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

const { test } = require('tap');
const sandbox = require('@log4js-node/sandboxed-module');
const layouts = require('../../lib/layouts');

test('stdout appender', (t) => {
  const output = [];

  const appender = sandbox
    .require('../../lib/appenders/stdout', {
      globals: {
        process: {
          stdout: {
            write(data) {
              output.push(data);
            },
          },
        },
      },
    })
    .configure(
      { type: 'stdout', layout: { type: 'messagePassThrough' } },
      layouts
    );

  appender({ data: ['cheese'] });
  t.plan(2);
  t.equal(output.length, 1, 'There should be one message.');
  t.equal(output[0], 'cheese\n', 'The message should be cheese.');
  t.end();
});