added test

sample/main.cpp

@@ -0,0 +1,34 @@
+// Copyright (c) Lysann Tranvouez.  All rights reserved.
+
+#include <cassert>
+
+#include "mach_detours.h"
+
+#include <cstring>
+
+char* (*real_strerror)(int errno) = strerror;
+
+static int counter = 0;
+
+char* my_strerror(const int errno)
+{
+    counter++;
+    return real_strerror(errno);
+}
+
+int main(int argc, const char* argv[])
+{
+    counter = 0;
+    strerror(0);
+    assert(counter == 0);
+
+    detour_transaction_begin();
+    detour_attach(reinterpret_cast<detour_func_t*>(&real_strerror), reinterpret_cast<detour_func_t>(my_strerror));
+    detour_transaction_commit();
+
+    assert(counter == 0);
+    strerror(0);
+    assert(counter == 1);
+
+    return 0;
+}