test(infrastructure): add unit tests for background services and handlers

tests/unit/background-auth-handlers.test.ts

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+/**
+ * Test scaffolding for background authentication handlers.
+ * Addresses Issue #105: no test files exist for background handler modules.
+ * Addresses Issue #40: establishes coverage baseline for auth boundary.
+ *
+ * These tests exercise the AUTH_INITIATE, AUTH_STATUS, AUTH_LOGOUT, and
+ * OFFSCREEN_TOKEN_REFRESH handlers registered in src/background/index.ts
+ * by importing the module (which registers handlers on the MessageBus)
+ * and invoking them through the chrome.runtime.onMessage listener.
+ */
+
+import { StorageService } from '../../src/services/storage';
+import { SalesforceAuth } from '../../src/services/salesforce/auth';
+import type { ExtensionMessage, MessageResponse } from '../../src/core/types/messaging';
+import type { SalesforceOrg } from '../../src/core/types/salesforce';
+
+// Import background module to register handlers on the MessageBus.
+// The module creates singleton service instances and registers all
+// messageBus.on() handlers at import time.
+import '../../src/background/index';
+
+const mockOrg: SalesforceOrg = {
+  id: '00Dxx0000000001',
+  orgId: '00Dxx0000000001',
+  instanceUrl: 'https://test.my.salesforce.com',
+  environment: 'sandbox',
+  username: 'test@example.com',
+  displayName: 'Test User',
+  accessToken: 'mock-access-token',
+  tokenExpiresAt: Date.now() + 7200000,
+  apiVersion: 'v65.0',
+  connectedAt: Date.now(),
+  lastUsedAt: Date.now(),
+};
+
+function makeMessage<T>(type: string, payload: T): ExtensionMessage {
+  return {
+    type: type as ExtensionMessage['type'],
+    payload: payload as ExtensionMessage['payload'],
+    requestId: `req-${Date.now()}`,
+    timestamp: Date.now(),
+    source: 'popup',
+  };
+}
+
+function getRegisteredHandler(type: string) {
+  // The MessageBus registers listeners via chrome.runtime.onMessage.addListener.
+  // We capture the listener from the mock and invoke it directly.
+  const listeners = (chrome.runtime.onMessage.addListener as jest.Mock).mock.calls;
+  // The last registered listener is the background handler (singleton MessageBus).
+  const listener = listeners[listeners.length - 1]?.[0];
+  if (!listener) throw new Error(`No listener registered for ${type}`);
+
+  return async (message: ExtensionMessage): Promise<MessageResponse> => {
+    return new Promise((resolve) => {
+      const result = listener(message, {}, resolve);
+      // If the handler returns false or undefined synchronously, it was not handled.
+      if (result === false || result === undefined) {
+        resolve({ success: false, error: { code: 'NOT_HANDLED', message: 'No handler' }, requestId: message.requestId });
+      }
+    });
+  };
+}
+
+describe('Background Auth Handlers', () => {
+  let storage: StorageService;
+
+  beforeEach(async () => {
+    await chrome.storage.local.clear();
+    await chrome.storage.session.clear();
+    jest.restoreAllMocks();
+    storage = new StorageService();
+  });
+
+  describe('AUTH_STATUS', () => {
+    it('returns authenticated: false when no active org exists', async () => {
+      const handler = getRegisteredHandler('AUTH_STATUS');
+      const message = makeMessage('AUTH_STATUS', {});
+      const response = await handler(message);
+
+      expect(response.success).toBe(true);
+      expect(response.data).toEqual({ authenticated: false });
+    });
+
+    it('returns authenticated: true with org data when active org exists and token is valid', async () => {
+      await storage.saveOrg(mockOrg);
+      await storage.setActiveOrgId(mockOrg.orgId);
+
+      jest.spyOn(SalesforceAuth.prototype, 'ensureValidToken').mockResolvedValue(mockOrg);
+
+      const handler = getRegisteredHandler('AUTH_STATUS');
+      const message = makeMessage('AUTH_STATUS', {});
+      const response = await handler(message);
+
+      expect(response.success).toBe(true);
+      expect(response.data).toEqual({
+        authenticated: true,
+        org: {
+          orgId: mockOrg.orgId,
+          username: mockOrg.username,
+          instanceUrl: mockOrg.instanceUrl,
+        },
+      });
+    });
+
+    it('returns error when auth status check throws', async () => {
+      await storage.saveOrg(mockOrg);
+      await storage.setActiveOrgId(mockOrg.orgId);
+
+      jest.spyOn(SalesforceAuth.prototype, 'ensureValidToken').mockRejectedValue(new Error('Network failure'));
+
+      const handler = getRegisteredHandler('AUTH_STATUS');
