code: def test_add_path(self):
      self._add_one_path()
  
      # HER buffer should add replay_k + 1 transitions to the buffer
      # for each transition in the given path. This doesn't apply to
      # the last transition, where only that transition gets added.
  
      path_len = 2
      total_expected_transitions = (
          sum([self._replay_k + 1 for _ in range(path_len - 1)]) + 1
      )
      assert (
          self.replay_buffer.n_transitions_stored
          == total_expected_transitions
      )
      assert (
          len(self.replay_buffer._path_segments)
          == total_expected_transitions - 1
      )
      # check that buffer has the correct keys
      assert {
          "observations",
          "next_observations",
          "actions",
          "rewards",
          "terminals",
      } <= set(self.replay_buffer._buffer)
  
      # check that dict obses are flattened
      obs = self.replay_buffer._buffer["observations"][0]
      next_obs = self.replay_buffer._buffer["next_observations"][0]
      assert obs.shape == self.env.spec.observation_space.flat_dim
      assert next_obs.shape == self.env.spec.observation_space.flat_dim
  
file_path: garage/tests/garage/replay_buffer/test_her_replay_buffer.py
imports: import pickle
  import numpy
  import pytest
  from garage.envs import GymEnv
  from garage.replay_buffer import HERReplayBuffer
  from tests.fixtures.envs.dummy import DummyDictEnv
label_desc: Use image node_id 4 for calling the TestHerReplayBuffer obj's underlying member method code with example usage: obj.test_add_path() without return types