erratic 0.10.1

Handling errors in an efficient way.
Documentation 
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mod common;

use common::{TestError, TestMessage, TestState};
use erratic::*;

#[test]
fn builder_with_state_inlines_when_no_source() {
    let err: Error<TestState> = Error::with_state(TestState::FileNotFound).build();
    assert!(matches!(err.state(), Some(TestState::FileNotFound)));
}

#[test]
fn builder_with_state_and_payload_boxes() {
    let err: Error<TestState> = Error::with_state(TestState::FileNotFound)
        .with_payload(TestMessage("data".into()))
        .build();
    assert!(matches!(err.state(), Some(TestState::FileNotFound)));
    let (_, _, payload, _) = err.into_parts::<TestMessage, TestError>();
    assert!(payload.is_some());
    assert_eq!(payload.unwrap().0, "data");
}

#[test]
fn reconstruct_error_from_vacant() {
    let err: Error<TestState> = mkerr!(
        state = TestState::FileNotFound,
        payload = TestMessage("data".into()),
    );

    let (state, vacant) = err.extract_state().unwrap();
    assert_eq!(state, TestState::FileNotFound);

    let err = vacant.with_state(TestState::Other);
    assert!(matches!(err.state(), Some(TestState::Other)));

    let (state, _, payload, _) = err.into_parts::<TestMessage, TestError>();
    assert_eq!(state, Some(TestState::Other));
    assert!(payload.is_some());
    assert_eq!(payload.unwrap().0, "data");
}

#[test]
fn reconstruct_with_error_source_from_vacant() {
    let err: Error<TestState> = mkerr!(
        state = TestState::FileNotFound,
        payload = TestMessage("data".into()),
        error = TestError("oops"),
    );

    let (state, vacant) = err.extract_state().unwrap();
    assert_eq!(state, TestState::FileNotFound);

    let err = vacant.with_state(TestState::Other);
    assert!(matches!(err.state(), Some(TestState::Other)));

    let (state, _, payload, source) = err.into_parts::<TestMessage, TestError>();
    assert_eq!(state, Some(TestState::Other));
    assert!(payload.is_some());
    assert_eq!(payload.unwrap().0, "data");
    assert!(source.is_some());
    assert_eq!(source.unwrap().0, "oops");
}

#[test]
fn extract_state_from_inline_and_reconstruct() {
    let err: Error<TestState> = mkerr!(state = TestState::FileNotFound);

    let (state, vacant) = err.extract_state().unwrap();
    assert_eq!(state, TestState::FileNotFound);

    let err = vacant.with_state(TestState::Other);
    assert!(matches!(err.state(), Some(TestState::Other)));
    assert_eq!(err.into_state(), Some(TestState::Other));
}

#[test]
fn vacant_try_into_stateless() {
    let err: Error<TestState> = mkerr!(
        state = TestState::FileNotFound,
        payload = TestMessage("data".into()),
    );

    let (_state, vacant) = err.extract_state().unwrap();
    let stateless = vacant.try_into_stateless().unwrap();

    let (_, payload, _) = stateless.into_parts::<TestMessage, TestError>();
    assert!(payload.is_some());
    assert_eq!(payload.unwrap().0, "data");
}

#[test]
fn vacant_try_into_stateless_from_inline_returns_none() {
    let err: Error<TestState> = mkerr!(state = TestState::FileNotFound);

    let (_state, vacant) = err.extract_state().unwrap();
    let stateless = vacant.try_into_stateless();
    assert!(stateless.is_none());
}