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How to Mock a PEP 517 Build Backend in Python

Use unittest.mock.Mock to simulate a PEP 517 backend interface, stub build hooks, and verify calls for package build automation.

pep517 unittest.mock packaging
Python 
import json
from unittest.mock import Mock

# Simulate a PEP 517 backend interface
class Pep517Backend:
    def build_wheel(self, wheel_directory, config_settings=None, metadata_directory=None):
        return f"{wheel_directory}/mock_package-1.0.0-py3-none-any.whl"

    def get_requires_for_build_wheel(self, config_s…
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