from conflict_set import *


def test_conflict_set():
    with ConflictSet() as cs:
        before = cs.getBytes()
        key = b"a key"
        cs.addWrites(1, write(key))
        assert cs.getBytes() - before > 0
        assert cs.check(read(0, key)) == [Result.CONFLICT]
        cs.setOldestVersion(1)
        assert cs.check(read(0, key)) == [Result.TOO_OLD]