Add cibw_before_test to install nightly NumPy

Author: lysnikolaou

.gitattributes

@@ -85,3 +85,4 @@ pandas/tests/io/parser/data export-ignore
 
 # Include cibw script in sdist since it's needed for building wheels
 scripts/cibw_before_build.sh -export-ignore
+scripts/cibw_before_test.sh -export-ignore

.github/workflows/wheels.yml

@@ -155,7 +155,6 @@ jobs:
          package-dir: ./dist/${{ startsWith(matrix.buildplat[1], 'macosx') && env.sdist_name || needs.build_sdist.outputs.sdist_file }}
         env:
           CIBW_PRERELEASE_PYTHONS: True
-          CIBW_FREE_THREADED_SUPPORT: True
           CIBW_BUILD: ${{ matrix.python[0] }}-${{ matrix.buildplat[1] }}
           CIBW_BUILD_FRONTEND: ${{ matrix.cibw_build_frontend }}
 

MANIFEST.in

@@ -65,3 +65,4 @@ graft pandas/_libs/include
 
 # Include cibw script in sdist since it's needed for building wheels
 include scripts/cibw_before_build.sh
+include scripts/cibw_before_test.sh

pyproject.toml

@@ -154,7 +154,9 @@ test-command = """
   pd.test(extra_args=["-m not clipboard and not single_cpu and not slow and not network and not db", "-n 2", "--no-strict-data-files"]); \
   pd.test(extra_args=["-m not clipboard and single_cpu and not slow and not network and not db", "--no-strict-data-files"]);' \
   """
+free-threaded-support = true
 before-build = "bash {package}/scripts/cibw_before_build.sh"
+before-test = "bash {package}/scripts/cibw_before_test.sh"
 
 [tool.cibuildwheel.windows]
 before-build = "pip install delvewheel"

scripts/cibw_before_test.sh

@@ -0,0 +1,8 @@
+# TODO: delete along with enabling build isolation by unsetting
+# CIBW_BUILD_FRONTEND when scipy is buildable under free-threaded
+# python with a released version of cython
+FREE_THREADED_BUILD="$(python -c "import sysconfig; print(bool(sysconfig.get_config_var('Py_GIL_DISABLED')))")"
+if [[ $FREE_THREADED_BUILD == "True" ]]; then
+    python -m pip install -U pip
+    python -m pip install -i https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy
+fi