simple unit testsiute for javascript

jsUnit.js

(function() {
  // styles for console
  var greenStyle = 'font-weight: bold; color: green;';
  var redStyle = 'font-weight: bold; color: red;';
  var normalStyle = 'font-weight: none;';

  // customizable assertions
  var _assertions = {
    truth: function(obj) {
      if(obj != true) {
        throw new Error('argument is not true');
      }
    },
    equality: function(a, b) {
      if(a != b) {
        throw new Error('expected ' + a + ' to be equal ' + b);
      }
    }
  };

  // jsUnit component
  this.jsUnit = {
    test: function(description, testUnit) {
      try {
        testUnit(_assertions);
        console.log('%cjsUnit: "' + description + '"', greenStyle);
      } catch(exception) {
        console.log('%cjsUnit: "' + description + '" - ' + exception.message + "\n%c" + exception.stack, redStyle, normalStyle);
      }
    }
  };
})();

// example:

// jsUnit.test('truth test that fails', function(assert) {
//   assert.truth(false);
// });
// jsUnit.test('truth test that passes', function(assert) {
//   assert.truth(true);
// });
// jsUnit.test('equality test that fails', function(assert) {
//   assert.equality(2, 4);
// });
// jsUnit.test('equality test that passes', function(assert) {
//   assert.equality(3, '3');
// });