Add some tests

src/util/memory.c

@@ -7,6 +7,7 @@
 
 #include "memory.h"
 #include "assert/assert.h"
+#include "util/math.h"
 
 void * memoryAllocate(const size_t size) {
   assertTrue(size > 0, "Cannot allocate 0 bytes of memory.");
@@ -83,14 +84,13 @@ void memoryReallocate(void **ptr, const size_t size) {
 
 void memoryResize(void **ptr, const size_t oldSize, const size_t newSize) {
   assertNotNull(ptr, "Cannot resize NULL pointer.");
+  assertTrue(newSize > 0, "Cannot resize to 0 bytes of memory.");
+  assertTrue(oldSize > 0, "Old size cannot be 0 bytes.");
   if(newSize == oldSize) return;
-  if(oldSize == 0) return memoryReallocate(ptr, newSize);
-
-  assertTrue(newSize > oldSize, "New size must be greater than old size.");
 
   void *newPointer = memoryAllocate(newSize);
   assertNotNull(newPointer, "Memory resizing failed.");
-  memoryCopy(newPointer, *ptr, oldSize);
+  memoryCopy(newPointer, *ptr, mathMin(oldSize, newSize));
   memoryFree(*ptr);
   *ptr = newPointer;
 }