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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { vi, describe, expect, it, beforeEach, afterEach } from 'vitest';
import { readStdin } from './readStdin.js';
// Mock process.stdin
const mockStdin = {
setEncoding: vi.fn(),
read: vi.fn(),
on: vi.fn(),
removeListener: vi.fn(),
destroy: vi.fn(),
};
describe('readStdin', () => {
let originalStdin: typeof process.stdin;
let onReadableHandler: () => void;
let onEndHandler: () => void;
beforeEach(() => {
vi.clearAllMocks();
originalStdin = process.stdin;
// Replace process.stdin with our mock
Object.defineProperty(process, 'stdin', {
value: mockStdin,
writable: true,
configurable: true,
});
// Capture event handlers
mockStdin.on.mockImplementation((event: string, handler: () => void) => {
if (event === 'readable') onReadableHandler = handler;
if (event === 'end') onEndHandler = handler;
});
});
afterEach(() => {
vi.restoreAllMocks();
Object.defineProperty(process, 'stdin', {
value: originalStdin,
writable: true,
configurable: true,
});
});
it('should read and accumulate data from stdin', async () => {
mockStdin.read
.mockReturnValueOnce('I love ')
.mockReturnValueOnce('Gemini!')
.mockReturnValueOnce(null);
const promise = readStdin();
// Trigger readable event
onReadableHandler();
// Trigger end to resolve
onEndHandler();
await expect(promise).resolves.toBe('I love Gemini!');
});
it('should handle empty stdin input', async () => {
mockStdin.read.mockReturnValue(null);
const promise = readStdin();
// Trigger end immediately
onEndHandler();
await expect(promise).resolves.toBe('');
});
// Emulate terminals where stdin is not TTY (eg: git bash)
it('should timeout and resolve with empty string when no input is available', async () => {
vi.useFakeTimers();
const promise = readStdin();
// Fast-forward past the timeout (to run test faster)
vi.advanceTimersByTime(500);
await expect(promise).resolves.toBe('');
vi.useRealTimers();
});
it('should clear timeout once when data is received and resolve with data', async () => {
const clearTimeoutSpy = vi.spyOn(global, 'clearTimeout');
mockStdin.read
.mockReturnValueOnce('chunk1')
.mockReturnValueOnce('chunk2')
.mockReturnValueOnce(null);
const promise = readStdin();
// Trigger readable event
onReadableHandler();
expect(clearTimeoutSpy).toHaveBeenCalledOnce();
// Trigger end to resolve
onEndHandler();
await expect(promise).resolves.toBe('chunk1chunk2');
});
});
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