32 lines
1.1 KiB
Python
32 lines
1.1 KiB
Python
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"""Test possibility of patching fftpack with pyfftw.
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No module source outside of scipy.fftpack should contain an import of
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the form `from scipy.fftpack import ...`, so that a simple replacement
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of scipy.fftpack by the corresponding fftw interface completely swaps
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the two FFT implementations.
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Because this simply inspects source files, we only need to run the test
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on one version of Python.
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"""
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from pathlib import Path
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import re
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import tokenize
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from numpy.testing import assert_
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import scipy
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class TestFFTPackImport:
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def test_fftpack_import(self):
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base = Path(scipy.__file__).parent
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regexp = r"\s*from.+\.fftpack import .*\n"
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for path in base.rglob("*.py"):
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if base / "fftpack" in path.parents:
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continue
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# use tokenize to auto-detect encoding on systems where no
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# default encoding is defined (e.g., LANG='C')
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with tokenize.open(str(path)) as file:
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assert_(all(not re.fullmatch(regexp, line)
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for line in file),
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f"{path} contains an import from fftpack")
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