FN-6366: fix desktop Vitest constructor mocks

Stabilize the desktop Vitest suite under Vitest 4.1.8 while keeping dashboard builds complete.

- Convert Electron constructor mocks to constructable function implementations for BrowserWindow, Tray, Notification, and LocalRuntimeManager.\n- Assert local runtime initialization uses the mocked home directory in desktop main-process tests.\n- Build dashboard runtime plugin packages before the desktop dashboard build.

Files changed:\n packages/desktop/scripts/workspace-tools.ts        | 15 ++++++++++++++\n packages/desktop/src/__tests__/deep-link.test.ts   |  4 +++-\n .../desktop/src/__tests__/main-integration.test.ts | 23 ++++++++++++++--------\n .../desktop/src/__tests__/main-local-mode.test.ts  | 19 ++++++++++++++----\n .../desktop/src/__tests__/main.integration.test.ts | 21 ++++++++++++--------\n packages/desktop/src/__tests__/main.test.ts        | 13 +++++++++---\n packages/desktop/src/__tests__/native.test.ts      |  6 ++++--\n 7 files changed, 75 insertions(+), 26 deletions(-)

Fusion-Task-Id: FN-6366

Fusion-Task-Lineage: 4e4ccdbc-845f-47d9-a565-cc5d659cf089

packages/desktop/scripts/workspace-tools.ts

@@ -45,8 +45,23 @@ export async function buildCore(): Promise<void> {
   await runWorkspaceBin("tsc", [], resolve(workspaceRoot, "packages", "core"));
 }
 
+async function buildPackage(relativePath: string): Promise<void> {
+  await runWorkspaceBin("tsc", [], resolve(workspaceRoot, relativePath));
+}
+
+export async function buildDashboardRuntimePlugins(): Promise<void> {
+  await buildPackage("packages/plugin-sdk");
+  await Promise.all([
+    buildPackage("plugins/fusion-plugin-dependency-graph"),
+    buildPackage("plugins/fusion-plugin-hermes-runtime"),
+    buildPackage("plugins/fusion-plugin-openclaw-runtime"),
+    buildPackage("plugins/fusion-plugin-paperclip-runtime"),
+  ]);
+}
+
 export async function buildDashboard(): Promise<void> {
   const dashboardRoot = resolve(workspaceRoot, "packages", "dashboard");
+  await buildDashboardRuntimePlugins();
   await runWorkspaceBin("vite", ["build"], dashboardRoot);
   await runWorkspaceBin("tsc", [], dashboardRoot);
 }

packages/desktop/src/__tests__/deep-link.test.ts

@@ -33,7 +33,9 @@ const mocks = vi.hoisted(() => {
 
 vi.mock("electron", () => ({
   app: mocks.app,
-  BrowserWindow: vi.fn(() => mocks.browserWindow),
+  BrowserWindow: vi.fn(function () {
+    return mocks.browserWindow;
+  }),
 }));
 
 async function importDeepLinkModule() {

packages/desktop/src/__tests__/main-integration.test.ts

@@ -44,6 +44,7 @@ const mocks = vi.hoisted(() => {
 
   const app = {
     whenReady: vi.fn(() => Promise.resolve()),
+    getPath: vi.fn((name: string) => (name === "home" ? "/mock/home" : "/mock/other")),
     on: vi.fn((event: string, handler: (...args: unknown[]) => void) => {
       appEvents.set(event, handler);
     }),
@@ -51,14 +52,14 @@ const mocks = vi.hoisted(() => {
     isQuitting: false,
   };
 
-  const BrowserWindow = vi.fn((options: Record<string, unknown>) => {
+  const BrowserWindow = vi.fn(function (options: Record<string, unknown>) {
     callLog.push("createMainWindow");
     const instance = createWindowMock();
     windowInstances.push({ instance, options });
     return instance;
   });
 
