fix: forgot to add compare_test.cpp to CMake

test/unit_test/static/CMakeLists.txt

@@ -33,6 +33,7 @@ add_library(
     angular_test.cpp
     cgs_test.cpp
     chrono_test.cpp
+    compare_test.cpp
     concepts_test.cpp
     # custom_rep_test_min_expl.cpp
     custom_rep_test_min_impl.cpp