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34 lines
1.0 KiB
Python
34 lines
1.0 KiB
Python
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"""Shared test fixtures."""
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import subprocess
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import sys
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import pytest
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_HARNESSX_GUARD = (
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"\nimport sys as _sys\n"
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"_leaked = sorted(m for m in _sys.modules if m == 'harnessx' or m.startswith('harnessx.'))\n"
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"assert not _leaked, 'leaked harnessx modules: ' + repr(_leaked)\n"
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)
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@pytest.fixture
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def assert_cold_of_harnessx(): # type: ignore[no-untyped-def]
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"""Run ``code`` in a fresh interpreter and assert it imported no ``harnessx`` module.
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Hermetic by construction: the lazy-import guarantee is verified the same way
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whether or not the optional extra is installed in this environment (a global
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``sys.modules`` check would be polluted by other tests once the extra is present).
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"""
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def _check(code: str) -> str:
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proc = subprocess.run(
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[sys.executable, "-c", code + _HARNESSX_GUARD],
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capture_output=True,
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text=True,
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)
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assert proc.returncode == 0, f"exit={proc.returncode}\nstdout={proc.stdout}\nstderr={proc.stderr}"
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return proc.stdout
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return _check
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