Serverboards Mock Library -- SMock

SMock is a simple mocking library that helps automated testing of Python code.

Basic usage is to create a yaml file with the mocked functions as keys, and a list of marching args list/kwargs object to a result.

All possible matches are checked in order, and if any matches, that response is given to the caller. A special * marker can be used to match any.

Example of use

Generate a yaml file with the data to mock, mock.yaml:

requests.get:
  - args: https://example.com/item/1
  - result:
    status_code: 200
    json:
      desription: Mocked
requests.get:
  - args: "*"
    result:
      status_code: 404
      content: Not found

This file says that if the user asks for the https://mock.example, it gets a status_code 200 and more info. Any other request, gets a 404.

To use it:

import requests

def get_item_description(id):
  data = requests.get("https://example.com/item/%s" % id)
  return data.json()["description"]

def test():
  smock import SMock
  smock = SMock("data.yaml")
  requests.get = smock.mock_method("requests.get")

  assert get_item_description(1) == "Mocked"

if __name__ == "__main__":
  test()

Tis hypotetical library, has a function get_item_description. When calling this file as a script (__main__), the test is called which monkey patches the requests.get function with our mocked data.

This mocked data returns a special object that behaves like a dict, an object a callable function and so on. In this case we call the json() virtual method to just get an object with a description field.

Extra goodies

• All data is mocked to behave like a dict, a object and a function
• Can load external data with file:FILENAME

Contributing

If you have ideas, improvements or comments, please open a github issue.