Class InvalidAllocator

tests/node_test.cpp:767–774

invalid allocator which only allocate nullptr

// invalid allocator which only allocate nullptr
class InvalidAllocator {
 public:
  static void* Malloc(size_t) { return nullptr; }
  static void* Realloc(void*, size_t, size_t) { return nullptr; }

  static void Free(void*) { return; }
  static constexpr bool kNeedFree = true;
};

TEST(DNodeTest, AllocatorReturnNull) {
  using NodeType = DNode<InvalidAllocator>;