@Test
public void testAdd() {

  MutateRowsRequest.Entry entry = createRequestEntry();
  underTest.add(entry);
  underTest.sendUnsent();
  MutateRowsRequest expected =
      MutateRowsRequest.newBuilder()
          .setTableName(TABLE_NAME.toString())
          .addEntries(entry)
          .build();
  verify(client, times(1)).mutateRowsAsync(eq(expected));
}