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