Introduce GEMINI_CLI_HOME for strict test isolation (#15907)

packages/cli/src/ui/themes/theme-manager.test.ts

@@ -27,6 +27,15 @@ vi.mock('node: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(),
+  };
+});
+
 const validCustomTheme: CustomTheme = {
   type: 'custom',
   name: 'MyCustomTheme',

packages/cli/src/ui/themes/theme-manager.ts

@@ -18,7 +18,6 @@ import { ShadesOfPurple } from './shades-of-purple.js';
 import { XCode } from './xcode.js';
 import * as fs from 'node:fs';
 import * as path from 'node:path';
-import * as os from 'node:os';
 import type { Theme, ThemeType, CustomTheme } from './theme.js';
 import { createCustomTheme, validateCustomTheme } from './theme.js';
 import type { SemanticColors } from './semantic-tokens.js';
@@ -26,7 +25,7 @@ import { ANSI } from './ansi.js';
 import { ANSILight } from './ansi-light.js';
 import { NoColorTheme } from './no-color.js';
 import process from 'node:process';
-import { debugLogger } from '@google/gemini-cli-core';
+import { debugLogger, homedir } from '@google/gemini-cli-core';
 
 export interface ThemeDisplay {
   name: string;
@@ -255,7 +254,7 @@ class ThemeManager {
       }
 
       // 2. Perform security check.
-      const homeDir = path.resolve(os.homedir());
+      const homeDir = path.resolve(homedir());
       if (!canonicalPath.startsWith(homeDir)) {
         debugLogger.warn(
           `Theme file at "${themePath}" is outside your home directory. ` +