Behavior driven development

bdd

http://net.tutsplus.com/tutorials/python-tutorials/behavior-driven-development-in-python/
Note: feature files needs newline at each "given", "when", etc (otherwise you get errors like below:)

Traceback (most recent call last):
      File "/Library/Python/2.7/site-packages/lettuce/core.py", line 143, in __call__
        ret = self.function(self.step, *args, **kw)
      File "/Users/greeness/Documents/workspace/hehe/tests/features/steps.py", line 9, in compute_its_fatorial
        world.number = factorial(world.number)
    AttributeError: 'thread._local' object has no attribute 'number'

https://groups.google.com/forum/#!msg/lettuce-users/aXHxMHyOD9I/6HuZgpjOs8kJ

http://pythonhosted.org/lettuce/tutorial/simple.html#lettuce-b-define-steps-in-python