tests: Assert on out-of-memory in tests

This should never happen but can improve debugging experience for
work-in-progress changes since that avoids memcpy() into negative memory
space (debugger can't backtrace from failed memcpy since it does not set
up the stack frame).

git-svn-id: https://pugixml.googlecode.com/svn/trunk@1070 99668b35-9821-0410-8761-19e4c4f06640

tests/allocator.cpp

@@ -1,6 +1,7 @@
 #include "allocator.hpp"
 
 #include <string.h>
+#include <assert.h>
 
 // Low-level allocation functions
 #if defined(_WIN32) || defined(_WIN64)
@@ -97,6 +98,8 @@ void* memory_allocate(size_t size)
 
 size_t memory_size(void* ptr)
 {
+	assert(ptr);
+
 	size_t result;
 	memcpy(&result, static_cast<size_t*>(ptr) - 1, sizeof(size_t));
 

tests/main.cpp

@@ -34,6 +34,7 @@ static void* custom_allocate(size_t size)
 	else
 	{
 		void* ptr = memory_allocate(size);
+		assert(ptr);
 
 		g_memory_total_size += memory_size(ptr);
 		g_memory_total_count++;