log4js-node/test/tap/stacktraces-test.js

const { test } = require('tap');

test('Stacktraces from errors in different VM context', (t) => {
  const log4js = require('../../lib/log4js');
  const recorder = require('../../lib/appenders/recording');
  const layout = require('../../lib/layouts').basicLayout;
  const vm = require('vm');

  log4js.configure({
    appenders: { vcr: { type: 'recording' } },
    categories: { default: { appenders: ['vcr'], level: 'debug' } },
  });

  const logger = log4js.getLogger();

  try {
    // Access not defined variable.
    vm.runInNewContext('myVar();', {}, 'myfile.js');
  } catch (e) {
    // Expect to have a stack trace printed.
    logger.error(e);
  }

  const events = recorder.replay();
  // recording appender events do not go through layouts, so let's do it
  const output = layout(events[0]);
  t.match(output, 'stacktraces-test.js');
  t.end();
});