Testing 3mf reading file with umlauts in it's path

src/CMakeLists.txt

@@ -154,6 +154,7 @@ set(SLIC3R_INCLUDES
 )
 set(LIBSLIC3R_INCLUDES
     ${LIBDIR}/libslic3r
+    ${LIBDIR}/libslic3r/IO
 )
 
 
@@ -313,6 +314,7 @@ set(SLIC3R_TEST_SOURCES
     ${TESTDIR}/libslic3r/test_skirt_brim.cpp
     ${TESTDIR}/libslic3r/test_test_data.cpp
     ${TESTDIR}/libslic3r/test_trianglemesh.cpp
+    ${TESTDIR}/libslic3r/test_3mf.cpp
 )
 
 

src/test/libslic3r/test_3mf.cpp

@@ -0,0 +1,20 @@
+#include <catch.hpp>
+#include <test_options.hpp>
+#include <string>
+#include "Model.hpp"
+#include "TMF.hpp"
+
+
+using namespace Slic3r;
+
+SCENARIO("Reading 3mf file") {
+    GIVEN("umlauts in the path of the file") {
+         auto model {new Slic3r::Model()};
+        WHEN("3mf model is read") {
+            auto ret = Slic3r::IO::TMF::read(std::string(testfile_dir) +"test_3mf/Geräte/box.3mf",model);
+            THEN("read should not return 0") {
+                REQUIRE(ret == 1);
+            }
+        }
+    }
+}