How to pass environment variables to pytest

Question

Before I start executing the tests in my Python project, I read some environment variables and set some variables with these values read. My tests will run on the desired en

Answer 1

1. I use monkey patch when I don't load environment variable variable outside function.

import os

# success.py
def hello_world():
    return os.environ["HELLO"]

# fail.py
global_ref = os.environ["HELLO"] # KeyError occurs this line because getting environment variable before monkeypatching

def hello_world():
    return global_ref

# test.py
def test_hello_world(monkeypatch):
    # Setup
    envs = {
        'HELLO': 'world'
    }
    monkeypatch.setattr(os, 'environ', envs)

    # Test
    result = hello_world()

    # Verify
    assert(result == 'world')

2. If you use PyCharm you can set environment variables, [Run] -> [Edit Configuration] -> [Defaults] -> [py.tests] -> [Environment Variables]