forked from Peternator7/strum
/
enum_discriminants.rs
120 lines (100 loc) · 2.89 KB
/
enum_discriminants.rs
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extern crate strum;
#[macro_use]
extern crate strum_macros;
use strum::IntoEnumIterator;
#[allow(dead_code)]
#[derive(Debug, Eq, PartialEq, EnumDiscriminants)]
#[strum_discriminants(derive(EnumIter))]
enum Simple {
Variant0,
Variant1,
}
#[test]
fn simple_test() {
let discriminants = SimpleDiscriminants::iter().collect::<Vec<_>>();
let expected = vec![SimpleDiscriminants::Variant0, SimpleDiscriminants::Variant1];
assert_eq!(expected, discriminants);
}
#[derive(Debug)]
struct NonDefault;
#[allow(dead_code)]
#[derive(Debug, EnumDiscriminants)]
#[strum_discriminants(derive(EnumIter))]
enum WithFields {
Variant0(NonDefault),
Variant1 { a: NonDefault },
}
#[test]
fn fields_test() {
let discriminants = WithFieldsDiscriminants::iter().collect::<Vec<_>>();
let expected = vec![
WithFieldsDiscriminants::Variant0,
WithFieldsDiscriminants::Variant1,
];
assert_eq!(expected, discriminants);
}
trait Foo {}
trait Bar {}
#[allow(dead_code)]
#[derive(Debug, Eq, PartialEq, EnumDiscriminants)]
#[strum_discriminants(derive(EnumIter))]
enum Complicated<U: Foo, V: Bar> {
/// With Docs
A(U),
B {
v: V,
},
C,
}
#[test]
fn complicated_test() {
let discriminants = ComplicatedDiscriminants::iter().collect::<Vec<_>>();
let expected = vec![
ComplicatedDiscriminants::A,
ComplicatedDiscriminants::B,
ComplicatedDiscriminants::C,
];
assert_eq!(expected, discriminants);
}
// This test exists to ensure that we do not copy across the `#[strum(default = "true")]` meta
// attribute. If we do without deriving any `strum` derivations on the generated discriminant enum,
// Rust will generate a compiler error saying it doesn't understand the `strum` attribute.
#[allow(dead_code)]
#[derive(Debug, EnumDiscriminants)]
enum WithDefault {
#[strum(default = "true")]
A(String),
B,
}
#[test]
fn with_default_test() {
assert!(WithDefaultDiscriminants::A != WithDefaultDiscriminants::B);
}
#[allow(dead_code)]
#[derive(Debug, Eq, PartialEq, EnumDiscriminants)]
#[strum_discriminants(name(EnumBoo), derive(EnumIter))]
enum Renamed {
Variant0(bool),
Variant1(i32),
}
#[test]
fn renamed_test() {
let discriminants = EnumBoo::iter().collect::<Vec<_>>();
let expected = vec![EnumBoo::Variant0, EnumBoo::Variant1];
assert_eq!(expected, discriminants);
}
#[allow(dead_code)]
#[derive(Debug, Eq, PartialEq, EnumDiscriminants)]
#[strum_discriminants(name(SplitAttributesBoo), derive(Display))]
#[strum_discriminants(derive(EnumIter))]
enum SplitAttributes {
Variant0(bool),
Variant1(i32),
}
#[test]
fn split_attributes_test() {
let discriminants = SplitAttributesBoo::iter().collect::<Vec<_>>();
let expected = vec![SplitAttributesBoo::Variant0, SplitAttributesBoo::Variant1];
assert_eq!(expected, discriminants);
assert_eq!("Variant0", format!("{}", SplitAttributesBoo::Variant0));
}