@Test
@SuppressWarnings("null")
public void testOf() {

    assertThatThrownBy(() -> DataSource.of(null, VERSION)).isInstanceOf(NullPointerException.class);
    assertThatThrownBy(() -> DataSource.of(PNAME, null)).isInstanceOf(NullPointerException.class);
    assertThat(DataSource.of(PNAME, VERSION)).isEqualTo(ZERO);
}