-  const Tray = vi.fn(() => {
+  const Tray = vi.fn(function () {
     const tray = createTrayMock();
     trayInstances.push(tray);
     return tray;
@@ -117,6 +118,14 @@ const mocks = vi.hoisted(() => {
   const getStatus = vi.fn(() => ({ source: "none", state: "stopped" }));
 
   const saveWindowState = vi.fn();
+  const LocalRuntimeManager = vi.fn(function () {
+    return {
+      startLocal,
+      stopLocal,
+      getStatus,
+      getServerPort: vi.fn(() => 0),
+    };
+  });
 
   const DEFAULT_WINDOW_STATE = {
     width: 1280,
@@ -149,6 +158,7 @@ const mocks = vi.hoisted(() => {
     startLocal,
     stopLocal,
     getStatus,
+    LocalRuntimeManager,
     DEFAULT_WINDOW_STATE,
   };
 });
@@ -195,12 +205,7 @@ vi.mock("../native.js", () => ({
 }));
 
 vi.mock("../local-runtime.js", () => ({
-  LocalRuntimeManager: vi.fn(() => ({
-    startLocal: mocks.startLocal,
-    stopLocal: mocks.stopLocal,
-    getStatus: mocks.getStatus,
-    getServerPort: vi.fn(() => 0),
-  })),
+  LocalRuntimeManager: mocks.LocalRuntimeManager,
 }));
 
 // Mock renderer module
@@ -268,6 +273,8 @@ describe("main integration", () => {
       "setupAutoUpdater",
       "startUpdateCheckInterval",
     ]);
+    expect(mocks.LocalRuntimeManager).toHaveBeenCalledWith({ rootDir: "/mock/home" });
+    expect(mocks.app.getPath).toHaveBeenCalledWith("home");
   });
 
   it("createMainWindow uses restored window state", async () => {

packages/desktop/src/__tests__/main-local-mode.test.ts

@@ -4,6 +4,7 @@ const mocks = vi.hoisted(() => {
   const appHandlers = new Map<string, (...args: unknown[]) => void>();
   const app = {
     whenReady: vi.fn(async () => undefined),
+    getPath: vi.fn((name: string) => (name === "home" ? "/mock/home" : "/mock/other")),
     on: vi.fn((event: string, handler: (...args: unknown[]) => void) => {
       appHandlers.set(event, handler);
       return app;
@@ -26,8 +27,12 @@ const mocks = vi.hoisted(() => {
     webContents: { send: vi.fn() },
   };
 
-  const BrowserWindow = vi.fn(() => browserWindow);
-  const Tray = vi.fn(() => ({ destroy: vi.fn() }));
+  const BrowserWindow = vi.fn(function () {
+    return browserWindow;
+  });
+  const Tray = vi.fn(function () {
+    return { destroy: vi.fn() };
+  });
 
   const localRuntimeManager = {
     startLocal: vi.fn(async () => ({ source: "embedded-local", state: "running", port: 4041 })),
@@ -40,7 +45,11 @@ const mocks = vi.hoisted(() => {
     getAllDisplays: vi.fn(() => [{ workArea: { x: 0, y: 0, width: 1920, height: 1080 } }]),
   };
 
-  return { app, appHandlers, BrowserWindow, Tray, browserWindow, localRuntimeManager, screen };
+  const LocalRuntimeManager = vi.fn(function () {
+    return localRuntimeManager;
+  });
+
+  return { app, appHandlers, BrowserWindow, Tray, browserWindow, localRuntimeManager, LocalRuntimeManager, screen };
 });
 
 vi.mock("electron", () => ({
@@ -66,7 +75,7 @@ vi.mock("../native.js", () => ({
   clampWindowStateToVisibleDisplay: vi.fn((state) => state),
 }));
 vi.mock("../deep-link.js", () => ({ registerDeepLinkProtocol: vi.fn(), setupDeepLinkHandler: vi.fn() }));
-vi.mock("../local-runtime.js", () => ({ LocalRuntimeManager: vi.fn(() => mocks.localRuntimeManager) }));
+vi.mock("../local-runtime.js", () => ({ LocalRuntimeManager: mocks.LocalRuntimeManager }));
 
 describe("main local mode", () => {
   beforeEach(() => {
@@ -81,6 +90,8 @@ describe("main local mode", () => {
     const { initializeApp } = await import("../main.ts");
     await initializeApp();
 
