettings();
+  });
+
+  afterEach(() => {
+    if (currentUnmount) {
+      currentUnmount();
+      currentUnmount = undefined;
+    }
+    vi.clearAllMocks(); // Clear mocks after each test
+  });
+
+  it('should display default "GEMINI.md" in footer when contextFileName is not set and count is 1', async () => {
+    mockConfig.getGeminiMdFileCount.mockReturnValue(1);
+    // For this test, ensure showMemoryUsage is false or debugMode is false if it relies on that
+    mockConfig.getDebugMode.mockReturnValue(false);
+    mockConfig.getShowMemoryUsage.mockReturnValue(false);
+
+    const { lastFrame, unmount } = render(
+      <App
+        config={mockConfig as unknown as ServerConfig}
+        settings={mockSettings}
+        cliVersion="1.0.0"
+      />,
+    );
+    currentUnmount = unmount;
+    await Promise.resolve(); // Wait for any async updates
+    expect(lastFrame()).toContain('Using 1 GEMINI.md file');
+  });
+
+  it('should display default "GEMINI.md" with plural when contextFileName is not set and count is > 1', async () => {
+    mockConfig.getGeminiMdFileCount.mockReturnValue(2);
+    mockConfig.getDebugMode.mockReturnValue(false);
+    mockConfig.getShowMemoryUsage.mockReturnValue(false);
+
+    const { lastFrame, unmount } = render(
+      <App
+        config={mockConfig as unknown as ServerConfig}
+        settings={mockSettings}
+        cliVersion="1.0.0"
+      />,
+    );
+    currentUnmount = unmount;
+    await Promise.resolve();
+    expect(lastFrame()).toContain('Using 2 GEMINI.md files');
+  });
+
+  it('should display custom contextFileName in footer when set and count is 1', async () => {
+    mockSettings = createMockSettings({ contextFileName: 'AGENTS.MD' });
+    mockConfig.getGeminiMdFileCount.mockReturnValue(1);
+    mockConfig.getDebugMode.mockReturnValue(false);
+    mockConfig.getShowMemoryUsage.mockReturnValue(false);
+
+    const { lastFrame, unmount } = render(
+      <App
+        config={mockConfig as unknown as ServerConfig}
+        settings={mockSettings}
+        cliVersion="1.0.0"
+      />,
+    );
+    currentUnmount = unmount;
+    await Promise.resolve();
+    expect(lastFrame()).toContain('Using 1 AGENTS.MD file');
+  });
+
+  it('should display custom contextFileName with plural when set and count is > 1', async () => {
+    mockSettings = createMockSettings({ contextFileName: 'MY_NOTES.TXT' });
+    mockConfig.getGeminiMdFileCount.mockReturnValue(3);
+    mockConfig.getDebugMode.mockReturnValue(false);
+    mockConfig.getShowMemoryUsage.mockReturnValue(false);
+
+    const { lastFrame, unmount } = render(
+      <App
+        config={mockConfig as unknown as ServerConfig}
+        settings={mockSettings}
+        cliVersion="1.0.0"
+      />,
+    );
+    currentUnmount = unmount;
+    await Promise.resolve();
+    expect(lastFrame()).toContain('Using 3 MY_NOTES.TXT files');
+  });
+
+  it('should not display context file message if count is 0, even if contextFileName is set', async () => {
+    mockSettings = createMockSettings({ contextFileName: 'ANY_FILE.MD' });
+    mockConfig.getGeminiMdFileCount.mockReturnValue(0);
+    mockConfig.getDebugMode.mockReturnValue(false);
+    mockConfig.getShowMemoryUsage.mockReturnValue(false);
+
+    const { lastFrame, unmount } = render(
+      <App
+        config={mockConfig as unknown as ServerConfig}
+        settings={mockSettings}
+        cliVersion="1.0.0"
+      />,
+    );
+    currentUnmount = unmount;
+    await Promise.resolve();
+    expect(lastFrame()).not.toContain('ANY_FILE.MD');
+  });
+});