File size: 5,524 Bytes
7421850 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | /**
* @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';
import { debugLogger } from '@google/gemini-cli-core';
vi.mock('@google/gemini-cli-core', () => ({
debugLogger: {
warn: vi.fn(),
},
}));
// Mock process.stdin
const mockStdin = {
setEncoding: vi.fn(),
read: vi.fn(),
on: vi.fn(),
removeListener: vi.fn(),
destroy: vi.fn(),
listeners: vi.fn().mockReturnValue([]),
listenerCount: vi.fn().mockReturnValue(0),
};
describe('readStdin', () => {
let originalStdin: typeof process.stdin;
let onReadableHandler: () => void;
let onEndHandler: () => void;
let onErrorHandler: (err: Error) => 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: (...args: unknown[]) => void) => {
if (event === 'readable') onReadableHandler = handler as () => void;
if (event === 'end') onEndHandler = handler as () => void;
if (event === 'error') onErrorHandler = handler as (err: Error) => void;
},
);
mockStdin.listeners.mockReturnValue([]);
mockStdin.listenerCount.mockReturnValue(0);
});
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');
});
it('should truncate input if it exceeds MAX_STDIN_SIZE', async () => {
const MAX_STDIN_SIZE = 8 * 1024 * 1024;
const largeChunk = 'a'.repeat(MAX_STDIN_SIZE + 100);
mockStdin.read.mockReturnValueOnce(largeChunk).mockReturnValueOnce(null);
const promise = readStdin();
onReadableHandler();
await expect(promise).resolves.toBe('a'.repeat(MAX_STDIN_SIZE));
expect(debugLogger.warn).toHaveBeenCalledWith(
`Warning: stdin input truncated to ${MAX_STDIN_SIZE} bytes.`,
);
expect(mockStdin.destroy).toHaveBeenCalled();
});
it('should truncate multi-byte characters at byte boundary', async () => {
const MAX_STDIN_SIZE = 8 * 1024 * 1024;
// '한' is 3 bytes. 2,796,202 * 3 = 8,388,606 bytes.
// 2,796,203 * 3 = 8,388,609 bytes.
const charCount = Math.floor(MAX_STDIN_SIZE / 3) + 1;
const multiByteChunk = '한'.repeat(charCount);
mockStdin.read
.mockReturnValueOnce(multiByteChunk)
.mockReturnValueOnce(null);
const promise = readStdin();
onReadableHandler();
const result = await promise;
const resultBytes = Buffer.byteLength(result, 'utf8');
expect(resultBytes).toBeLessThanOrEqual(MAX_STDIN_SIZE);
expect(resultBytes).toBe(Math.floor(MAX_STDIN_SIZE / 3) * 3);
expect(result).not.toContain('\uFFFD'); // No replacement characters
});
it('should use byte length instead of string length for limit', async () => {
const MAX_STDIN_SIZE = 8 * 1024 * 1024;
// '한' is 3 bytes. If we use string length, we'd allow 8M characters = 24MB.
// We want to ensure it stops at 8MB.
const charCount = MAX_STDIN_SIZE; // 8M characters = 24MB
const multiByteChunk = '한'.repeat(charCount);
mockStdin.read
.mockReturnValueOnce(multiByteChunk)
.mockReturnValueOnce(null);
const promise = readStdin();
onReadableHandler();
const result = await promise;
expect(Buffer.byteLength(result, 'utf8')).toBeLessThanOrEqual(
MAX_STDIN_SIZE,
);
expect(result.length).toBeLessThan(charCount);
});
it('should handle stdin error', async () => {
const promise = readStdin();
const error = new Error('stdin error');
onErrorHandler(error);
await expect(promise).rejects.toThrow('stdin error');
});
});
|