src/libcoretest/cmp.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 core::cmp::{partial_min, partial_max};
  12 use core::cmp::Ordering::{Less, Greater, Equal};
  13
  14 #[test]
  15 fn test_int_totalord() {
  16     assert_eq!(5.cmp(&10), Less);
  17     assert_eq!(10.cmp(&5), Greater);
  18     assert_eq!(5.cmp(&5), Equal);
  19     assert_eq!((-5).cmp(&12), Less);
  20     assert_eq!(12.cmp(&-5), Greater);
  21 }
  22
  23 #[test]
  24 fn test_mut_int_totalord() {
  25     assert_eq!((&mut 5).cmp(&&mut 10), Less);
  26     assert_eq!((&mut 10).cmp(&&mut 5), Greater);
  27     assert_eq!((&mut 5).cmp(&&mut 5), Equal);
  28     assert_eq!((&mut -5).cmp(&&mut 12), Less);
  29     assert_eq!((&mut 12).cmp(&&mut -5), Greater);
  30 }
  31
  32 #[test]
  33 fn test_ordering_reverse() {
  34     assert_eq!(Less.reverse(), Greater);
  35     assert_eq!(Equal.reverse(), Equal);
  36     assert_eq!(Greater.reverse(), Less);
  37 }
  38
  39 #[test]
  40 fn test_ordering_order() {
  41     assert!(Less < Equal);
  42     assert_eq!(Greater.cmp(&Less), Greater);
  43 }
  44
  45 #[test]
  46 fn test_partial_min() {
  47     use core::f64::NAN;
  48     let data_integer = [
  49         // a, b, result
  50         (0, 0, Some(0)),
  51         (1, 0, Some(0)),
  52         (0, 1, Some(0)),
  53         (-1, 0, Some(-1)),
  54         (0, -1, Some(-1))
  55     ];
  56
  57     let data_float = [
  58         // a, b, result
  59         (0.0f64, 0.0f64, Some(0.0f64)),
  60         (1.0f64, 0.0f64, Some(0.0f64)),
  61         (0.0f64, 1.0f64, Some(0.0f64)),
  62         (-1.0f64, 0.0f64, Some(-1.0f64)),
  63         (0.0f64, -1.0f64, Some(-1.0f64)),
  64         (NAN, NAN, None),
  65         (NAN, 1.0f64, None),
  66         (1.0f64, NAN, None)
  67     ];
  68
  69     for &(a, b, result) in &data_integer {
  70         assert!(partial_min(a, b) == result);
  71     }
  72
  73     for &(a, b, result) in &data_float {
  74         assert!(partial_min(a, b) == result);
  75     }
  76 }
  77
  78 #[test]
  79 fn test_partial_max() {
  80     use core::f64::NAN;
  81     let data_integer = [
  82         // a, b, result
  83         (0, 0, Some(0)),
  84         (1, 0, Some(1)),
  85         (0, 1, Some(1)),
  86         (-1, 0, Some(0)),
  87         (0, -1, Some(0))
  88     ];
  89
  90     let data_float = [
  91         // a, b, result
  92         (0.0f64, 0.0f64, Some(0.0f64)),
  93         (1.0f64, 0.0f64, Some(1.0f64)),
  94         (0.0f64, 1.0f64, Some(1.0f64)),
  95         (-1.0f64, 0.0f64, Some(0.0f64)),
  96         (0.0f64, -1.0f64, Some(0.0f64)),
  97         (NAN, NAN, None),
  98         (NAN, 1.0f64, None),
  99         (1.0f64, NAN, None)
 100     ];
 101
 102     for &(a, b, result) in &data_integer {
 103         assert!(partial_max(a, b) == result);
 104     }
 105
 106     for &(a, b, result) in &data_float {
 107         assert!(partial_max(a, b) == result);
 108     }
 109 }
 110
 111 #[test]
 112 fn test_user_defined_eq() {
 113     // Our type.
 114     struct SketchyNum {
 115         num : isize
 116     }
 117
 118     // Our implementation of `PartialEq` to support `==` and `!=`.
 119     impl PartialEq for SketchyNum {
 120         // Our custom eq allows numbers which are near each other to be equal! :D
 121         fn eq(&self, other: &SketchyNum) -> bool {
 122             (self.num - other.num).abs() < 5
 123         }
 124     }
 125
 126     // Now these binary operators will work when applied!
 127     assert!(SketchyNum {num: 37} == SketchyNum {num: 34});
 128     assert!(SketchyNum {num: 25} != SketchyNum {num: 57});
 129 }