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Logger-test.ts
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Logger-test.ts
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/**
* Copyright (c) 2021 GraphQL Contributors
* All rights reserved.
*
* This source code is licensed under the license found in the
* LICENSE file in the root directory of this source tree.
*
*/
import { tmpdir } from 'node:os';
import { Logger } from '../Logger';
describe('Logger', () => {
let mockedStdoutWrite: jest.SpyInstance = null;
let mockedStderrWrite: jest.SpyInstance = null;
beforeEach(async () => {
mockedStdoutWrite = jest
.spyOn(process.stdout, 'write')
.mockImplementation(() => true);
mockedStderrWrite = jest
.spyOn(process.stderr, 'write')
.mockImplementation(() => true);
});
afterEach(() => {
mockedStdoutWrite.mockReset();
mockedStderrWrite.mockReset();
});
it('logs to stdout', () => {
const logger = new Logger(tmpdir());
logger.info('log test');
expect(mockedStdoutWrite.mock.calls.length).toBe(1);
expect(mockedStdoutWrite.mock.calls[0][0]).toContain('log test');
expect(mockedStderrWrite.mock.calls.length).toBe(0);
});
it('logs to stderr', () => {
const logger = new Logger(tmpdir());
logger.error('error test');
expect(mockedStdoutWrite.mock.calls.length).toBe(0);
expect(mockedStderrWrite.mock.calls.length).toBe(1);
expect(mockedStderrWrite.mock.calls[0][0]).toContain('error test');
});
it('only writes to stderr with "stderrOnly" enabled', () => {
const stderrOnly = true;
const logger = new Logger(tmpdir(), stderrOnly);
logger.info('info test');
logger.warn('warn test');
// log is only logged to file now :)
logger.log('log test');
logger.error('error test');
expect(mockedStdoutWrite.mock.calls.length).toBe(0);
expect(mockedStderrWrite.mock.calls.length).toBe(3);
expect(mockedStderrWrite.mock.calls[0][0]).toContain('info test');
expect(mockedStderrWrite.mock.calls[1][0]).toContain('warn test');
expect(mockedStderrWrite.mock.calls[2][0]).toContain('error test');
});
});