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import fs from 'fs';
import { mockProcessStdout } from 'jest-mock-process';
import mockFs from 'mock-fs';
let mockStdout;
let getLogger;
beforeEach( () => {
( { getLogger } = require( '../index' ) );
mockStdout = mockProcessStdout();
mockFs( {
'/tmp': {
'calypso.log': '',
},
} );
} );
afterEach( () => {
jest.resetModules();
mockStdout.mockRestore();
delete process.env.CALYPSO_LOGFILE;
mockFs.restore();
} );
describe( 'Logger', () => {
it( "Returns a logger with the name 'calypso'", () => {
const logger = getLogger();
logger.info( 'message' );
expect( mockStdout ).toHaveBeenCalledTimes( 1 );
const loggedMessage = mockStdout.mock.calls[ 0 ][ 0 ];
expect( JSON.parse( loggedMessage ) ).toEqual( expect.objectContaining( { name: 'calypso' } ) );
} );
it( 'Logs info and above levels to stdout', () => {
const logger = getLogger();
logger.trace( 'trace' ); // not logged
logger.debug( 'debug' ); // not logged
logger.info( 'info' );
logger.warn( 'warn' );
logger.error( 'error' );
logger.fatal( 'fatal' );
const loggedMessages = mockStdout.mock.calls.map( ( args ) => JSON.parse( args[ 0 ] ) );
expect( loggedMessages ).toEqual( [
expect.objectContaining( { msg: 'info', level: 30 } ),
expect.objectContaining( { msg: 'warn', level: 40 } ),
expect.objectContaining( { msg: 'error', level: 50 } ),
expect.objectContaining( { msg: 'fatal', level: 60 } ),
] );
} );
it( 'Logs info and above levels to the filesystem when the env variable is present', async () => {
process.env.CALYPSO_LOGFILE = '/tmp/calypso.log';
const logger = getLogger();
logger.trace( 'trace' ); // not logged
logger.debug( 'debug' ); // not logged
logger.info( 'info' );
logger.warn( 'warn' );
logger.error( 'error' );
logger.fatal( 'fatal' );
const logLines = ( await fs.promises.readFile( '/tmp/calypso.log', 'utf8' ) )
.split( '\n' )
.filter( ( line ) => line.length > 0 )
.map( JSON.parse );
expect( logLines ).toEqual( [
expect.objectContaining( { msg: 'info', level: 30 } ),
expect.objectContaining( { msg: 'warn', level: 40 } ),
expect.objectContaining( { msg: 'error', level: 50 } ),
expect.objectContaining( { msg: 'fatal', level: 60 } ),
] );
} );
it( 'Reuses the same logger', () => {
const logger1 = getLogger();
const logger2 = getLogger();
expect( logger1 ).toEqual( logger2 );
} );
} );
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