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mamba: the definitive test runner for Python

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mamba is the definitive test runner for Python. Born under the banner of behavior-driven development.

Install

I recommend to use pipenv for managing your dependencies, thus you can install mamba like any other Python package.

By example:

 $ pipenv install mamba

But you also can use pip:

 $ pip install mamba

Getting Started

Write a very simple example that describes your code behaviour:

 # tennis_spec.py
 from mamba import description, context, it
 from expects import expect, equal
 with description('Tennis') as self:
 with it('starts with 0 - 0 score'):
 rafa_nadal = "Rafa Nadal"
 roger_federer = "Roger Federer"
 game = Game(rafa_nadal, roger_federer)
 expect(game.score()).to(equal((0, 0)))

Run the example, and don't forget to watch it fail!

 $ pipenv run mamba tennis_spec.py
 F
 1 examples failed of 1 ran in 0.0023 seconds
 Failures:
 1) Tennis it starts with 0 - 0 score
 Failure/Error: tennis_spec.py game = Game(rafa_nadal, roger_federer)
 NameError: global name 'Game' is not defined
 File "tennis_spec.py", line 8, in 00000001__it starts with 0 - 0 score--
 game = Game(rafa_nadal, roger_federer)

Now write as little code for making it pass.

 # tennis_spec.py
 from mamba import description, context, it
 from expects import expect, equal
 import tennis
 with description('Tennis') as self:
 with it('starts with 0 - 0 score'):
 rafa_nadal = "Rafa Nadal"
 roger_federer = "Roger Federer"
 game = tennis.Game(rafa_nadal, roger_federer)
 expect(game.score()).to(equal((0, 0)))

 # tennis.py
 class Game(object):
 def __init__(self, player1, player2):
 pass
 def score(self):
 return (0, 0)

Run the spec file and enjoy that all tests are green!

 $ pipenv run mamba tennis_spec.py
 .
 1 examples ran in 0.0022 seconds

Settings

Mamba provides a way to configuration using spec/spec_helper.py or specs/spec_helper.py This module function is read after parsing arguments so configure function overrides settings

A sample config file :

def configure(settings):
 # settings.slow_test_threshold = 0.075
 # settings.enable_code_coverage = False
 # settings.code_coverage_file = '.coverage'
 settings.format = 'documentation'
 # settings.no_color = False
 # settings.tags = None

Official Manual

You can read more features about mamba in its official manual

Contributors

Here's a list of all the people who have contributed.

I'm really grateful to each and every of them!

If you want to be one of them, fork repository and send a pull request.