1 // Copyright 2013-2015 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 extern crate num as num_renamed;
12 #[macro_use]
13 extern crate num_derive;
14
15 #[derive(Debug, PartialEq, FromPrimitive, ToPrimitive)]
16 enum Color {
17 Red,
18 Blue,
19 Green,
20 }
21
22 #[test]
test_from_primitive_for_trivial_case()23 fn test_from_primitive_for_trivial_case() {
24 let v: [Option<Color>; 4] = [
25 num_renamed::FromPrimitive::from_u64(0),
26 num_renamed::FromPrimitive::from_u64(1),
27 num_renamed::FromPrimitive::from_u64(2),
28 num_renamed::FromPrimitive::from_u64(3),
29 ];
30
31 assert_eq!(
32 v,
33 [
34 Some(Color::Red),
35 Some(Color::Blue),
36 Some(Color::Green),
37 None
38 ]
39 );
40 }
41
42 #[test]
test_to_primitive_for_trivial_case()43 fn test_to_primitive_for_trivial_case() {
44 let v: [Option<u64>; 3] = [
45 num_renamed::ToPrimitive::to_u64(&Color::Red),
46 num_renamed::ToPrimitive::to_u64(&Color::Blue),
47 num_renamed::ToPrimitive::to_u64(&Color::Green),
48 ];
49
50 assert_eq!(v, [Some(0), Some(1), Some(2)]);
51 }
52
53 #[test]
test_reflexive_for_trivial_case()54 fn test_reflexive_for_trivial_case() {
55 let before: [u64; 3] = [0, 1, 2];
56 let after: Vec<Option<u64>> = before
57 .iter()
58 .map(|&x| -> Option<Color> { num_renamed::FromPrimitive::from_u64(x) })
59 .map(|x| x.and_then(|x| num_renamed::ToPrimitive::to_u64(&x)))
60 .collect();
61 let before = before.iter().cloned().map(Some).collect::<Vec<_>>();
62
63 assert_eq!(before, after);
64 }
65