test-util-log.js

// Copyright Joyent, Inc. and other Node contributors.
//
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//
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'use strict';
const common = require('../common');
const assert = require('assert');
const util = require('util');

assert.ok(process.stdout.writable);
assert.ok(process.stderr.writable);

const strings = [];
common.hijackStdout(function(data) {
  strings.push(data);
});
common.hijackStderr(common.mustNotCall('stderr.write must not be called'));

const tests = [
  { input: 'foo', output: 'foo' },
  { input: undefined, output: 'undefined' },
  { input: null, output: 'null' },
  { input: false, output: 'false' },
  { input: 42, output: '42' },
  { input: function() {}, output: '[Function: input]' },
  { input: parseInt('not a number', 10), output: 'NaN' },
  { input: { answer: 42 }, output: '{ answer: 42 }' },
  { input: [1, 2, 3], output: '[ 1, 2, 3 ]' }
];

// test util.log()
const re = /[0-9]{1,2} [A-Z][a-z]{2} [0-9]{2}:[0-9]{2}:[0-9]{2} - (.+)$/;
tests.forEach(function(test) {
  util.log(test.input);
  const result = strings.shift().trim();
  const match = re.exec(result);
  assert.ok(match);
  assert.strictEqual(match[1], test.output);
});

assert.strictEqual(process.stdout.writeTimes, tests.length);

common.restoreStdout();