Python how to mock envvars in the test

user_6134218 0
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Hi guys my actual method uses envvars which will be set as a constant

  PERSONAL_ID = os.getenv("PERSONAL_ID")
  PATH_NAME = os.getenv("PATH_NAME")

I use this envvar in my method (not as a input parameter) and now I try to test it but during the assert I get "None"

I have tried this above my test:

@mock.patch.dict(os.environ, {"PERSONAL_ID ": "123", "PATH_NAME": "test_path"})
pytest unit-testing python
2 Answers

Probably this was caused by a typo, remove space at the end of PERSONAL_ID:

@mock.patch.dict(os.environ, {"PERSONAL_ID": "123", "PATH_NAME": "test_path"})

This example works:

import os


def uses_env_vars():
    return os.getenv('PERSONAL_ID')


@mock.patch.dict(os.environ, {"PERSONAL_ID": "123", "PATH_NAME": "test_path"}, clear=True)
def test_uses_env_vars():
    assert uses_env_vars() == os.environ["PERSONAL_ID"]
user_99267210

You don't really need to "mock" the environment variables. You can just set them to an appropriate value:

os.environ['PERSONAL_ID'] = '123'
os.environ['PATH_NAME'] = 'test_path'

These will only be visible within your tests (because that's just how environment variables work -- they can be seen in the current process and its children).

user_1473560
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