fix Windows

scripts/run_unit_tests.sh

@@ -18,21 +18,53 @@ TEST_DIR="${1:-build/tests}"
 BUILD_CONFIG="${2:-}"
 
 # The slic3rutils plugin-host tests build numpy arrays through the CPython copied next
-# to the test binary (see tests/slic3rutils/CMakeLists.txt); that runtime ships pip but
+# to the test binary (see tests/slic3rutils/CMakeLists.txt); that runtime ships no numpy,
-# no numpy, so those tests SKIP without it. Install it into that interpreter's own
+# so those tests SKIP without it. Install it into that interpreter's own site-packages --
-# site-packages -- no PYTHONPATH needed, and re-checked every run because a rebuild of
+# no PYTHONPATH needed, and re-checked every run because a rebuild of the test target
-# the test target wipes and re-copies the runtime. Needs network on the first run only;
+# wipes and re-copies the runtime. Needs network on the first run only; a failure here is
-# a failure here is not fatal, the tests just keep skipping.
+# not fatal, the tests just keep skipping.
 find_args=("${TEST_DIR}" \( -path '*/python/bin/python3' -o -path '*/python/python.exe' \))
 # Multi-config trees hold one copy per configuration; only bootstrap the one being run.
 [ -n "${BUILD_CONFIG}" ] && find_args+=(-path "*/${BUILD_CONFIG}/*")
 python_exe="$(find "${find_args[@]}" -print -quit 2>/dev/null)"
+
+# Unix stages the runtime with `make install`, which runs ensurepip; the Windows layout
+# (deps/python3/stage_windows.cmake) ships no pip, so drive the install from whatever pip
+# the host has, resolving wheels for the embedded interpreter's tags and not the host's.
+install_numpy_from_host_pip() {
+    local py_ver py_abi py_plat py_site host_py
+    # tr strips the CR that a Windows interpreter's print() puts on every line.
+    { read -r py_ver; read -r py_abi; read -r py_plat; read -r py_site; } < <(
+        "${python_exe}" -c 'import sys, sysconfig
+v = sys.version_info
+print("%d.%d" % v[:2])
+print("cp%d%d" % v[:2])
+print(sysconfig.get_platform().replace("-", "_").replace(".", "_"))
+print(sysconfig.get_paths()["purelib"])' 2>/dev/null | tr -d '\r')
+    [ -n "${py_site}" ] || return 1
+    for host_py in python3 python py; do
+        # Skips a Windows Store stub, which resolves but has no pip behind it.
+        "${host_py}" -m pip --version >/dev/null 2>&1 || continue
+        "${host_py}" -m pip install --quiet --disable-pip-version-check --retries 1 \
+            --target "${py_site}" --only-binary=:all: --implementation cp \
+            --python-version "${py_ver}" --abi "${py_abi}" --platform "${py_plat}" \
+            "numpy<3"
+        return $?
+    done
+    return 1
+}
+
 if [ -z "${python_exe}" ]; then
     echo "No bundled Python under ${TEST_DIR}; numpy-backed binding tests will skip."
 elif ! "${python_exe}" -c "import numpy" >/dev/null 2>&1; then
     echo "Installing numpy into the embedded test interpreter (${python_exe})..."
+    if "${python_exe}" -m pip --version >/dev/null 2>&1; then
         "${python_exe}" -m pip install --quiet --disable-pip-version-check --retries 1 "numpy<3" \
             || echo "numpy install failed; numpy-backed binding tests will skip."
+    else
+        install_numpy_from_host_pip \
+            || echo "numpy install failed; numpy-backed binding tests will skip."
+    fi
 fi
 
 # Run the whole suite, excluding tests tagged [NotWorking].