BDD using Lettuce

Writing Beautiful Tests that Last

By Amit Sethi / @dusual

BDD is a second-generation, outside-in, pull-based, multiple-stakeholder, multiple-scale, high-automation, agile methodology. It describes a cycle of interactions with well-defined outputs, resulting in the delivery of working, tested software that matters.

- Dan North

Let's come to this definition, later

Tests are the requirements

1. How are requirements created in your organization?
2. User Stories.
3. Can we have a DSL that can be understood by the PMs as well as your application

                 Feature: Manipulate strings
                   In order to have some fun
                   As a programming beginner
                   I want to manipulate strings
                 
                 Scenario: Uppercased strings
                   Given I have the string "lettuce leaves"
                   When I put it in upper case
                   Then I see the string is "LETTUCE LEAVES"
                                  

                from lettuce import *
                @step('I have the string "(.*)"')
                def have_the_string(step, string):
                    world.string = string
                
                @step
                def i_put_it_in_upper_case(step):
                    world.string = world.string.upper()
                
                @step
                def see_the_string_is(step, expected):
                    '''I see the string is "(.*)"'''
                    assert world.string == expected, 
                        "Got %s" % world.string
                                  

Some of our own examples

Using different webdrivers and remote webdrivers

Saucelabs / BrowserStack

THE END