+      const message = makeMessage('AUTH_STATUS', {});
+      const response = await handler(message);
+
+      expect(response.success).toBe(false);
+      expect(response.error?.code).toBe('AUTH_STATUS_ERROR');
+    });
+  });
+
+  describe('AUTH_LOGOUT', () => {
+    it('removes stored org and returns success', async () => {
+      await storage.saveOrg(mockOrg);
+      await storage.setActiveOrgId(mockOrg.orgId);
+
+      const handler = getRegisteredHandler('AUTH_LOGOUT');
+      const message = makeMessage('AUTH_LOGOUT', { orgId: mockOrg.orgId });
+      const response = await handler(message);
+
+      expect(response.success).toBe(true);
+      const storedOrg = await storage.getOrg(mockOrg.orgId);
+      expect(storedOrg).toBeUndefined();
+    });
+
+    it('succeeds even when org does not exist', async () => {
+      const handler = getRegisteredHandler('AUTH_LOGOUT');
+      const message = makeMessage('AUTH_LOGOUT', { orgId: 'nonexistent' });
+      const response = await handler(message);
+
+      expect(response.success).toBe(true);
+    });
+  });
+
+  describe('OFFSCREEN_TOKEN_REFRESH', () => {
+    it('returns refreshed token for known orgId', async () => {
+      await storage.saveOrg(mockOrg);
+      await storage.setActiveOrgId(mockOrg.orgId);
+
+      const refreshedOrg = { ...mockOrg, accessToken: 'refreshed-token' };
+      jest.spyOn(SalesforceAuth.prototype, 'ensureValidToken').mockResolvedValue(refreshedOrg);
+
+      const handler = getRegisteredHandler('OFFSCREEN_TOKEN_REFRESH');
+      const message = makeMessage('OFFSCREEN_TOKEN_REFRESH', { orgId: mockOrg.orgId });
+      const response = await handler(message);
+
+      expect(response.success).toBe(true);
+      expect(response.data).toEqual({ accessToken: 'refreshed-token' });
+    });
+
+    it('returns error when orgId is unknown and no instanceUrl provided', async () => {
+      const handler = getRegisteredHandler('OFFSCREEN_TOKEN_REFRESH');
+      const message = makeMessage('OFFSCREEN_TOKEN_REFRESH', {});
+      const response = await handler(message);
+
+      expect(response.success).toBe(false);
+      expect(response.error?.code).toBe('TOKEN_REFRESH_FAILED');
+    });
+  });
+});

tests/unit/background-services.test.ts

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+/**
+ * Test scaffolding for background service modules (MessageBus, SalesforceAuth).
+ * Addresses Issue #105: no test files exist for service modules used by background handlers.
+ * Addresses Issue #40: establishes coverage baseline for service layer boundaries.
+ *
+ * These tests exercise the MessageBus messaging abstraction and SalesforceAuth
+ * cookie-based authentication in isolation, without requiring the full background
+ * handler registration.
+ */
+
+import { MessageBus } from '../../src/services/messaging';
+import { SalesforceAuth } from '../../src/services/salesforce/auth';
+import type { ExtensionMessage, MessageResponse } from '../../src/core/types/messaging';
+
+describe('MessageBus', () => {
+  let bus: MessageBus;
+
+  beforeEach(() => {
+    jest.restoreAllMocks();
+    bus = new MessageBus('background');
+  });
+
+  afterEach(() => {
+    bus.destroy();
+  });
+
+  it('registers and invokes a handler for a message type', async () => {
+    const handler = jest.fn(async (message: ExtensionMessage): Promise<MessageResponse> => ({
+      success: true,
+      data: { echo: message.payload },
+      requestId: message.requestId,
+    }));
+
+    bus.on('UI_SETTINGS_GET', handler);
+
+    // Simulate an incoming message through the chrome.runtime.onMessage listener
+    const listeners = (chrome.runtime.onMessage.addListener as jest.Mock).mock.calls;
+    const listener = listeners[listeners.length - 1]?.[0];
+    expect(listener).toBeDefined();
+
+    const message: ExtensionMessage = {
+      type: 'UI_SETTINGS_GET',
+      payload: {},
+      requestId: 'req-test-1',
+      timestamp: Date.now(),
+      source: 'popup',
+    };
+
+    const response = await new Promise<MessageResponse>((resolve) => {
+      listener(message, {}, resolve);
+    });
+
+    expect(handler).toHaveBeenCalledTimes(1);
+    expect(response.success).toBe(true);
+  });
+
+  it('returns false for unhandled message types', () => {
+    const listeners = (chrome.runtime.onMessage.addListener as jest.Mock).mock.calls;
+    const listener = listeners[listeners.length - 1]?.[0];
+
+    const message: ExtensionMessage = {
+      type: 'UI_SETTINGS_GET',
+      payload: {},
+      requestId: 'req-test-2',
