@Test
public void testToString() {

  String abstractTableToStr = connection.toString();
  assertThat(abstractTableToStr, containsString("project=" + PROJECT_ID));
  assertThat(abstractTableToStr, containsString("instance=" + INSTANCE_ID));
  assertThat(abstractTableToStr, containsString("dataHost=" + HOST_NAME));
  assertThat(abstractTableToStr, containsString("tableAdminHost=" + HOST_NAME));
}