diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
--- a/src/tests/CMakeLists.txt
+++ b/src/tests/CMakeLists.txt
@@ -1,3 +1,5 @@
-add_files(
-    landscape_partial_pixel_z.h
+add_test_files(
+    landscape_partial_pixel_z.cpp
+    math_func.cpp
+    test_main.cpp
 )