+      timestamp: Date.now(),
+      source: 'popup',
+    };
+
+    const sendResponse = jest.fn();
+    const result = listener(message, {}, sendResponse);
+
+    // No handler registered, should return false
+    expect(result).toBe(false);
+    expect(sendResponse).not.toHaveBeenCalled();
+  });
+
+  it('removes a handler with off()', async () => {
+    const handler = jest.fn(async (): Promise<MessageResponse> => ({
+      success: true,
+      requestId: 'req-test-3',
+    }));
+
+    bus.on('UI_SETTINGS_GET', handler);
+    bus.off('UI_SETTINGS_GET');
+
+    const listeners = (chrome.runtime.onMessage.addListener as jest.Mock).mock.calls;
+    const listener = listeners[listeners.length - 1]?.[0];
+
+    const message: ExtensionMessage = {
+      type: 'UI_SETTINGS_GET',
+      payload: {},
+      requestId: 'req-test-3',
+      timestamp: Date.now(),
+      source: 'popup',
+    };
+
+    const sendResponse = jest.fn();
+    const result = listener(message, {}, sendResponse);
+
+    expect(result).toBe(false);
+    expect(handler).not.toHaveBeenCalled();
+  });
+
+  it('handles handler errors gracefully', async () => {
+    bus.on('UI_SETTINGS_GET', async (): Promise<MessageResponse> => {
+      throw new Error('Handler exploded');
+    });
+
+    const listeners = (chrome.runtime.onMessage.addListener as jest.Mock).mock.calls;
+    const listener = listeners[listeners.length - 1]?.[0];
+
+    const message: ExtensionMessage = {
+      type: 'UI_SETTINGS_GET',
+      payload: {},
+      requestId: 'req-test-4',
+      timestamp: Date.now(),
+      source: 'popup',
+    };
+
+    const response = await new Promise<MessageResponse>((resolve) => {
+      listener(message, {}, resolve);
+    });
+
+    expect(response.success).toBe(false);
+    expect(response.error?.message).toContain('Handler exploded');
+  });
+
+  it('broadcast sends to runtime and all tabs', () => {
+    bus.broadcast('DATA_PUSH_PROGRESS', {
+      pushId: 'push-1',
+      processedRecords: 5,
+      totalRecords: 10,
+      status: 'processing',
+    });
+
+    expect(chrome.runtime.sendMessage).toHaveBeenCalled();
+    expect(chrome.tabs.query).toHaveBeenCalledWith({}, expect.any(Function));
+  });
+});
+
+describe('SalesforceAuth', () => {
+  let auth: SalesforceAuth;
+
+  beforeEach(() => {
+    jest.restoreAllMocks();
+    auth = new SalesforceAuth();
+  });
+
+  describe('isTokenExpired', () => {
+    it('returns false when token is well within TTL', () => {
+      const org = {
+        id: '00D',
+        orgId: '00D',
+        instanceUrl: 'https://test.my.salesforce.com',
+        environment: 'sandbox' as const,
+        username: 'user@test.com',
+        displayName: 'User',
+        accessToken: 'token',
+        tokenExpiresAt: Date.now() + 3600000, // 1 hour from now
+        apiVersion: 'v65.0' as const,
+        connectedAt: Date.now(),
+        lastUsedAt: Date.now(),
+      };
+
+      expect(auth.isTokenExpired(org)).toBe(false);
+    });
+
+    it('returns true when token is past expiry minus buffer', () => {
+      const org = {
+        id: '00D',
+        orgId: '00D',
+        instanceUrl: 'https://test.my.salesforce.com',
+        environment: 'sandbox' as const,
+        username: 'user@test.com',
+        displayName: 'User',
+        accessToken: 'token',
+        tokenExpiresAt: Date.now() - 1000, // already expired
+        apiVersion: 'v65.0' as const,
+        connectedAt: Date.now(),
+        lastUsedAt: Date.now(),
+      };
+
+      expect(auth.isTokenExpired(org)).toBe(true);
+    });
+  });
+
+  describe('login', () => {
+    it('throws AuthError when no Salesforce tab is open', async () => {
+      (chrome.tabs.query as jest.Mock).mockImplementation(
+        (_queryInfo: unknown, callback: (tabs: unknown[]) => void) => {
+          callback([]);
+        },
+      );
+
+      await expect(auth.login()).rejects.toThrow(/Open an authenticated Salesforce tab/);
+    });
+  });
+
+  describe('logout', () => {
+    it('resolves without error (no-op disconnect)', async () => {
+      const org = {
+        id: '00D',
+        orgId: '00D',
+        instanceUrl: 'https://test.my.salesforce.com',
+        environment: 'sandbox' as const,
+        username: 'user@test.com',
+        displayName: 'User',
+        accessToken: 'token',
+        tokenExpiresAt: Date.now() + 3600000,
+        apiVersion: 'v65.0' as const,
+        connectedAt: Date.now(),
+        lastUsedAt: Date.now(),
+      };
+
+      await expect(auth.logout(org)).resolves.toBeUndefined();
+    });
+  });
+});