Require numpy for the plugin tests in CI

.github/workflows/unit_tests.yml

@@ -44,6 +44,14 @@ jobs:
         uses: actions/download-artifact@v8
         with:
           name: ${{ inputs.artifact }}
+      # run_unit_tests.sh installs the plugin tests' numpy with the uv the build stages
+      # beside them; the Windows arm64 build bundles none, so put one on PATH there.
+      - name: Install uv
+        if: runner.os == 'Windows' && runner.arch == 'ARM64'
+        uses: astral-sh/setup-uv@v10.2.0
+        with:
+          version: "0.11.21"  # ORCA_UV_VERSION in CMakeLists.txt
+          enable-cache: false
       - uses: lukka/get-cmake@latest
         with:
           cmakeVersion: "~4.3.0"  # use most recent 4.3.x version

scripts/run_unit_tests.sh

@@ -2,7 +2,8 @@
 
 # This file is made to support the unit tests workflow.
 # It should only require the directories build/tests, scripts/, and tests/ to function,
-# and cmake (with ctest) installed.
+# and cmake (with ctest) installed -- plus network access to PyPI whenever numpy has to
+# be installed into a freshly built test tree (see below).
 # (otherwise, update the workflow too, but try to avoid to keep things self-contained)
 #
 # Usage: run_unit_tests.sh [TEST_DIR] [BUILD_CONFIG]
@@ -19,52 +20,48 @@ 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 no numpy,
-# so those tests SKIP without it. Install it into that interpreter's own site-packages --
-# no PYTHONPATH needed, and re-checked every run because a rebuild of the test target
-# wipes and re-copies the runtime. Needs network on the first run only; a failure here is
-# not fatal, the tests just keep skipping.
+# to the test binary (see tests/slic3rutils/CMakeLists.txt), which ships no numpy.
+# Install it with the uv staged beside that runtime -- the tool the app installs plugin
+# dependencies with -- straight into the interpreter's own site-packages: no pip needed
+# in the runtime, no PYTHONPATH. Re-checked every run because a rebuild of the test
+# target re-copies the runtime; needs network whenever it installs. Pinned so a numpy
+# release cannot change results on its own.
+NUMPY_VERSION="2.5.3"
+
+# Without numpy those tests assert the numpy-absent error path instead, so a local run
+# only warns. Under CI it fails the run, which would otherwise stay green while silently
+# dropping the array coverage. (The Flatpak leg runs this inside `flatpak build`, whose
+# minimal environment has no CI, and its offline build stages no uv, so numpy stays
+# best-effort there.)
+numpy_unavailable() {
+    if [ -n "${CI:-}" ]; then
+        echo "error: $1" >&2
+        exit 1
+    fi
+    echo "warning: $1; the numpy-backed binding tests will cover only the numpy-absent path."
+}
+
+has_pinned_numpy() {
+    "${python_exe}" -c "import sys, numpy; sys.exit(numpy.__version__ != '${NUMPY_VERSION}')" >/dev/null 2>&1
+}
+
 find_args=("${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."
+    numpy_unavailable "no bundled Python under ${TEST_DIR}"
+elif ! has_pinned_numpy; then
+    uv_exe="${python_exe%/python/*}/tools/uv/uv"
+    # Builds that bundle no uv (Windows arm64) fall back to one on PATH.
+    [ -x "${uv_exe}" ] || uv_exe="$(command -v uv)"
+    echo "Installing numpy ${NUMPY_VERSION} into the embedded test interpreter (${python_exe})..."
+    if [ -z "${uv_exe}" ]; then
+        numpy_unavailable "no uv staged beside the tests or on PATH"
+    elif ! "${uv_exe}" pip install --python "${python_exe}" --only-binary :all: "numpy==${NUMPY_VERSION}" \
+            || ! has_pinned_numpy; then
+        numpy_unavailable "could not install numpy ${NUMPY_VERSION} into ${python_exe}"
     fi
 fi
 

tests/slic3rutils/CMakeLists.txt

@@ -83,4 +83,16 @@ elseif (FLATPAK)
     )
 endif()
 
+# scripts/run_unit_tests.sh installs the tests' numpy into that runtime with this uv,
+# staged where the app build tree keeps it (<exe dir>/tools/uv, see src/CMakeLists.txt).
+if (ORCA_BUNDLED_UV_EXECUTABLE)
+    add_custom_command(TARGET ${_TEST_NAME}_tests POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E make_directory "$<TARGET_FILE_DIR:${_TEST_NAME}_tests>/tools/uv"
+        COMMAND ${CMAKE_COMMAND} -E copy_if_different "${ORCA_BUNDLED_UV_EXECUTABLE}"
+            "$<TARGET_FILE_DIR:${_TEST_NAME}_tests>/tools/uv/${ORCA_BUNDLED_UV_FILENAME}"
+        COMMENT "Copying uv for the plugin host API tests"
+        VERBATIM
+    )
+endif()
+
 orcaslicer_discover_tests(${_TEST_NAME}_tests)