1 // Copyright 2013 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 #[cfg(feature = "use_core")]
12 extern crate core;
13
14 #[macro_use]
15 extern crate derivative;
16
17 use std::collections::BTreeMap;
18 use std::iter::Iterator;
19
20 #[derive(Derivative)]
21 #[derive(Ord, PartialOrd)]
22 #[derivative(Eq, Hash, Debug, PartialEq)]
23 // TODO: Ord, PartialOrd
24 struct Zst;
25
26 #[test]
main()27 fn main() {
28 const N: usize = 8;
29
30 for len in 0..N {
31 let mut tester = BTreeMap::new();
32 assert_eq!(tester.len(), 0);
33 for _ in 0..len {
34 tester.insert(Zst, ());
35 }
36 assert_eq!(tester.len(), if len == 0 { 0 } else { 1 });
37 assert_eq!(tester.iter().count(), if len == 0 { 0 } else { 1 });
38 assert_eq!(tester.get(&Zst).is_some(), len > 0);
39 tester.clear();
40 }
41 }
42