Blog post here: http://berzniz.com/post/66612637094/javascript-in-line-unit-tests Based on a comment to http://sergimansilla.com/blog/extending-js-inline-unit-tests/

inline_test.js

var inline_test = function(func, inputs, expected_outputs) {
  for (var i in inputs) {
    var input = inputs[i];
    var expected = expected_outputs[i];
    var result = func(input);
    if (result != expected) {
      console.log('Test failed! Expected', expected, 'but got', result);
      // Or throw an error...
    }
  }

  return func;
};

var square = inline_test(function square(n) {
  return n * n;
}, [2, 4, 8, 16], [4, 16, 64, 99999]);