class_docstr: This class tests all member functions of crypten package
code: def test_broadcast(self) -> None:
      for rank in range(self.world_size):
          tensor = torch.tensor([0], dtype=torch.long)
          if self.rank == rank:
              tensor += 1
  
          tensor = comm.get().broadcast(tensor, rank)
          self.assertTrue(torch.is_tensor(tensor))
          self.assertEqual(tensor.item(), 1)
  
imports: import unittest
  import crypten
  import crypten.communicator
  import numpy
  import torch
  import torch.distributed
  import torch.nn
  import torch.nn.functional
  from crypten.common import serial
  from crypten.config import cfg
  from test.multiprocess_test_case import get_random_test_tensor, MultiProcessTestCase
label_desc: Use image node_id 10 for calling the TestCommunicator obj's underlying member method code with example usage: obj.test_broadcast() without return types