forked from Peternator7/strum
/
enum_iter.rs
117 lines (99 loc) · 2.18 KB
/
enum_iter.rs
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extern crate strum;
#[macro_use]
extern crate strum_macros;
use strum::IntoEnumIterator;
#[derive(Debug, Eq, PartialEq, EnumIter)]
enum Week {
Sunday,
Monday,
Tuesday,
Wednesday,
Thursday,
Friday,
Saturday,
}
#[test]
fn simple_test() {
let results = Week::iter().collect::<Vec<_>>();
let expected = vec![
Week::Sunday,
Week::Monday,
Week::Tuesday,
Week::Wednesday,
Week::Thursday,
Week::Friday,
Week::Saturday,
];
assert_eq!(expected, results);
}
#[derive(Debug, Eq, PartialEq, EnumIter)]
enum Complicated<U: Default, V: Default> {
A(U),
B { v: V },
C,
}
#[test]
fn complicated_test() {
let results = Complicated::iter().collect::<Vec<_>>();
let expected = vec![
Complicated::A(0),
Complicated::B { v: String::new() },
Complicated::C,
];
assert_eq!(expected, results);
}
#[test]
fn len_test() {
let mut i = Complicated::<(), ()>::iter();
assert_eq!(3, i.len());
i.next();
assert_eq!(2, i.len());
i.next();
assert_eq!(1, i.len());
i.next();
assert_eq!(0, i.len());
}
#[test]
fn clone_test() {
let mut i = Week::iter();
i.next();
i.next();
let mut i_cloned = i.clone();
assert_eq!(Some(Week::Tuesday), i.next());
assert_eq!(Some(Week::Tuesday), i_cloned.next());
i.next();
i.next();
assert_eq!(Some(Week::Friday), i.next());
assert_eq!(Some(Week::Wednesday), i_cloned.next());
}
#[test]
fn cycle_test() {
let results = Week::iter().cycle().take(10).collect::<Vec<_>>();
let expected = vec![
Week::Sunday,
Week::Monday,
Week::Tuesday,
Week::Wednesday,
Week::Thursday,
Week::Friday,
Week::Saturday,
Week::Sunday,
Week::Monday,
Week::Tuesday,
];
assert_eq!(expected, results);
}
#[test]
fn reverse_test() {
let results = Week::iter().rev().collect::<Vec<_>>();
let expected = vec![
Week::Saturday,
Week::Friday,
Week::Thursday,
Week::Wednesday,
Week::Tuesday,
Week::Monday,
Week::Sunday,
];
assert_eq!(expected, results);
}