Compare assert exception in should(JavaScript) and unittest(Python)

should

With should, exception is asserted like this:

it('should throw when n isnt Number', function () {
    (function () {
      main.fibonacci('abcd');
    }).should.throw('n should be a Number');
  });

This library adds an attribute should to Object. The should attribute includes a bunch of assert functions. With this, you can do (5).should.above(3). It will be even harder in Python, because types defined in C cannot be monkeypatched. The implement of should.throw is a simple try/catch.

unittest

With assertRaises in unittest, exception is asserted like this:

with self.assertRaisesRegexp(ValueError, 'literal'):
    int('XYZ')

It's much more simple than another way, because we don't need to pass test function as an argument to the assert function, no matter the argument called this lol.
Exception is not catched by a try/except statement, but in __exit__ context manager.