src/libcore/tests/num/uint_macros.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 macro_rules! uint_module { ($T:ident, $T_i:ident) => (
  12 #[cfg(test)]
  13 mod tests {
  14     use core::$T_i::*;
  15     use num;
  16     use core::ops::{BitOr, BitAnd, BitXor, Shl, Shr, Not};
  17     use std::str::FromStr;
  18     use std::mem;
  19
  20     #[test]
  21     fn test_overflows() {
  22         assert!(MAX > 0);
  23         assert!(MIN <= 0);
  24         assert!((MIN + MAX).wrapping_add(1) == 0);
  25     }
  26
  27     #[test]
  28     fn test_num() {
  29         num::test_num(10 as $T, 2 as $T);
  30     }
  31
  32     #[test]
  33     fn test_bitwise_operators() {
  34         assert!(0b1110 as $T == (0b1100 as $T).bitor(0b1010 as $T));
  35         assert!(0b1000 as $T == (0b1100 as $T).bitand(0b1010 as $T));
  36         assert!(0b0110 as $T == (0b1100 as $T).bitxor(0b1010 as $T));
  37         assert!(0b1110 as $T == (0b0111 as $T).shl(1));
  38         assert!(0b0111 as $T == (0b1110 as $T).shr(1));
  39         assert!(MAX - (0b1011 as $T) == (0b1011 as $T).not());
  40     }
  41
  42     const A: $T = 0b0101100;
  43     const B: $T = 0b0100001;
  44     const C: $T = 0b1111001;
  45
  46     const _0: $T = 0;
  47     const _1: $T = !0;
  48
  49     #[test]
  50     fn test_count_ones() {
  51         assert!(A.count_ones() == 3);
  52         assert!(B.count_ones() == 2);
  53         assert!(C.count_ones() == 5);
  54     }
  55
  56     #[test]
  57     fn test_count_zeros() {
  58         let bits = mem::size_of::<$T>() * 8;
  59         assert!(A.count_zeros() == bits as u32 - 3);
  60         assert!(B.count_zeros() == bits as u32 - 2);
  61         assert!(C.count_zeros() == bits as u32 - 5);
  62     }
  63
  64     #[test]
  65     fn test_rotate() {
  66         assert_eq!(A.rotate_left(6).rotate_right(2).rotate_right(4), A);
  67         assert_eq!(B.rotate_left(3).rotate_left(2).rotate_right(5), B);
  68         assert_eq!(C.rotate_left(6).rotate_right(2).rotate_right(4), C);
  69
  70         // Rotating these should make no difference
  71         //
  72         // We test using 124 bits because to ensure that overlong bit shifts do
  73         // not cause undefined behaviour. See #10183.
  74         assert_eq!(_0.rotate_left(124), _0);
  75         assert_eq!(_1.rotate_left(124), _1);
  76         assert_eq!(_0.rotate_right(124), _0);
  77         assert_eq!(_1.rotate_right(124), _1);
  78
  79         // Rotating by 0 should have no effect
  80         assert_eq!(A.rotate_left(0), A);
  81         assert_eq!(B.rotate_left(0), B);
  82         assert_eq!(C.rotate_left(0), C);
  83         // Rotating by a multiple of word size should also have no effect
  84         assert_eq!(A.rotate_left(64), A);
  85         assert_eq!(B.rotate_left(64), B);
  86         assert_eq!(C.rotate_left(64), C);
  87     }
  88
  89     #[test]
  90     fn test_swap_bytes() {
  91         assert_eq!(A.swap_bytes().swap_bytes(), A);
  92         assert_eq!(B.swap_bytes().swap_bytes(), B);
  93         assert_eq!(C.swap_bytes().swap_bytes(), C);
  94
  95         // Swapping these should make no difference
  96         assert_eq!(_0.swap_bytes(), _0);
  97         assert_eq!(_1.swap_bytes(), _1);
  98     }
  99
 100     #[test]
 101     fn test_reverse_bits() {
 102         assert_eq!(A.reverse_bits().reverse_bits(), A);
 103         assert_eq!(B.reverse_bits().reverse_bits(), B);
 104         assert_eq!(C.reverse_bits().reverse_bits(), C);
 105
 106         // Swapping these should make no difference
 107         assert_eq!(_0.reverse_bits(), _0);
 108         assert_eq!(_1.reverse_bits(), _1);
 109     }
 110
 111     #[test]
 112     fn test_le() {
 113         assert_eq!($T::from_le(A.to_le()), A);
 114         assert_eq!($T::from_le(B.to_le()), B);
 115         assert_eq!($T::from_le(C.to_le()), C);
 116         assert_eq!($T::from_le(_0), _0);
 117         assert_eq!($T::from_le(_1), _1);
 118         assert_eq!(_0.to_le(), _0);
 119         assert_eq!(_1.to_le(), _1);
 120     }
 121
 122     #[test]
 123     fn test_be() {
 124         assert_eq!($T::from_be(A.to_be()), A);
 125         assert_eq!($T::from_be(B.to_be()), B);
 126         assert_eq!($T::from_be(C.to_be()), C);
 127         assert_eq!($T::from_be(_0), _0);
 128         assert_eq!($T::from_be(_1), _1);
 129         assert_eq!(_0.to_be(), _0);
 130         assert_eq!(_1.to_be(), _1);
 131     }
 132
 133     #[test]
 134     fn test_unsigned_checked_div() {
 135         assert!((10 as $T).checked_div(2) == Some(5));
 136         assert!((5 as $T).checked_div(0) == None);
 137     }
 138
 139     fn from_str<T: FromStr>(t: &str) -> Option<T> {
 140         FromStr::from_str(t).ok()
 141     }
 142
 143     #[test]
 144     pub fn test_from_str() {
 145         assert_eq!(from_str::<$T>("0"), Some(0 as $T));
 146         assert_eq!(from_str::<$T>("3"), Some(3 as $T));
 147         assert_eq!(from_str::<$T>("10"), Some(10 as $T));
 148         assert_eq!(from_str::<u32>("123456789"), Some(123456789 as u32));
 149         assert_eq!(from_str::<$T>("00100"), Some(100 as $T));
 150
 151         assert_eq!(from_str::<$T>(""), None);
 152         assert_eq!(from_str::<$T>(" "), None);
 153         assert_eq!(from_str::<$T>("x"), None);
 154     }
 155
 156     #[test]
 157     pub fn test_parse_bytes() {
 158         assert_eq!($T::from_str_radix("123", 10), Ok(123 as $T));
 159         assert_eq!($T::from_str_radix("1001", 2), Ok(9 as $T));
 160         assert_eq!($T::from_str_radix("123", 8), Ok(83 as $T));
 161         assert_eq!(u16::from_str_radix("123", 16), Ok(291 as u16));
 162         assert_eq!(u16::from_str_radix("ffff", 16), Ok(65535 as u16));
 163         assert_eq!($T::from_str_radix("z", 36), Ok(35 as $T));
 164
 165         assert_eq!($T::from_str_radix("Z", 10).ok(), None::<$T>);
 166         assert_eq!($T::from_str_radix("_", 2).ok(), None::<$T>);
 167     }
 168 }
 169 )}