enum-as-inner 0.3.4

A proc-macro for deriving inner field accessor functions on enums.
Documentation 
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use enum_as_inner::EnumAsInner;

#[derive(EnumAsInner)]
enum UnitVariants {
    Zero,
    One,
    Two,
}

#[test]
fn test_zero_unit() {
    let mut unit = UnitVariants::Zero;

    assert!(unit.as_zero().is_some());
    assert!(unit.as_one().is_none());
    assert!(unit.as_two().is_none());

    assert!(unit.as_zero_mut().is_some());
    assert!(unit.as_one_mut().is_none());
    assert!(unit.as_two_mut().is_none());

    unit.as_zero().expect("expected ");
}

#[test]
fn test_one_unit() {
    let mut unit = UnitVariants::One;

    assert!(unit.as_zero().is_none());
    assert!(unit.as_one().is_some());
    assert!(unit.as_two().is_none());

    assert!(unit.as_zero_mut().is_none());
    assert!(unit.as_one_mut().is_some());
    assert!(unit.as_two_mut().is_none());

    unit.as_one().expect("should have been some unit");
}

#[test]
fn test_two_unit() {
    let mut unit = UnitVariants::Two;

    assert!(unit.as_zero().is_none());
    assert!(unit.as_one().is_none());
    assert!(unit.as_two().is_some());

    assert!(unit.as_zero_mut().is_none());
    assert!(unit.as_one_mut().is_none());
    assert!(unit.as_two_mut().is_some());

    unit.as_two().expect("should have been some unit");
}