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* @license
* Copyright 2026 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import fs from 'node:fs';
import type { ChildProcess } from 'node:child_process';
import { EventEmitter } from 'node:events';
import os from 'node:os';
import path from 'node:path';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { spawn } from 'node:child_process';
import { exitCli } from '../utils.js';
import { getLogFilePath } from './constants.js';
import { logsCommand, readLastLines } from './logs.js';
vi.mock('@google/gemini-cli-core', async (importOriginal) => {
const { mockCoreDebugLogger } = await import(
'../../test-utils/mockDebugLogger.js'
);
return mockCoreDebugLogger(
await importOriginal<typeof import('@google/gemini-cli-core')>(),
{
stripAnsi: false,
},
);
});
vi.mock('node:child_process', async (importOriginal) => {
const actual = await importOriginal<typeof import('node:child_process')>();
return {
...actual,
spawn: vi.fn(),
};
});
vi.mock('../utils.js', () => ({
exitCli: vi.fn(),
}));
vi.mock('./constants.js', () => ({
getLogFilePath: vi.fn(),
}));
function createMockChild(): ChildProcess {
return Object.assign(new EventEmitter(), {
kill: vi.fn(),
}) as unknown as ChildProcess;
}
async function flushMicrotasks() {
await Promise.resolve();
await Promise.resolve();
}
describe('readLastLines', () => {
const tempFiles: string[] = [];
afterEach(async () => {
await Promise.all(
tempFiles
.splice(0)
.map((filePath) => fs.promises.rm(filePath, { force: true })),
);
});
it('returns only the requested tail lines without reading the whole file eagerly', async () => {
const filePath = path.join(
os.tmpdir(),
`gemma-logs-${Date.now()}-${Math.random().toString(36).slice(2)}.log`,
);
tempFiles.push(filePath);
const content = Array.from({ length: 2000 }, (_, i) => `line-${i + 1}`)
.join('\n')
.concat('\n');
await fs.promises.writeFile(filePath, content, 'utf-8');
await expect(readLastLines(filePath, 3)).resolves.toBe(
'line-1998\nline-1999\nline-2000\n',
);
});
it('returns an empty string when zero lines are requested', async () => {
const filePath = path.join(
os.tmpdir(),
`gemma-logs-${Date.now()}-${Math.random().toString(36).slice(2)}.log`,
);
tempFiles.push(filePath);
await fs.promises.writeFile(filePath, 'line-1\nline-2\n', 'utf-8');
await expect(readLastLines(filePath, 0)).resolves.toBe('');
});
});
describe('logsCommand', () => {
const originalPlatform = process.platform;
beforeEach(() => {
vi.clearAllMocks();
Object.defineProperty(process, 'platform', {
value: 'linux',
configurable: true,
});
vi.mocked(getLogFilePath).mockReturnValue('/tmp/gemma.log');
vi.spyOn(fs.promises, 'access').mockResolvedValue(undefined);
});
afterEach(() => {
Object.defineProperty(process, 'platform', {
value: originalPlatform,
configurable: true,
});
vi.restoreAllMocks();
});
it('waits for the tail process to close before exiting in follow mode', async () => {
const child = createMockChild();
vi.mocked(spawn).mockReturnValue(child);
let resolved = false;
const handlerPromise = (
logsCommand.handler as (argv: Record<string, unknown>) => Promise<void>
)({}).then(() => {
resolved = true;
});
await flushMicrotasks();
expect(spawn).toHaveBeenCalledWith(
'tail',
['-f', '-n', '20', '/tmp/gemma.log'],
{ stdio: 'inherit' },
);
expect(resolved).toBe(false);
expect(exitCli).not.toHaveBeenCalled();
child.emit('close', 0);
await handlerPromise;
expect(exitCli).toHaveBeenCalledWith(0);
});
it('uses one-shot tail output when follow is disabled', async () => {
const child = createMockChild();
vi.mocked(spawn).mockReturnValue(child);
const handlerPromise = (
logsCommand.handler as (argv: Record<string, unknown>) => Promise<void>
)({ follow: false });
await flushMicrotasks();
expect(spawn).toHaveBeenCalledWith('tail', ['-n', '20', '/tmp/gemma.log'], {
stdio: 'inherit',
});
child.emit('close', 0);
await handlerPromise;
expect(exitCli).toHaveBeenCalledWith(0);
});
it('follows from the requested line count when both --lines and --follow are set', async () => {
const child = createMockChild();
vi.mocked(spawn).mockReturnValue(child);
const handlerPromise = (
logsCommand.handler as (argv: Record<string, unknown>) => Promise<void>
)({ lines: 5, follow: true });
await flushMicrotasks();
expect(spawn).toHaveBeenCalledWith(
'tail',
['-f', '-n', '5', '/tmp/gemma.log'],
{ stdio: 'inherit' },
);
child.emit('close', 0);
await handlerPromise;
expect(exitCli).toHaveBeenCalledWith(0);
});
});
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