src/librustc_data_structures/snapshot_map/test.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 use super::SnapshotMap;
  12
  13 #[test]
  14 fn basic() {
  15     let mut map = SnapshotMap::default();
  16     map.insert(22, "twenty-two");
  17     let snapshot = map.snapshot();
  18     map.insert(22, "thirty-three");
  19     assert_eq!(map[&22], "thirty-three");
  20     map.insert(44, "fourty-four");
  21     assert_eq!(map[&44], "fourty-four");
  22     assert_eq!(map.get(&33), None);
  23     map.rollback_to(&snapshot);
  24     assert_eq!(map[&22], "twenty-two");
  25     assert_eq!(map.get(&33), None);
  26     assert_eq!(map.get(&44), None);
  27 }
  28
  29 #[test]
  30 #[should_panic]
  31 fn out_of_order() {
  32     let mut map = SnapshotMap::default();
  33     map.insert(22, "twenty-two");
  34     let snapshot1 = map.snapshot();
  35     let _snapshot2 = map.snapshot();
  36     map.rollback_to(&snapshot1);
  37 }
  38
  39 #[test]
  40 fn nested_commit_then_rollback() {
  41     let mut map = SnapshotMap::default();
  42     map.insert(22, "twenty-two");
  43     let snapshot1 = map.snapshot();
  44     let snapshot2 = map.snapshot();
  45     map.insert(22, "thirty-three");
  46     map.commit(&snapshot2);
  47     assert_eq!(map[&22], "thirty-three");
  48     map.rollback_to(&snapshot1);
  49     assert_eq!(map[&22], "twenty-two");
  50 }