diff --git a/cpp/tests/lib.hpp b/cpp/tests/lib.hpp
index 9e2e994..ee73b0e 100644
--- a/cpp/tests/lib.hpp
+++ b/cpp/tests/lib.hpp
@@ -4,9 +4,11 @@
 
 #define ASSERT_EQUALS(expected, actual)                                        \
     {                                                                          \
-        if (expected != actual)                                                \
-            std::cout << "Expected: " << std::endl                             \
+        if (expected != actual) {                                              \
+            std::cerr << "Expected: " << std::endl                             \
                       << '\t' << expected << std::endl                         \
                       << "Got: " << std::endl                                  \
                       << '\t' << actual << std::endl;                          \
+            exit(1);                                                           \
+        }                                                                      \
     }