message: tests: Add fuzzing harness for functions in primitives/block.h
diff: @@ -62,4 +62,8 @@ void test_one_input(const std::vector<uint8_t>& buffer)
  const size_t raw_memory_size = RecursiveDynamicUsage(block);
  const size_t raw_memory_size_as_shared_ptr = RecursiveDynamicUsage(std::make_shared<CBlock>(block));
  assert(raw_memory_size_as_shared_ptr > raw_memory_size);
  + CBlock block_copy = block;
  + block_copy.SetNull();
  + const bool is_null = block_copy.IsNull();
  + assert(is_null);
  }
  