@Test
public void testHashCode() {

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