Allow telemetry exporters to GCP to utilize user's login credentials, if requested (#13778)

scripts/tests/generate-settings-doc.test.ts

@@ -4,9 +4,17 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { describe, it, expect } from 'vitest';
+import { describe, it, expect, vi } from 'vitest';
 import { main as generateDocs } from '../generate-settings-doc.ts';
 
+vi.mock('fs', () => ({
+  readFileSync: vi.fn().mockReturnValue(''),
+  createWriteStream: vi.fn(() => ({
+    write: vi.fn(),
+    on: vi.fn(),
+  })),
+}));
+
 describe('generate-settings-doc', () => {
   it('keeps documentation in sync in check mode', async () => {
     const previousExitCode = process.exitCode;

scripts/tests/generate-settings-schema.test.ts

@@ -4,12 +4,21 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { describe, expect, it } from 'vitest';
+import { describe, expect, it, vi } from 'vitest';
 import { readFile } from 'node:fs/promises';
 import { fileURLToPath } from 'node:url';
 import { dirname, join } from 'node:path';
 import { main as generateSchema } from '../generate-settings-schema.ts';
 
+vi.mock('fs', () => ({
+  readFileSync: vi.fn().mockReturnValue(''),
+  writeFileSync: vi.fn(),
+  createWriteStream: vi.fn(() => ({
+    write: vi.fn(),
+    on: vi.fn(),
+  })),
+}));
+
 describe('generate-settings-schema', () => {
   it('keeps schema in sync in check mode', async () => {
     const previousExitCode = process.exitCode;

scripts/tests/telemetry_gcp.test.ts

@@ -0,0 +1,56 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { vi, describe, it, expect, beforeEach, afterEach } from 'vitest';
+
+const mockSpawn = vi.fn(() => ({ on: vi.fn(), pid: 123 }));
+
+vi.mock('node:child_process', () => ({
+  spawn: mockSpawn,
+  execSync: vi.fn(),
+}));
+
+vi.mock('node:fs', () => ({
+  readFileSync: vi.fn(),
+  writeFileSync: vi.fn(),
+  openSync: vi.fn(() => 1),
+  unlinkSync: vi.fn(),
+  mkdirSync: vi.fn(),
+}));
+
+vi.mock('../telemetry_utils.js', () => ({
+  ensureBinary: vi.fn(() => Promise.resolve('/fake/path/to/otelcol-contrib')),
+  waitForPort: vi.fn(() => Promise.resolve()),
+  manageTelemetrySettings: vi.fn(),
+  registerCleanup: vi.fn(),
+  fileExists: vi.fn(() => true), // Assume all files exist for simplicity
+  OTEL_DIR: '/tmp/otel',
+  BIN_DIR: '/tmp/bin',
+}));
+
+describe('telemetry_gcp.js', () => {
+  beforeEach(() => {
+    vi.resetModules(); // This is key to re-run the script
+    vi.clearAllMocks();
+    process.env.OTLP_GOOGLE_CLOUD_PROJECT = 'test-project';
+    // Clear the env var before each test
+    delete process.env.GEMINI_CLI_CREDENTIALS_PATH;
+  });
+
+  afterEach(() => {
+    delete process.env.OTLP_GOOGLE_CLOUD_PROJECT;
+  });
+
+  it('should not set GOOGLE_APPLICATION_CREDENTIALS when env var is not set', async () => {
+    await import('../telemetry_gcp.js');
+
+    expect(mockSpawn).toHaveBeenCalled();
+    const spawnOptions = mockSpawn.mock.calls[0][2];
+    expect(spawnOptions?.env).not.toHaveProperty(
+      'GOOGLE_APPLICATION_CREDENTIALS',
+    );
+  });
+});