@Test
public void testEquals() {

    assertThat(newSample())
            .isEqualTo(newSample())
            .isNotSameAs(newSample())
            .isNotEqualTo(ZERO)
            .isEqualTo(new DataSource(PNAME, VERSION, ImmutableSortedMap.of(K3, V3, K2, V2, K1, V1)));
}