Python Automation Framework-Lettuce Framework

Lettuce is another BDD framework for Python. It is similar to Behave in that it allows you to write behavior specifications in a Gherkin-like language, and then map those specifications to Python code using step definitions.

Prerequisites for Lettuce:

Before installing Lettuce, do the following:

• Install Python 2.7.14 or above
• Install Pycharm or an equally capable IDE
• Install the Python package manager

Key Benefits of Lettuce:

• Enables developers to program more than one scenario and describe its characteristics in a simple, natural language
• Enables, much like Behave, productive coordination due to specs being defined in a similar format

Disadvantages of Lettuce:

• Lettuce requires a highly refined system of communication between QAs, developers, and stakeholders in order to be truly functional as a Python testing framework. There is no room for ambiguity here.

Here’s a brief example using Lettuce:

Feature: Calculator
    In order to avoid mistakes
    As a clumsy user
    I want to be able to add two numbers

    Scenario: Add two numbers
        Given the first number is 2
        And the second number is 3
        When the numbers are added
        Then the result should be 5

And the corresponding step definitions in Python using Lettuce:

from lettuce import step, world

@step('the first number is (\d+)')
def given_the_first_number(step, number):
    world.first_number = int(number)

@step('the second number is (\d+)')
def given_the_second_number(step, number):
    world.second_number = int(number)

@step('the numbers are added')
def when_the_numbers_are_added(step):
    world.result = world.first_number + world.second_number

@step('the result should be (\d+)')
def then_the_result_should_be(step, result):
    assert world.result == int(result)

To clarify, you can choose either Behave or Lettuce based on your preferences and project requirements. They serve similar purposes, allowing you to write tests in a human-readable format and then map those tests to Python code. If you’re specifically interested in Behave, you can use it for behavior-driven development in a Python context. If you prefer Lettuce, it provides a similar BDD approach with its own set of features.