binary tree tests added

tests/testutil.hpp

@@ -0,0 +1,16 @@
+#include <cstdio>
+
+namespace Test
+{
+void Execute(bool (*testFunction)(void), char const * const message)
+{
+	if(testFunction())
+	{
+		std::printf("[PASS] %s\n", message);
+	}
+	else
+	{
+		std::printf("[FAIL] %s\n", message);
+	}
+}
+};