add paths for windows in test environment

tests/stubs/plugins.cc

@@ -1,7 +1,16 @@
 #include "plugins.h"
 #include "python_module.h"
 
-Plugins::Plugins() : jucipp_module("Jucipp", Module::init_jucipp_module) {}
+Plugins::Plugins() : jucipp_module("Jucipp", Module::init_jucipp_module) {
+#ifdef PYTHON_HOME_DIR
+#ifdef _WIN32
+  const std::wstring python_home(PYTHON_HOME_DIR);
+  const std::wstring python_path(python_home + L";" + python_home + L"\\lib-dynload;" + python_home + L"\\site-packages" );
+  Py_SetPythonHome(python_home.c_str());
+  Py_SetPath(python_path.c_str());
+#endif
+#endif
+}
 
 void Plugins::load() {}