devela 0.27.0

A development layer of coherence.
Documentation 
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// devela::data::value::tuple::tests

use super::*;

type TestTuple = (i32, f32, &'static str, bool);

const TUPLE: TestTuple = (10, 20.5, "Hello", true);

#[test]
fn tuple_arity() {
    assert_eq!(TUPLE.arity(), 4);
    assert_eq!(TUPLE.arity(), TestTuple::ARITY);
}

#[test]
fn tuple_head() {
    assert_eq!(TUPLE.head(), &10);
}

#[test]
fn tuple_tail() {
    assert_eq!(TUPLE.tail(), &true);
}

#[test]
fn tuple_head_mut() {
    let mut tuple = TUPLE;
    assert_eq!(tuple.head(), &10);
    *tuple.head_mut() = 15;
    assert_eq!(tuple.head(), &15);
}

#[test]
fn tuple_tail_mut() {
    let mut tuple = TUPLE;
    assert_eq!(tuple.tail(), &true);
    *tuple.tail_mut() = false;
    assert_eq!(tuple.tail(), &false);
}

#[test]
fn tuple_split_head() {
    let (head, no_head) = TUPLE.split_head();
    assert_eq!(head, 10);
    assert_eq!(no_head, (20.5, "Hello", true));
}

#[test]
fn tuple_split_tail() {
    let (no_tail, tail) = TUPLE.split_tail();
    assert_eq!(no_tail, (10, 20.5, "Hello"));
    assert_eq!(tail, true);
}

#[test]
fn tuple_no_head() {
    assert_eq!(TUPLE.no_head(), (20.5, "Hello", true));
}

#[test]
fn tuple_no_tail() {
    assert_eq!(TUPLE.no_tail(), (10, 20.5, "Hello"));
}

#[test]
fn tuple_append() {
    let result = TUPLE.append('@');
    assert_eq!(result, (10, 20.5, "Hello", true, '@'));
}

#[test]
fn tuple_prepend() {
    let result = TUPLE.prepend('@');
    assert_eq!(result, ('@', 10, 20.5, "Hello", true));
}

#[test]
fn tuple_nth() {
    assert![matches![TUPLE.nth(2), Some(TupleElement::_2("Hello"))]];

    // alternative form
    match TUPLE.nth(2) {
        Some(TupleElement::_2(value)) => assert_eq!(value, "Hello"),
        _ => panic!("Unexpected result"),
    }
}
#[test] #[rustfmt::skip]
fn tuple_nth_clone() {
    #[derive(Clone, Debug)]
    struct Clonable;
    let tuple = (10, 20.5, Clonable, true);

    assert![matches![tuple.nth_cloned(2), Some(TupleElement::_2(Clonable))]];
    assert![matches![tuple.nth_cloned(2), Some(TupleElement::_2(Clonable))]];
}
#[test]
fn tuple_nth_ref() {
    assert![matches![TUPLE.nth_ref(2), Some(TupleElementRef::_2(&"Hello"))]];
}
#[test] #[rustfmt::skip]
fn tuple_nth_mut() {
    let mut tuple = TUPLE;
    assert![matches![tuple.nth_mut(2), Some(TupleElementMut::_2(&mut "Hello"))]];
}

#[test] #[rustfmt::skip]
fn tuple_into_iter() {
    let mut ti = TUPLE.into_iter();
    assert_eq![ti.next(), Some(TupleElement::_0(10))];
    assert_eq![ti.next_back(), Some(TupleElement::_3(true))];
    assert_eq![ti.next(), Some(TupleElement::_1(20.5))];
    assert_eq![ti.next_back(), Some(TupleElement::_2("Hello"))];
    assert_eq![ti.next(), None];
    assert_eq![ti.next_back(), None];
}
#[test] #[rustfmt::skip]
fn tuple_iter_ref() {
    let mut ti = TUPLE.iter_ref();
    assert_eq![ti.next(), Some(TupleElementRef::_0(&10))];
    assert_eq![ti.next_back(), Some(TupleElementRef::_3(&true))];
    assert_eq![ti.next(), Some(TupleElementRef::_1(&20.5))];
    assert_eq![ti.next_back(), Some(TupleElementRef::_2(&"Hello"))];
    assert_eq![ti.next(), None];
    assert_eq![ti.next_back(), None];
}
#[test] #[rustfmt::skip]
fn tuple_iter_mut() {
    let mut tuple = TUPLE;
    let mut ti = tuple.iter_mut();
    assert_eq![ti.next(), Some(TupleElementMut::_0(&mut 10))];
    assert_eq![ti.next_back(), Some(TupleElementMut::_3(&mut true))];
    assert_eq![ti.next(), Some(TupleElementMut::_1(&mut 20.5))];
    assert_eq![ti.next_back(), Some(TupleElementMut::_2(&mut "Hello"))];
    assert_eq![ti.next(), None];
    assert_eq![ti.next_back(), None];
}