test: Try to make it work on Windows

Author: jorisv

example/CMakeLists.txt

@@ -1,4 +1,15 @@
+function(ADD_WINDOWS_DLL_PATH_TO_TEST TEST_NAME)
+  if(WIN32)
+    get_test_property(${TEST_NAME} ENVIRONMENT ENV_VARIABLES)
+    list(APPEND ENV_VARIABLES
+         "PYCPPAD_WINDOWS_DLL_PATH=$<TARGET_FILE_DIR:${PROJECT_NAME}::${PROJECT_NAME}>")
+    set_tests_properties(${TEST_NAME} PROPERTIES ENVIRONMENT "${ENV_VARIABLES}")
+  endif()
+endfunction()
+
 ADD_PYTHON_UNIT_TEST("${PROJECT_NAME}-add_eq" "example/add_eq.py" "python")
+ADD_WINDOWS_DLL_PATH_TO_TEST(${PROJECT_NAME}-add_eq)
 IF(BUILD_WITH_CPPAD_CODEGEN_BINDINGS)
   ADD_PYTHON_UNIT_TEST("${PROJECT_NAME}-cppadcg_c_codegen" "example/cppadcg_c_codegen.py" "python")
+  ADD_WINDOWS_DLL_PATH_TO_TEST(${PROJECT_NAME}-cppadcg_c_codegen)
 ENDIF()