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use super::SnapshotMap;
#[test]
fn basic() {
let mut map = SnapshotMap::default();
map.insert(22, "twenty-two");
let snapshot = map.snapshot();
map.insert(22, "thirty-three");
assert_eq!(map[&22], "thirty-three");
map.insert(44, "forty-four");
assert_eq!(map[&44], "forty-four");
assert_eq!(map.get(&33), None);
map.rollback_to(snapshot);
assert_eq!(map[&22], "twenty-two");
assert_eq!(map.get(&33), None);
assert_eq!(map.get(&44), None);
}
#[test]
#[should_panic]
fn out_of_order() {
let mut map = SnapshotMap::default();
map.insert(22, "twenty-two");
let snapshot1 = map.snapshot();
map.insert(33, "thirty-three");
let snapshot2 = map.snapshot();
map.insert(44, "forty-four");
map.rollback_to(snapshot1); // bogus, but accepted
map.rollback_to(snapshot2); // asserts
}
#[test]
fn nested_commit_then_rollback() {
let mut map = SnapshotMap::default();
map.insert(22, "twenty-two");
let snapshot1 = map.snapshot();
let snapshot2 = map.snapshot();
map.insert(22, "thirty-three");
map.commit(snapshot2);
assert_eq!(map[&22], "thirty-three");
map.rollback_to(snapshot1);
assert_eq!(map[&22], "twenty-two");
}
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