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* @license
* Copyright 2026 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import { initializeOutputListenersAndFlush } from './gemini.js';
import { coreEvents, CoreEvent, type Config } from '@google/gemini-cli-core';
// Mock core dependencies
vi.mock('@google/gemini-cli-core', async (importOriginal) => {
const actual =
await importOriginal<typeof import('@google/gemini-cli-core')>();
return {
...actual,
writeToStdout: vi.fn(),
writeToStderr: vi.fn(),
};
});
import { writeToStdout, writeToStderr } from '@google/gemini-cli-core';
describe('Output Redirection', () => {
beforeEach(() => {
vi.clearAllMocks();
// Clear listeners to simulate a clean state for each test
coreEvents.removeAllListeners();
});
afterEach(() => {
coreEvents.removeAllListeners();
});
it('should redirect buffered stdout to stderr when output format is json', () => {
const mockConfig = {
getOutputFormat: () => 'json',
} as unknown as Config;
// Simulate buffered output
coreEvents.emitOutput(false, 'informational message');
coreEvents.emitOutput(true, 'error message');
// Initialize listeners and flush
initializeOutputListenersAndFlush(mockConfig);
// Verify informational message was forced to stderr
expect(writeToStderr).toHaveBeenCalledWith(
'informational message',
undefined,
);
expect(writeToStderr).toHaveBeenCalledWith('error message', undefined);
expect(writeToStdout).not.toHaveBeenCalled();
});
it('should NOT redirect buffered stdout to stderr when output format is NOT json', () => {
const mockConfig = {
getOutputFormat: () => 'text',
} as unknown as Config;
// Simulate buffered output
coreEvents.emitOutput(false, 'regular message');
// Initialize listeners and flush
initializeOutputListenersAndFlush(mockConfig);
// Verify regular message went to stdout
expect(writeToStdout).toHaveBeenCalledWith('regular message', undefined);
expect(writeToStderr).not.toHaveBeenCalled();
});
it('should NOT force stdout to stderr when config is undefined (early init/version)', () => {
// Simulate buffered output during early init
coreEvents.emitOutput(false, 'early init message');
// Initialize with undefined config
initializeOutputListenersAndFlush(undefined);
// Verify it went to stdout (default behavior)
expect(writeToStdout).toHaveBeenCalledWith('early init message', undefined);
expect(writeToStderr).not.toHaveBeenCalled();
});
it('should attach ConsoleLog and UserFeedback listeners even if Output already has one', () => {
// Manually attach an Output listener
coreEvents.on(CoreEvent.Output, vi.fn());
// Initialize - should still attach ConsoleLog and UserFeedback defaults
initializeOutputListenersAndFlush(undefined);
// Simulate events
coreEvents.emitConsoleLog('info', 'stray log');
coreEvents.emitFeedback('info', 'stray feedback');
// Draining happens inside initializeOutputListenersAndFlush for existing backlog,
// but here we check the newly attached listeners for immediate emission.
expect(writeToStderr).toHaveBeenCalledWith('stray log\n');
expect(writeToStderr).toHaveBeenCalledWith('stray feedback\n');
});
});
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