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time_test.rs
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time_test.rs
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#[cfg(feature = "chrono")]
mod shared {
use chrono::{DateTime, Utc};
use crux_core::macros::Effect;
use crux_core::render::Render;
use crux_time::{Time, TimeResponse};
use serde::{Deserialize, Serialize};
#[derive(Default)]
pub struct App;
#[derive(Serialize, Deserialize)]
pub enum Event {
Get,
GetAsync,
Set(TimeResponse),
StartDebounce,
DurationElapsed(usize, TimeResponse),
}
#[derive(Default)]
struct Debounce {
pending: usize,
}
impl Debounce {
fn start(&mut self) -> usize {
self.pending = self.pending.wrapping_add(1);
self.pending
}
fn resolve(&mut self, pending: usize) -> bool {
self.pending == pending
}
}
#[derive(Default)]
pub struct Model {
pub time: String,
debounce: Debounce,
pub debounce_complete: bool,
}
#[derive(Serialize, Deserialize, Default)]
pub struct ViewModel {
pub time: String,
}
impl crux_core::App for App {
type Event = Event;
type Model = Model;
type ViewModel = ViewModel;
type Capabilities = Capabilities;
fn update(&self, event: Event, model: &mut Model, caps: &Capabilities) {
match event {
Event::Get => caps.time.now(Event::Set),
Event::GetAsync => caps.compose.spawn(|ctx| {
let time = caps.time.clone();
async move {
ctx.update_app(Event::Set(time.now_async().await));
}
}),
Event::Set(time) => {
if let TimeResponse::Now(time) = time {
let time: DateTime<Utc> = time.try_into().unwrap();
model.time = time.to_rfc3339();
caps.render.render()
}
}
Event::StartDebounce => {
let pending = model.debounce.start();
caps.time.notify_after(
crux_time::Duration::from_millis(300).expect("valid duration"),
event_with_user_info(pending, Event::DurationElapsed),
);
}
Event::DurationElapsed(pending, TimeResponse::DurationElapsed) => {
if model.debounce.resolve(pending) {
model.debounce_complete = true;
}
}
Event::DurationElapsed(_, _) => {
panic!("Unexpected debounce event")
}
}
}
fn view(&self, model: &Self::Model) -> Self::ViewModel {
ViewModel {
time: model.time.clone(),
}
}
}
#[derive(Effect)]
pub struct Capabilities {
pub time: Time<Event>,
pub render: Render<Event>,
#[effect(skip)]
pub compose: crux_core::compose::Compose<Event>,
}
/// Helper to create an event with additional user info captured
/// this is effectively partially applying the event constructor
pub fn event_with_user_info<E, F, U, T>(user_info: U, make_event: F) -> impl FnOnce(T) -> E
where
F: FnOnce(U, T) -> E,
{
move |response| make_event(user_info, response)
}
}
#[cfg(feature = "chrono")]
mod shell {
use super::shared::{App, Effect, Event};
use chrono::{DateTime, Utc};
use crux_core::{Core, Request};
use crux_time::{Instant, TimeRequest, TimeResponse};
use std::collections::VecDeque;
pub enum Outcome {
Time(Request<TimeRequest>, Instant),
}
enum CoreMessage {
Event(Event),
Response(Outcome),
}
pub fn run(core: &Core<Effect, App>) {
let mut queue: VecDeque<CoreMessage> = VecDeque::new();
queue.push_back(CoreMessage::Event(Event::Get));
while !queue.is_empty() {
let msg = queue.pop_front();
let effs = match msg {
Some(CoreMessage::Event(m)) => core.process_event(m),
Some(CoreMessage::Response(Outcome::Time(mut request, result))) => {
core.resolve(&mut request, TimeResponse::Now(result))
}
_ => vec![],
};
for effect in effs {
if let Effect::Time(request) = effect {
let time: DateTime<Utc> =
"2022-12-01T01:47:12.746202562+00:00".parse().unwrap();
queue.push_back(CoreMessage::Response(Outcome::Time(
request,
time.try_into().unwrap(),
)));
}
}
}
}
}
#[cfg(feature = "chrono")]
mod tests {
use crate::{
shared::{App, Effect, Event, Model},
shell::run,
};
use chrono::{DateTime, Utc};
use crux_core::{testing::AppTester, Core};
use crux_time::TimeResponse;
#[test]
pub fn test_time() {
let core: Core<Effect, App> = Core::default();
run(&core);
assert_eq!(core.view().time, "2022-12-01T01:47:12.746202562+00:00");
}
#[test]
pub fn test_time_async() {
let app = AppTester::<App, _>::default();
let mut model = Model::default();
let update = app.update(Event::GetAsync, &mut model);
let effect = update.into_effects().next().unwrap();
let Effect::Time(mut request) = effect else {
panic!("Expected Time effect");
};
let now: DateTime<Utc> = "2022-12-01T01:47:12.746202562+00:00".parse().unwrap();
let response = TimeResponse::Now(now.try_into().unwrap());
let update = app.resolve(&mut request, response).unwrap();
let event = update.events.into_iter().next().unwrap();
app.update(event, &mut model);
assert_eq!(app.view(&model).time, "2022-12-01T01:47:12.746202562+00:00");
}
#[test]
pub fn test_debounce_timer() {
let app = AppTester::<App, _>::default();
let mut model = Model::default();
let update1 = app.update(Event::StartDebounce, &mut model);
let update2 = app.update(Event::StartDebounce, &mut model);
let Effect::Time(mut request1) = update1.into_effects().next().unwrap() else {
panic!("Expected Time effect");
};
// resolve and run loop
app.update(
app.resolve(&mut request1, TimeResponse::DurationElapsed)
.unwrap()
.events
.into_iter()
.next()
.unwrap(),
&mut model,
);
// resolving the first debounce should not set the debounce_complete flag
assert!(!model.debounce_complete);
let Effect::Time(mut request2) = update2.into_effects().next().unwrap() else {
panic!("Expected Time effect");
};
// resolve and run loop
app.update(
app.resolve(&mut request2, TimeResponse::DurationElapsed)
.unwrap()
.events
.into_iter()
.next()
.unwrap(),
&mut model,
);
// resolving the second debounce should set the debounce_complete flag
assert!(model.debounce_complete);
}
}