shows steps to reproduce #373

features_steps.py

from lettuce import *

@step('I have the number (\d+)')
def have_the_number(step, number):
    world.number = int(number)

@step('I compute its factorial')
def compute_its_fatorial(step):
    world.number = factorial(world.number)

@step('I see the number (\d+)')
def check_number(step, expected):
    expected = int(expected)
    assert world.number == expected, \
        "Got %d" % world.number

def factorial(number):
    return -1

features_terrain.py

from lettuce import *

@before.each_scenario
def raiser(step):
	pass


@after.each_scenario
def last_raiser(step):
	raise Exception

features_zero.feature

Feature: Compute factorial
In order to play with Lettuce As beginners We’ll implement factorial
Scenario: Factorial of 0
Given I have the number 0 When I compute its factorial Then I see the number 1