diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index da2c1de..19c4daf 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -11,11 +11,11 @@ if(NOT DOCTEST_LIB)
   FetchContent_MakeAvailable(DocTest)
 endif()
 
-add_executable(testTug setup.cpp testSimulation.cpp testGrid.cpp testFTCS.cpp)
+add_executable(testTug setup.cpp testSimulation.cpp testGrid.cpp testFTCS.cpp testBoundary.cpp)
 target_link_libraries(testTug doctest tug)
 
 # get relative path of the CSV file
-get_filename_component(testSimulationCSV "FTCS_11_11_7000.csv" REALPATH CACHE)
+get_filename_component(testSimulationCSV "FTCS_11_11_7000.csv" REALPATH)
 # set relative path in header file
 configure_file(testSimulation.hpp.in testSimulation.hpp)
 # include test directory with generated header file from above
diff --git a/test/testBoundary.cpp b/test/testBoundary.cpp
index 7d7fe46..1d2bff2 100644
--- a/test/testBoundary.cpp
+++ b/test/testBoundary.cpp
@@ -13,7 +13,7 @@ TEST_CASE("BoundaryElement") {
     BoundaryElement boundaryElementClosed = BoundaryElement();
     CHECK_NOTHROW(BoundaryElement());
     CHECK_EQ(boundaryElementClosed.getType(), BC_TYPE_CLOSED);
-    CHECK_EQ(isnan(boundaryElementClosed.getValue()), isnan(NAN));
+    CHECK_EQ(boundaryElementClosed.getValue(), -1);
     CHECK_THROWS(boundaryElementClosed.setValue(0.2));
   }