@Test
public void testMutateRow() {

  RowMutation rowMutation = RowMutation.create(TABLE_ID, "key");
  MutateRowRequest mutateRowRequest = rowMutation.toProto(REQUEST_CONTEXT);
  when(client.mutateRow(mutateRowRequest)).thenReturn(MutateRowResponse.getDefaultInstance());
  clientWrapper.mutateRow(rowMutation);
  verify(client).mutateRow(mutateRowRequest);
}