Fix testing mechanism.

test/matrixScalarMult.cpp

@@ -1,7 +1,7 @@
-#include <assert.h>
 #include <stdio.h>
 
 #include <matrix/math.hpp>
+#include "test_macros.hpp"
 
 using namespace matrix;
 
@@ -12,9 +12,7 @@ int main()
     A = A * 2;
     float data_check[9] = {2, 4, 6, 8, 10, 12, 14, 16, 18};
     Matrix3f A_check(data_check);
-    A.print();
-    A_check.print();
-    assert(A == A_check);
+    TEST(isEqual(A, A_check));
     return 0;
 }