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36 lines
1002 B
36 lines
1002 B
"""Tests for the optional typing-extensions dependency."""
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import sys
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import textwrap
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import subprocess
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CODE = textwrap.dedent(r"""
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import sys
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import importlib
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assert "typing_extensions" not in sys.modules
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assert "numpy.typing" not in sys.modules
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# Importing `typing_extensions` will now raise an `ImportError`
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sys.modules["typing_extensions"] = None
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assert importlib.import_module("numpy.typing")
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""")
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def test_no_typing_extensions() -> None:
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"""Import `numpy.typing` in the absence of typing-extensions.
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Notes
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-----
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Ideally, we'd just run the normal typing tests in an environment where
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typing-extensions is not installed, but unfortunatelly this is currently
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impossible as it is an indirect hard dependency of pytest.
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"""
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p = subprocess.run([sys.executable, '-c', CODE], capture_output=True)
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if p.returncode:
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raise AssertionError(
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f"Non-zero return code: {p.returncode!r}\n\n{p.stderr.decode()}"
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)
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