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Auth & security at scale

OAuth2, JWT, IAM patterns, secrets rotation, and least-privilege service auth.

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Auth & security at scale medium

How to Mock Environment Variables in Python

A context manager that injects and restores environment variables for isolated testing of config-dependent code.

env vars context manager testing
Python 
import os

class EnvInjector:
    def __init__(self, mock_vars=None):
        self.mock_vars = mock_vars or {}
        self.original = {}

    def __enter__(self):
        for key, value in self.mock_vars.items():
            if key in os.environ:
                self.original[key] = os.environ[key]
            os.env…
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