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How to Mock Twine Upload to TestPyPI in Python

Simulate a twine upload to TestPyPI with a dry-run mock function that validates distribution files and prints the intended upload action without any network call.

twine testpypi mock
Python 
import subprocess
import sys

# Mock twine upload to TestPyPI using subprocess dry-run
def mock_twine_upload(dist_file: str, repo_url: str = "https://test.pypi.org/legacy/") -> None:
    """Simulate twine upload by checking dist file and printing intended action."""
    if not dist_file.endswith((".whl", ".tar.gz")):
…
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