Minor fixes for tests (#4686)

* Suggested method for correcting integration tests

* Use static atomics for simplicity

This is consistent with the test immediately below.

* Add assertions to some tests, comments to others

This should fix a handful of tests that didn't correctly do their test.

In other places, comments should make it clearer *why* tests are how
they are.

* Be consistent with existing imports

* remove bad test

* nit

* fix compile errrs

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/core/tests/bubble_error.rs

@@ -1,29 +0,0 @@
-//! we should properly bubble up errors from components
-
-use dioxus::prelude::*;
-use dioxus_core::generation;
-
-fn app() -> Element {
-    let raw = match generation() % 2 {
-        0 => "123.123",
-        1 => "123.123.123",
-        _ => unreachable!(),
-    };
-
-    let value = raw.parse::<f32>().unwrap_or(123.123);
-
-    rsx! { div { "hello {value}" } }
-}
-
-#[test]
-fn bubbles_error() {
-    let mut dom = VirtualDom::new(app);
-
-    {
-        let _edits = dom.rebuild_to_vec();
-    }
-
-    dom.mark_dirty(ScopeId::APP);
-
-    _ = dom.render_immediate_to_vec();
-}

packages/core/tests/conditional_formatted_attributes.rs

@@ -1,7 +1,8 @@
 use dioxus::prelude::*;
 
 /// Make sure that rsx! handles conditional attributes with one formatted branch correctly
-/// Regression test for https://github.com/DioxusLabs/dioxus/issues/2997
+/// Regression test for https://github.com/DioxusLabs/dioxus/issues/2997. There are no assertions in
+/// this test as it primarily checks that the RSX can be compiled correctly.
 #[test]
 fn partially_formatted_conditional_attribute() {
     let width = "1px";

packages/core/tests/diff_keyed_list.rs

@@ -2,7 +2,7 @@
 //!
 //! These tests only verify that the diffing algorithm works properly for single components.
 //!
-//! It does not validated that component lifecycles work properly. This is done in another test file.
+//! It does not validate that component lifecycles work properly. This is done in another test file.
 
 use dioxus::dioxus_core::{ElementId, Mutation::*};
 use dioxus::prelude::*;

packages/core/tests/diff_unkeyed_list.rs

@@ -464,7 +464,7 @@ fn replace_and_add_items() {
         );
     }
 
-    // Rerendering adds an a static template
+    // Rerendering adds a static template
     {
         dom.mark_dirty(ScopeId::APP);
         let edits = dom.render_immediate_to_vec();

packages/core/tests/error_boundary.rs

@@ -44,7 +44,7 @@ fn clear_error_boundary() {
 
     #[component]
     pub fn ThrowsError() -> Element {
-        if THREW_ERROR.load(std::sync::atomic::Ordering::SeqCst) {
+        if !THREW_ERROR.load(std::sync::atomic::Ordering::SeqCst) {
             THREW_ERROR.store(true, std::sync::atomic::Ordering::SeqCst);
             Err(CapturedError::from_display("This is an error").into())
         } else {
@@ -71,7 +71,22 @@ fn clear_error_boundary() {
 
     let mut dom = VirtualDom::new(App);
     dom.rebuild(&mut dioxus_core::NoOpMutations);
-    let out = dioxus_ssr::render(&dom);
+    // The DOM will now contain no text - the error was thrown by ThrowsError and caught by the
+    // ErrorBoundary. This calls `needs_update()`, but the update hasn't been processed yet.
 
+    dom.render_immediate(&mut dioxus_core::NoOpMutations);
+    // The ErrorBoundary has now called its `handle_error` handler. The DOM contains the string
+    // "We cleared it", and `needs_update()` has been called again (by `error.clear_errors()`)
+
+    dom.render_immediate(&mut dioxus_core::NoOpMutations);
+    // `ThrowsError` is re-rendered, but this time does not throw an error, so at the end the DOM
+    // contains "We should see this"
+
+    let out = dioxus_ssr::render(&dom);
     assert_eq!(out, "We should see this");
+
+    // There should be no errors left in the error boundary
+    dom.in_scope(ScopeId::APP, || {
+        assert!(consume_context::<ErrorContext>().error().is_none())
+    })
 }

packages/core/tests/fuzzing.rs

@@ -287,6 +287,10 @@ fn create() {
         let mut vdom =
             VirtualDom::new_with_props(create_random_element, DepthProps { depth: 0, root: true });
         vdom.rebuild(&mut NoOpMutations);
+
+        vdom.in_scope(ScopeId::APP, || {
+            assert!(consume_context::<ErrorContext>().error().is_none())
+        })
     }
 }
 
