fn test_version_set_builder()

in common/rusty_leveldb_sgx/src/version_set.rs [1046:1088]

• 35 lines of code
• 1 McCabe index (conditional complexity)

    fn test_version_set_builder() {
        let (v, opt) = make_version();
        let v = share(v);

        let mut fmd = FileMetaData::default();
        fmd.num = 21;
        fmd.size = 123;
        fmd.smallest = LookupKey::new("klm".as_bytes(), 777)
            .internal_key()
            .to_vec();
        fmd.largest = LookupKey::new("kop".as_bytes(), 700)
            .internal_key()
            .to_vec();

        let mut ve = VersionEdit::new();
        ve.add_file(1, fmd);
        // This deletion should be undone by apply().
        ve.delete_file(1, 21);
        ve.delete_file(0, 2);
        ve.set_compact_pointer(2, LookupKey::new("xxx".as_bytes(), 123).internal_key());

        let mut b = Builder::new();
        let mut ptrs: [Vec<u8>; NUM_LEVELS] = Default::default();
        b.apply(&ve, &mut ptrs);

        assert_eq!(
            &[120 as u8, 120, 120, 1, 123, 0, 0, 0, 0, 0, 0],
            ptrs[2].as_slice()
        );
        assert_eq!(2, b.deleted[0][0]);
        assert_eq!(1, b.added[1].len());

        let mut v2 = Version::new(
            share(TableCache::new("db", opt.clone(), 100)),
            opt.cmp.clone(),
        );
        b.save_to(&InternalKeyCmp(opt.cmp.clone()), &v, &mut v2);
        // Second file in L0 was removed.
        assert_eq!(1, v2.files[0].len());
        // File was added to L1.
        assert_eq!(4, v2.files[1].len());
        assert_eq!(21, v2.files[1][3].borrow().num);
    }