@Test
void shouldHaveMethodToGetKeys()
{

    //GIVEN
    List<String> keys = Arrays.asList( "k2", "k1" );
    InternalRecord record =  new InternalRecord( keys, new Value[]{value( 0 ), value( 1 )} );
    //WHEN
    List<String> appendedKeys = record.keys();
    //THEN
    assertThat( appendedKeys, equalTo( keys ) );
}