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How to Mock subprocess.run in Python Tests

Mock subprocess.run to test a Git submodule update command without executing it in your test suite.

unittest.mock subprocess git
Python 
import subprocess
from unittest.mock import Mock, patch

def update_submodules():
    subprocess.run(["git", "submodule", "update", "--init", "--recursive"], check=True)

with patch("subprocess.run") as mock_run:
    mock_run.return_value = Mock(returncode=0)
    update_submodules()
    mock_run.assert_called_once_wit…
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