Practicing BDD with python [closed]

Answer 1

Try out pyspecs. Making tests easy to read and constantly running during development were two of my main goals in creating this project.

Test Code:

from pyspecs import given, when, then, and_, the, this

with given.two_operands:
    a = 2
    b = 3

    with when.supplied_to_the_add_function:
        total = a + b

        with then.the_total_should_be_mathmatically_correct:
            the(total).should.equal(5)

        with and_.the_total_should_be_greater_than_either_operand:
            the(total).should.be_greater_than(a)
            the(total).should.be_greater_than(b)

    with when.supplied_to_the_subtract_function:
        difference = b - a

        with then.the_difference_should_be_mathmatically_correct:
            the(difference).should.equal(1)

Console Output:

# run_pyspecs.py

  | • given two operands 
  |   • when supplied to the add function 
  |     • then the total should be mathmatically correct 
  |     • and the total should be greater than either operand 
  |   • when supplied to the subtract function 
  |     • then the difference should be mathmatically correct 

(ok) 6 passed (6 steps, 1 scenarios in 0.0002 seconds)

Answer 2

I recommend you to use a set of tools developed to help programmers in the practice of BDD and TDD. This tool set is composed by: pycukes, specloud, ludibrio and should-dsl.

Should-DSL will give you RSpec-like expectations. Everything you can do with RSpec expectation API, should-dsl does too. You can grab the latestversion from Github.

SpecLoud helps you on running BDD-like unittests. You can install it by doing

pip install specloud

Ludibrio is a library for test doubles (Mocks, Stubs and Dummies). Install it via

pip install ludibrio

And PyCukes is the main tool for BDD. It will run the Scenarios, etc. Again,

pip install pycukes

For more info please read the tools documentation at PyPi.

Answer 3

You can use "sure" for expressive assertions (just like in RSpec)

Answer 4

Lettuce means to be a cucumber-like tool for python: http://lettuce.it/

You can grab the source at github.com/gabrielfalcao/lettuce

Answer 5

Ian Bicking recommends using doctest for behavior driven design:

I personally tend to use nose and voidspace mock in a behavior driven design style. Specifically, the spec plugin for nose is excellent for BDD.

Answer 6

I really recommend behave.

Looking for a Cucumber clone for Python, I started using lettuce, but found it a pretty clumsily designed replica. Very Unpythonic.

Then I discovered behave, and have been really happy with it.