@Test
public void testHashCode(){

    assertThat(new PropertyValue( "k", "v").hashCode()).isEqualTo(new PropertyValue( "k", "v").hashCode());
    assertThat(new PropertyValue( "k", "v").hashCode()).isNotSameAs(new PropertyValue( "k1", "v").hashCode());
    assertThat(new PropertyValue( "k", "v").hashCode()).isNotSameAs(new PropertyValue( "k", "v1").hashCode());
    assertThat(new PropertyValue( "k", "v").hashCode()).isNotSameAs(new PropertyValue( "k", "v").hashCode());
}