Introduce GEMINI_CLI_HOME for strict test isolation (#15907)

packages/cli/src/ui/hooks/slashCommandProcessor.test.tsx

@@ -74,6 +74,7 @@ vi.mock('node:process', () => {
     exit: mockProcessExit,
     platform: 'sunos',
     cwd: () => '/fake/dir',
+    env: {},
   } as unknown as NodeJS.Process;
   return {
     ...mockProcess,

packages/cli/src/ui/hooks/useExtensionUpdates.test.tsx

@@ -30,6 +30,15 @@ vi.mock('os', async (importOriginal) => {
   };
 });
 
+vi.mock('@google/gemini-cli-core', async (importOriginal) => {
+  const actual =
+    await importOriginal<typeof import('@google/gemini-cli-core')>();
+  return {
+    ...actual,
+    homedir: () => os.homedir(),
+  };
+});
+
 vi.mock('../../config/extensions/update.js', () => ({
   checkForAllExtensionUpdates: vi.fn(),
   updateExtension: vi.fn(),

packages/cli/src/ui/hooks/usePermissionsModifyTrust.test.ts

@@ -28,9 +28,16 @@ const mockedIsWorkspaceTrusted = vi.hoisted(() => vi.fn());
 const mockedUseSettings = vi.hoisted(() => vi.fn());
 
 // Mock modules
-vi.mock('node:process', () => ({
-  cwd: mockedCwd,
-}));
+vi.mock('node:process', () => {
+  const mockProcess = {
+    cwd: mockedCwd,
+    env: {},
+  };
+  return {
+    ...mockProcess,
+    default: mockProcess,
+  };
+});
 
 vi.mock('node:path', async (importOriginal) => {
   const actual = await importOriginal();