code: def test_zero_size_alloc(self):
      mem = self.pool.malloc(0).mem
      assert isinstance(mem, pinned_memory.PinnedMemory)
      assert not isinstance(mem, pinned_memory.PooledPinnedMemory)
  
imports: import unittest
  from cupy.cuda import pinned_memory
label_desc: Use image node_id 7 for calling the TestSingleDeviceMemoryPool obj's underlying member method code with example usage: obj.test_zero_size_alloc() without return types