From 525a16177c643bb509ca3d7734fe9e5953002913 Mon Sep 17 00:00:00 2001
From: Ian Chua <iancrb00@gmail.com>
Date: Thu, 16 Jul 2026 12:06:45 +0800
Subject: [PATCH 1/2] fix: bundle python runtime for macos plugin tests

---
 tests/slic3rutils/CMakeLists.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tests/slic3rutils/CMakeLists.txt b/tests/slic3rutils/CMakeLists.txt
index 429d3582df..ead5846c11 100644
--- a/tests/slic3rutils/CMakeLists.txt
+++ b/tests/slic3rutils/CMakeLists.txt
@@ -29,6 +29,19 @@ if (WIN32)
         COMMENT "Copying Python runtime for slic3rutils plugin host API tests"
         VERBATIM
     )
+elseif (APPLE)
+    target_link_options(${_TEST_NAME}_tests PRIVATE
+        "LINKER:-rpath,@executable_path/python/lib")
+
+    add_custom_command(TARGET ${_TEST_NAME}_tests POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E rm -rf
+            "$<TARGET_FILE_DIR:${_TEST_NAME}_tests>/python"
+        COMMAND ${CMAKE_COMMAND} -E copy_directory
+            "${CMAKE_PREFIX_PATH}/libpython"
+            "$<TARGET_FILE_DIR:${_TEST_NAME}_tests>/python"
+        COMMENT "Copying Python runtime for macOS plugin host API tests"
+        VERBATIM
+    )
 endif()
 
 orcaslicer_discover_tests(${_TEST_NAME}_tests)

From 49396699e7fa70b04978f5fe7f41080973c1eec0 Mon Sep 17 00:00:00 2001
From: Ian Chua <iancrb00@gmail.com>
Date: Thu, 16 Jul 2026 15:40:13 +0800
Subject: [PATCH 2/2] fix: initialize embedded python from bundled runtime

---
 tests/slic3rutils/python_test_support.hpp | 37 ++++++++++++++++-------
 1 file changed, 26 insertions(+), 11 deletions(-)

diff --git a/tests/slic3rutils/python_test_support.hpp b/tests/slic3rutils/python_test_support.hpp
index 1920b2ce2a..ab66f05887 100644
--- a/tests/slic3rutils/python_test_support.hpp
+++ b/tests/slic3rutils/python_test_support.hpp
@@ -2,7 +2,10 @@
 
 // Shared embedded-interpreter bootstrap for slic3rutils tests that need a live Python
 // interpreter (test_plugin_host_api.cpp, test_slicing_pipeline_bindings.cpp, ...).
-
+#include <boost/dll/runtime_symbol_info.hpp>
+#include <boost/filesystem.hpp>
+#include <memory.h>
+#include <stdexcept>
 #include <pybind11/embed.h>
 #include <pybind11/pybind11.h>
 
@@ -12,17 +15,29 @@ namespace {
 
 void ensure_python_initialized()
 {
-    // Deliberately a bare scoped_interpreter rather than Slic3r::PythonInterpreter:
-    // `orca` is a PYBIND11_EMBEDDED_MODULE compiled into this test binary, so importing
-    // it needs no bundled stdlib/sys.path, and the deterministic assertions are
-    // independent of the host's Python. PythonInterpreter::initialize() expects the
-    // bundled Python home laid out next to the app bundle (lib/python3.12/encodings),
-    // which is not deployed beside the test binary, so using it here would fail to find
-    // a home on macOS/Linux. The optional numpy-backed assertions are guarded at runtime.
-    if (!Py_IsInitialized()) {
-        static pybind11::scoped_interpreter interpreter;
-        (void) interpreter;
+    if (Py_IsInitialized())
+        return;
+
+    static std::unique_ptr<pybind11::scoped_interpreter> interpreter;
+
+    PyConfig config;
+    PyConfig_InitPythonConfig(&config);
+    config.parse_argv = 0;
+
+    const auto python_home = boost::dll::program_location().parent_path() / "python";
+
+    if (boost::filesystem::exists(python_home)) {
+        const std::string home = python_home.string();
+        const PyStatus status  = PyConfig_SetBytesString(&config, &config.home, home.c_str());
+
+        if (PyStatus_Exception(status)) {
+            const char* message = status.err_msg ? status.err_msg : "Failed to set Python home";
+            PyConfig_Clear(&config);
+            throw std::runtime_error(message);
+        }
     }
+
+    interpreter = std::make_unique<pybind11::scoped_interpreter>(&config);
 }
 
 pybind11::module_ import_orca_module()