CODEWITHSUNDEEP
pythontestingbdd
JtR
JtR

Reputation: 20676

Practicing BDD with python

Which are the most advanced frameworks and tools there are available for python for practicing Behavior Driven Development? Especially finding similar tools as rspec and mocha for ruby would be great.

Upvotes: 134

Views: 46706

Answers (10)

user333958
user333958

Reputation: 505

Lettuce means to be a cucumber-like tool for python.

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

Upvotes: 48

Ryan
Ryan

Reputation: 15336

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.

Upvotes: 38

Douglas Camata
Douglas Camata

Reputation: 597

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.

Upvotes: 29

Michael Whatcott
Michael Whatcott

Reputation: 5985

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)

Upvotes: 6

Gabriel Falcão
Gabriel Falcão

Reputation: 1155

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

Upvotes: 9

Gregarious
Gregarious

Reputation: 586

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.

Upvotes: 46

Steve
Steve

Reputation: 735

Great post and answers. Just wanted to update to include Freshen in this list as I read pycukes is discontinued. A good post about using BDD and Django with Freshen is here.

Upvotes: 11

Refael Ackermann
Refael Ackermann

Reputation: 1578

I like Pyccuracy a lot. I'm implementing it on a mid sized project these days.

Upvotes: 6

Michael Hanson
Michael Hanson

Reputation:

The Pyccuracy project is an effort to provide a domain-specific language for BDD in Python.

Unlike doctest, which works at the API level, it encodes higher-level operations such as loading a web page and submitting a form. I haven't used it but it looks somewhat promising if that is what you're looking for.

Upvotes: 8

ddaa
ddaa

Reputation: 54514

I am probably completely missing the point, but what I retained of the original BDD paper was that BDD was just TDD repackaged to emphasize some best practices.

If my interpretation is correct, you can get a BDD framework just by renaming methods around in any xUnit implementation. So just go ahead and use the standard library's unittest.

EDIT: A quick google turned up a Behaviour module in the Cheese Shop. Further searching for BDD there did not find anything else.

Upvotes: 4

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