src/libcore/tests/cmp.rs

   1 use core::cmp::Ordering::{Less, Greater, Equal};
   2
   3 #[test]
   4 fn test_int_totalord() {
   5     assert_eq!(5.cmp(&10), Less);
   6     assert_eq!(10.cmp(&5), Greater);
   7     assert_eq!(5.cmp(&5), Equal);
   8     assert_eq!((-5).cmp(&12), Less);
   9     assert_eq!(12.cmp(&-5), Greater);
  10 }
  11
  12 #[test]
  13 fn test_mut_int_totalord() {
  14     assert_eq!((&mut 5).cmp(&&mut 10), Less);
  15     assert_eq!((&mut 10).cmp(&&mut 5), Greater);
  16     assert_eq!((&mut 5).cmp(&&mut 5), Equal);
  17     assert_eq!((&mut -5).cmp(&&mut 12), Less);
  18     assert_eq!((&mut 12).cmp(&&mut -5), Greater);
  19 }
  20
  21 #[test]
  22 fn test_ord_max_min() {
  23     assert_eq!(1.max(2), 2);
  24     assert_eq!(2.max(1), 2);
  25     assert_eq!(1.min(2), 1);
  26     assert_eq!(2.min(1), 1);
  27     assert_eq!(1.max(1), 1);
  28     assert_eq!(1.min(1), 1);
  29 }
  30
  31 #[test]
  32 fn test_ordering_reverse() {
  33     assert_eq!(Less.reverse(), Greater);
  34     assert_eq!(Equal.reverse(), Equal);
  35     assert_eq!(Greater.reverse(), Less);
  36 }
  37
  38 #[test]
  39 fn test_ordering_order() {
  40     assert!(Less < Equal);
  41     assert_eq!(Greater.cmp(&Less), Greater);
  42 }
  43
  44 #[test]
  45 fn test_ordering_then() {
  46     assert_eq!(Equal.then(Less), Less);
  47     assert_eq!(Equal.then(Equal), Equal);
  48     assert_eq!(Equal.then(Greater), Greater);
  49     assert_eq!(Less.then(Less), Less);
  50     assert_eq!(Less.then(Equal), Less);
  51     assert_eq!(Less.then(Greater), Less);
  52     assert_eq!(Greater.then(Less), Greater);
  53     assert_eq!(Greater.then(Equal), Greater);
  54     assert_eq!(Greater.then(Greater), Greater);
  55 }
  56
  57 #[test]
  58 fn test_ordering_then_with() {
  59     assert_eq!(Equal.then_with(|| Less), Less);
  60     assert_eq!(Equal.then_with(|| Equal), Equal);
  61     assert_eq!(Equal.then_with(|| Greater), Greater);
  62     assert_eq!(Less.then_with(|| Less), Less);
  63     assert_eq!(Less.then_with(|| Equal), Less);
  64     assert_eq!(Less.then_with(|| Greater), Less);
  65     assert_eq!(Greater.then_with(|| Less), Greater);
  66     assert_eq!(Greater.then_with(|| Equal), Greater);
  67     assert_eq!(Greater.then_with(|| Greater), Greater);
  68 }
  69
  70 #[test]
  71 fn test_user_defined_eq() {
  72     // Our type.
  73     struct SketchyNum {
  74         num : isize
  75     }
  76
  77     // Our implementation of `PartialEq` to support `==` and `!=`.
  78     impl PartialEq for SketchyNum {
  79         // Our custom eq allows numbers which are near each other to be equal! :D
  80         fn eq(&self, other: &SketchyNum) -> bool {
  81             (self.num - other.num).abs() < 5
  82         }
  83     }
  84
  85     // Now these binary operators will work when applied!
  86     assert!(SketchyNum {num: 37} == SketchyNum {num: 34});
  87     assert!(SketchyNum {num: 25} != SketchyNum {num: 57});
  88 }