Refac: Centralize storage file management (#4078)

Co-authored-by: Taylor Mullen <ntaylormullen@google.com>

packages/core/src/config/storage.test.ts

@@ -0,0 +1,55 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, vi } from 'vitest';
+import * as os from 'os';
+import * as path from 'node:path';
+
+vi.mock('fs', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('fs')>();
+  return {
+    ...actual,
+    mkdirSync: vi.fn(),
+  };
+});
+
+import { Storage } from './storage.js';
+
+describe('Storage – getGlobalSettingsPath', () => {
+  it('returns path to ~/.gemini/settings.json', () => {
+    const expected = path.join(os.homedir(), '.gemini', 'settings.json');
+    expect(Storage.getGlobalSettingsPath()).toBe(expected);
+  });
+});
+
+describe('Storage – additional helpers', () => {
+  const projectRoot = '/tmp/project';
+  const storage = new Storage(projectRoot);
+
+  it('getWorkspaceSettingsPath returns project/.gemini/settings.json', () => {
+    const expected = path.join(projectRoot, '.gemini', 'settings.json');
+    expect(storage.getWorkspaceSettingsPath()).toBe(expected);
+  });
+
+  it('getUserCommandsDir returns ~/.gemini/commands', () => {
+    const expected = path.join(os.homedir(), '.gemini', 'commands');
+    expect(Storage.getUserCommandsDir()).toBe(expected);
+  });
+
+  it('getProjectCommandsDir returns project/.gemini/commands', () => {
+    const expected = path.join(projectRoot, '.gemini', 'commands');
+    expect(storage.getProjectCommandsDir()).toBe(expected);
+  });
+
+  it('getMcpOAuthTokensPath returns ~/.gemini/mcp-oauth-tokens.json', () => {
+    const expected = path.join(
+      os.homedir(),
+      '.gemini',
+      'mcp-oauth-tokens.json',
+    );
+    expect(Storage.getMcpOAuthTokensPath()).toBe(expected);
+  });
+});