dioxus-mirror/packages/dioxus/tests/miri_stress.rs

#![allow(non_snake_case)]
/*
Stress Miri as much as possible.

Prove that we don't leak memory and that our methods are safe.

Specifically:
- [ ] VirtualDom drops memory safely
- [ ] Borrowed components don't expose invalid pointers
- [ ] Async isn't busted
*/

use dioxus::prelude::*;
use dioxus_core::SchedulerMsg;

fn new_dom<P: 'static + Send>(app: Component<P>, props: P) -> VirtualDom {
    VirtualDom::new_with_props(app, props)
}

/// This test ensures that if a component aborts early, it is replaced with a placeholder.
/// In debug, this should also toss a warning.
#[test]
fn test_memory_leak() {
    fn app(cx: Scope) -> Element {
        let val = cx.use_hook(|| 0);

        *val += 1;

        if *val == 2 || *val == 4 {
            return None;
        }

        let name = cx.use_hook(|| String::from("asd"));

        cx.render(rsx!(
            div { "Hello, world!" }
            Child {}
            Child {}
            Child {}
            Child {}
            Child {}
            Child {}
            BorrowedChild { na: name }
            BorrowedChild { na: name }
            BorrowedChild { na: name }
            BorrowedChild { na: name }
            BorrowedChild { na: name }
        ))
    }

    #[derive(Props)]
    struct BorrowedProps<'a> {
        na: &'a str,
    }

    fn BorrowedChild<'a>(cx: Scope<'a, BorrowedProps<'a>>) -> Element {
        render!(div {
            "goodbye {cx.props.na}"
            Child {}
            Child {}
        })
    }

    fn Child(cx: Scope) -> Element {
        render!(div { "goodbye world" })
    }

    let mut dom = new_dom(app, ());

    dom.rebuild();
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
}

#[test]
fn memo_works_properly() {
    fn app(cx: Scope) -> Element {
        let val = cx.use_hook(|| 0);

        *val += 1;

        if *val == 2 || *val == 4 {
            return None;
        }

        let name = cx.use_hook(|| String::from("asd"));

        cx.render(rsx!(
            div { "Hello, world! {name}" }
            Child { na: "asdfg".to_string() }
        ))
    }

    #[derive(PartialEq, Props)]
    struct ChildProps {
        na: String,
    }

    fn Child(cx: Scope<ChildProps>) -> Element {
        render!(div { "goodbye world" })
    }

    let mut dom = new_dom(app, ());

    dom.rebuild();
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
    dom.hard_diff(ScopeId(0));
}

#[test]
fn free_works_on_root_props() {
    fn app(cx: Scope<Custom>) -> Element {
        cx.render(rsx! {
            Child { a: "alpha"}
            Child { a: "beta"}
            Child { a: "gamma"}
            Child { a: "delta"}
        })
    }

    #[derive(Props, PartialEq)]
    struct ChildProps {
        a: &'static str,
    }

    fn Child(cx: Scope<ChildProps>) -> Element {
        render!("child {cx.props.a}")
    }

    struct Custom {
        val: String,
    }

    impl Drop for Custom {
        fn drop(&mut self) {
            dbg!("dropped! {}", &self.val);
        }
    }

    let mut dom = new_dom(app, Custom { val: String::from("asd") });
    dom.rebuild();
}

#[test]
fn free_works_on_borrowed() {
    fn app(cx: Scope) -> Element {
        cx.render(rsx! {
            Child { a: "alpha", b: "asd".to_string() }
        })
    }
    #[derive(Props)]
    struct ChildProps<'a> {
        a: &'a str,
        b: String,
    }

    fn Child<'a>(cx: Scope<'a, ChildProps<'a>>) -> Element {
        dbg!("rendering child");
        render!("child {cx.props.a}, {cx.props.b}")
    }

    impl Drop for ChildProps<'_> {
        fn drop(&mut self) {
            dbg!("dropped child!");
        }
    }

    let mut dom = new_dom(app, ());
    let _ = dom.rebuild();
}

#[test]
fn free_works_on_root_hooks() {
    /*
    On Drop, scopearena drops all the hook contents.
    */

    struct Droppable<T>(T);
    impl<T> Drop for Droppable<T> {
        fn drop(&mut self) {
            dbg!("dropping droppable");
        }
    }

    fn app(cx: Scope) -> Element {
        let name = cx.use_hook(|| Droppable(String::from("asd")));
        render!(div { "{name.0}" })
    }

    let mut dom = new_dom(app, ());
    let _ = dom.rebuild();
}

#[test]
fn old_props_arent_stale() {
    fn app(cx: Scope) -> Element {
        dbg!("rendering parent");
        let cnt = cx.use_hook(|| 0);
        *cnt += 1;

        if *cnt == 1 {
            render!(div { Child { a: "abcdef".to_string() } })
        } else {
            render!(div { Child { a: "abcdef".to_string() } })
        }
    }

