TST: Explicitly pass NumPy path to cython during tests (also speed them up) #25141
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This mainly injects the
-I
into the cython build in meson by fetching the actual numpy directory during the build to paper over gh-25135.It clearly isn't a fix, since it is probably a Cython issue (or maybe an issue with the meson in-place build setup).
I also modified the building fixture to only run once, the tests are ridiculously slow otherwise (there were much fewer tests not long ago).