Reverb: Refactor method names to snake_case in tf_client_test.py.
Reverb: Refactor method names to snake_case in tf_client_test.py.

PiperOrigin-RevId: 309001187
Change-Id: I7ee8f642058869a84e0b63bb0c3cad16b95009f8

deepmind/reverb,deepmind/reverb,deepmind/reverb,deepmind/reverb