    #[derive(Props, PartialEq)]
    struct ChildProps {
        a: String,
    }
    fn Child(cx: Scope<ChildProps>) -> Element {
        dbg!("rendering child", &cx.props.a);
        render!(div { "child {cx.props.a}" })
    }

    let mut dom = new_dom(app, ());
    let _ = dom.rebuild();

    dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
    dom.work_with_deadline(|| false);

    dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
    dom.work_with_deadline(|| false);

    dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
    dom.work_with_deadline(|| false);

    dbg!("forcing update to child");

    dom.handle_message(SchedulerMsg::Immediate(ScopeId(1)));
    dom.work_with_deadline(|| false);

    dom.handle_message(SchedulerMsg::Immediate(ScopeId(1)));
    dom.work_with_deadline(|| false);

    dom.handle_message(SchedulerMsg::Immediate(ScopeId(1)));
    dom.work_with_deadline(|| false);
}

#[test]
fn basic() {
    fn app(cx: Scope) -> Element {
        render!(div {
            Child { a: "abcdef".to_string() }
        })
    }

    #[derive(Props, PartialEq)]
    struct ChildProps {
        a: String,
    }

    fn Child(cx: Scope<ChildProps>) -> Element {
        dbg!("rendering child", &cx.props.a);
        render!(div { "child {cx.props.a}" })
    }

    let mut dom = new_dom(app, ());
    let _ = dom.rebuild();

    dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
    dom.work_with_deadline(|| false);

    dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
    dom.work_with_deadline(|| false);
}

#[test]
fn leak_thru_children() {
    fn app(cx: Scope) -> Element {
        cx.render(rsx! {
            Child {
                name: "asd".to_string(),
            }
        });
        cx.render(rsx! {
            div {}
        })
    }

    #[inline_props]
    fn Child(cx: Scope, name: String) -> Element {
        render!(div { "child {name}" })
    }

    let mut dom = new_dom(app, ());
    let _ = dom.rebuild();

    dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
    dom.work_with_deadline(|| false);

    dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
    dom.work_with_deadline(|| false);
}

#[test]
fn test_pass_thru() {
    #[inline_props]
    fn NavContainer<'a>(cx: Scope, children: Element<'a>) -> Element {
        cx.render(rsx! {
            header {
                nav { children }
            }
        })
    }

    fn NavMenu(cx: Scope) -> Element {
        render!(            NavBrand {}
            div {
                NavStart {}
                NavEnd {}
            }
        )
    }

    fn NavBrand(cx: Scope) -> Element {
        render!(div {})
    }

    fn NavStart(cx: Scope) -> Element {
        render!(div {})
    }

    fn NavEnd(cx: Scope) -> Element {
        render!(div {})
    }

    #[inline_props]
    fn MainContainer<'a>(
        cx: Scope,
        nav: Element<'a>,
        body: Element<'a>,
        footer: Element<'a>,
    ) -> Element {
        cx.render(rsx! {
            div {
                class: "columns is-mobile",
                div {
                    class: "column is-full",
                    nav,
                    body,
                    footer,
                }
            }
        })
    }

    fn app(cx: Scope) -> Element {
        let nav = cx.render(rsx! {
            NavContainer {
                NavMenu {}
            }
        });
        let body = cx.render(rsx! {
            div {}
        });
        let footer = cx.render(rsx! {
            div {}
        });

        cx.render(rsx! {
            MainContainer {
                nav: nav,
                body: body,
                footer: footer,
            }
        })
    }

    let mut dom = new_dom(app, ());
    let _ = dom.rebuild();

    for _ in 0..40 {
        dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
        dom.work_with_deadline(|| false);
        dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
        dom.work_with_deadline(|| false);
        dom.handle_message(SchedulerMsg::Immediate(ScopeId(0)));
        dom.work_with_deadline(|| false);

        dom.handle_message(SchedulerMsg::Immediate(ScopeId(1)));
        dom.work_with_deadline(|| false);
        dom.handle_message(SchedulerMsg::Immediate(ScopeId(1)));
        dom.work_with_deadline(|| false);
        dom.handle_message(SchedulerMsg::Immediate(ScopeId(1)));
        dom.work_with_deadline(|| false);

        dom.handle_message(SchedulerMsg::Immediate(ScopeId(2)));
        dom.work_with_deadline(|| false);
        dom.handle_message(SchedulerMsg::Immediate(ScopeId(2)));
        dom.work_with_deadline(|| false);
        dom.handle_message(SchedulerMsg::Immediate(ScopeId(2)));
        dom.work_with_deadline(|| false);

        dom.handle_message(SchedulerMsg::Immediate(ScopeId(3)));
        dom.work_with_deadline(|| false);
        dom.handle_message(SchedulerMsg::Immediate(ScopeId(3)));
        dom.work_with_deadline(|| false);
        dom.handle_message(SchedulerMsg::Immediate(ScopeId(3)));
        dom.work_with_deadline(|| false);
    }
}