python-fake

Python Fake

🌟 Overview

This project provides a Fake class that can be used to replace any object in a test, in development environment or in any other situation where you need to replace an object with a fake one.

The tries to provide a mock implementation for any usage, including properties, items, length, iterator, return value, await value, etc so that it never fails in runtime due to a missing implementation.

On the other hand, sometimes other pieces of code expect a certain implementation and the default implementation of the Fake class is not enough. In this case, you can use the __Fake_... parameters in the constructor to provide a more specific implementation.

At the moment, it doesn't provide tools for monitoring how the object was used, but it is planned to be implemented in the future.

🔎 Sample Usage

Fakeing the picamera2 module of Raspberry Pi so that one can run the code on a non-Raspberry Pi development environment:

from fake import Fake

sys.modules['picamera2'] = Fake(
    _Fake__props={
        'Picamera2': Fake(
            _Fake__return_value=Fake(
                _Fake__props={
                    'capture_array': Fake(
                        _Fake__return_value=np.zeros((1, 1, 3), dtype=np.uint8),
                    ),
                },
            ),
        ),
    },
)

⚙️ Parameters

A Fake object can be created with the following parameters:

• _Fake__props: A dictionary that contains the properties of the object and their respective values.
• _Fake__items: A dictionary that contains the items of the object and their respective values.
• _Fake__list: A list that contains the items of the object. (in case the index is a number and not listed in the __items dictionary). It also sets the length of the object if _Fake__length is not set.
• _Fake__return_value: The return value of the object when it is called.
• _Fake__await_value: The return value of the object when it is awaited.
• _Fake__length: The length of the object when it is queried via the len function.
• _Fake__iter: The iterator of the object when it is queried via the iter function.

📦 Installation

Pip

pip install python-fake

Poetry

poetry add python-fake