Run simple unit tests.

simple_test_runner.js

var lineWidth = 80 - 'PASS'.length - 4 * 3;   // 4 * 3 is for indenting 4 times
var suites = {
  'test foo': require('./test/test_foo'),
  'test bar': require('./test/test_bar'),
};

var padding = function(length, pad) {
  return (new Array(length + 1)).join(pad || ' ');
};

var runTest = function(descr, depth, test) {
  var indent = padding(depth * 3),
      description = indent + descr,
      pass;
  if (typeof test === 'function') {
    pass = test();
    outputPassOrFail(description, depth, pass);
  } else {
    console.log(description);
    pass = true;
    Object.keys(test).forEach(function(subDesc) {
      if (!runTest(subDesc, depth + 1, test[subDesc])) pass = false;
    });
    outputPassOrFail(description, depth, pass);
  }
  return pass;
};

var outputPassOrFail = function(description, depth, pass) {
  var dots = padding(lineWidth - description.length + depth * 3, '.'),
      inner = pass ? '32mPASS' : '31mFAIL';
  console.log(description + dots + '\033[' + inner + '\033[0m');
};

runTest('all tests', 0, suites);