+    expect(mocks.LocalRuntimeManager).toHaveBeenCalledWith({ rootDir: "/mock/home" });
+    expect(mocks.app.getPath).toHaveBeenCalledWith("home");
     expect(mocks.localRuntimeManager.startLocal).toHaveBeenCalled();
     delete process.env.FUSION_DESKTOP_MODE;
   });

packages/desktop/src/__tests__/main.integration.test.ts

@@ -3,6 +3,7 @@ import { beforeEach, describe, expect, it, vi } from "vitest";
 const mocks = vi.hoisted(() => {
   const app = {
     whenReady: vi.fn(() => Promise.resolve()),
+    getPath: vi.fn((name: string) => (name === "home" ? "/mock/home" : "/mock/other")),
     on: vi.fn(),
     quit: vi.fn(),
   };
@@ -20,14 +21,18 @@ const mocks = vi.hoisted(() => {
 
   return {
     app,
-    BrowserWindow: vi.fn(() => browserWindow),
-    Tray: vi.fn(() => ({
-      destroy: vi.fn(),
-      setImage: vi.fn(),
-      setContextMenu: vi.fn(),
-      setToolTip: vi.fn(),
-      on: vi.fn(),
-    })),
+    BrowserWindow: vi.fn(function () {
+      return browserWindow;
+    }),
+    Tray: vi.fn(function () {
+      return {
+        destroy: vi.fn(),
+        setImage: vi.fn(),
+        setContextMenu: vi.fn(),
+        setToolTip: vi.fn(),
+        on: vi.fn(),
+      };
+    }),
     nativeImage: {
       createEmpty: vi.fn(() => ({ id: "empty-image" })),
     },

packages/desktop/src/__tests__/main.test.ts

@@ -34,7 +34,9 @@ const mocks = vi.hoisted(() => {
     maximize: vi.fn(),
   };
 
-  const BrowserWindow = vi.fn(() => browserWindowInstance) as unknown as {
+  const BrowserWindow = vi.fn(function () {
+    return browserWindowInstance;
+  }) as unknown as {
     (...args: unknown[]): typeof browserWindowInstance;
     getAllWindows: () => unknown[];
   };
@@ -60,7 +62,9 @@ const mocks = vi.hoisted(() => {
     on: vi.fn(),
   };
 
-  const Tray = vi.fn(() => trayInstance);
+  const Tray = vi.fn(function () {
+    return trayInstance;
+  });
   const Menu = {
     buildFromTemplate: vi.fn(() => ({ id: "mock-menu" })),
     setApplicationMenu: vi.fn(),
@@ -133,7 +137,9 @@ const mainDeps = vi.hoisted(() => {
     loadDesktopLaunchMode,
     saveDesktopLaunchMode,
     saveWindowState: vi.fn(),
-    LocalRuntimeManager: vi.fn(() => ({ startLocal, stopLocal, getStatus, getServerPort })),
+    LocalRuntimeManager: vi.fn(function () {
+      return { startLocal, stopLocal, getStatus, getServerPort };
+    }),
     startLocal,
   };
 });
@@ -301,6 +307,7 @@ describe("main process", () => {
 
     await initializeApp();
 
+    expect(mainDeps.LocalRuntimeManager).toHaveBeenCalledWith({ rootDir: "/mock/home" });
     expect(mainDeps.startLocal).toHaveBeenCalledTimes(1);
     expect(getCurrentDesktopLaunchMode()).toBe("local");
   });

packages/desktop/src/__tests__/native.test.ts

@@ -24,7 +24,7 @@ const mocks = vi.hoisted(() => {
     options: Record<string, unknown>;
   }> = [];
 
-  const Notification = vi.fn().mockImplementation((options: Record<string, unknown>) => {
+  const Notification = vi.fn().mockImplementation(function (options: Record<string, unknown>) {
     const listeners = new Map<string, () => void>();
     const instance = {
       show: vi.fn(),
@@ -92,7 +92,9 @@ vi.mock("electron", () => ({
   app: mocks.app,
   dialog: mocks.dialog,
   Notification: mocks.Notification,
-  BrowserWindow: vi.fn(() => mocks.browserWindow),
+  BrowserWindow: vi.fn(function () {
+    return mocks.browserWindow;
+  }),
 }));
 
 vi.mock("electron-updater", () => ({