pytest-diff 0.1.8

A simple plugin to use with pytest

A simple plugin to use with pytest

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This pytest plugin was generated with Cookiecutter along with @hackebrot’s cookiecutter-pytest-plugin template.

Features

• Readable diffs for failed tests

• Customizable diffs for your classes

Requirements

• pytest

• deepdiff

• pprintpp

Installation

You can install “pytest-diff” via pip from PyPI:

$ pip install pytest-diff

Usage

class Person:
    def __init__(self, name, age, favorites):
        self.name = name
        self.age = age
        self.favorites = favorites


def test_person():
    a = Person("Alice", age=21, favorites={"food": "spam", "movie": "Life of Brian"})
    b = Person("Alice", age=21, favorites={"food": "eggs", "movie": "Life of Brian"})
    assert a == b

Running pytest gives:

______________________________ test_person ______________________________

    def test_person():
        a = Person("Alice", age=21, favorites={'food': 'spam', 'movie': 'Life of Brian'})
        b = Person("Alice", age=21, favorites={'food': 'eggs', 'movie': 'Life of Brian'})
>       assert a == b
E       assert
E         <test_person.Person object at 0x7fa326d769e8>
E         ==
E         <test_person.Person object at 0x7fa326d76be0>
E         {'values_changed': {"root.favorites['food']": {'new_value': 'spam', 'old_value': 'eggs'}}}

examples/test_person.py:11: AssertionError

To customize diffs for a specific type:

import pytest_diff

from tests import utils

@pytest_diff.dispatcher.dispatch
def diff(x: utils.Container, y: utils.Container):
    return  ["My custom diff", "has multiple lines."]

def test_container_unequal():
     c1 = utils.Container(["a", "b"])
     c2 = utils.Container(["d", "e", "f"])
     assert c1 == c2

Contributing

Contributions are very welcome. Tests can be run with tox, please ensure the coverage at least stays the same before you submit a pull request.

License

Distributed under the terms of the MIT license, “pytest-diff” is free and open source software

Issues

If you encounter any problems, please file an issue along with a detailed description.