@@ -317,6 +321,10 @@ fn diff() {
                 ));
             }
         }
+
+        vdom.in_scope(ScopeId::APP, || {
+            assert!(consume_context::<ErrorContext>().error().is_none())
+        })
     }
 }
 

packages/core/tests/miri_full_app.rs

@@ -3,6 +3,8 @@ use dioxus_core::ElementId;
 use dioxus_elements::SerializedHtmlEventConverter;
 use std::{any::Any, rc::Rc};
 
+// This test is intended to be run with Miri, and contains no assertions. If it completes under
+// Miri, it has passed.
 #[test]
 fn miri_rollover() {
     set_event_converter(Box::new(SerializedHtmlEventConverter));

packages/core/tests/miri_simple.rs

@@ -1,6 +1,9 @@
 use dioxus::prelude::*;
 use dioxus_core::generation;
 
+// The tests in this file are intended to be run with Miri, and contain no assertions. If they
+// complete under Miri, they have passed.
+
 #[test]
 fn app_drops() {
     fn app() -> Element {

packages/core/tests/miri_stress.rs

@@ -5,6 +5,9 @@ use std::rc::Rc;
 use dioxus::prelude::*;
 use dioxus_core::{generation, NoOpMutations};
 
+// The tests in this file are intended to be run with Miri, so not all of them contain assertions.
+// If the tests  complete under Miri, they have passed.
+
 /// This test checks that we should release all memory used by the virtualdom when it exits.
 ///
 /// When miri runs, it'll let us know if we leaked or aliased.

packages/core/tests/suspense.rs

@@ -217,22 +217,6 @@ fn suspended_nodes_dont_trigger_effects() {
         }
     }
 
-    #[component]
-    fn RerendersFrequently() -> Element {
-        let mut count = use_signal(|| 0);
-
-        use_future(move || async move {
-            for _ in 0..100 {
-                tokio::time::sleep(std::time::Duration::from_millis(10)).await;
-                count.set(count() + 1);
-            }
-        });
-
-        rsx! {
-            div { "rerenders frequently" }
-        }
-    }
-
     #[component]
     fn Child() -> Element {
         let mut future_resolved = use_signal(|| false);
@@ -474,22 +458,6 @@ fn toggle_suspense() {
 fn nested_suspense_resolves_client() {
     use Mutation::*;
 
-    async fn poll_three_times() {
-        // Poll each task 3 times
-        let mut count = 0;
-        poll_fn(|cx| {
-            println!("polling... {}", count);
-            if count < 3 {
-                count += 1;
-                cx.waker().wake_by_ref();
-                Poll::Pending
-            } else {
-                Poll::Ready(())
-            }
-        })
-        .await;
-    }
-
     fn app() -> Element {
         rsx! {
             SuspenseBoundary {

packages/signals/tests/create.rs

@@ -1,7 +1,7 @@
 #![allow(unused, non_upper_case_globals, non_snake_case)]
 
 use dioxus::prelude::*;
-use dioxus_core::{generation, ElementId, NoOpMutations};
+use dioxus_core::{generation, ElementId, Mutation, NoOpMutations};
 use dioxus_signals::*;
 
 #[test]
@@ -22,35 +22,57 @@ fn create_signals_global() {
         }
     }
 
-    dom.rebuild_in_place();
-
     fn create_without_cx() -> Signal<String> {
         Signal::new("hello world".to_string())
     }
+
+    let muts = dom.rebuild_to_vec();
+
+    // 11 edits: 10x CreateTextNode and 1x AppendChildren. These assertions rely on the VirtualDOM's
+    // logic, but doing this means not introducing a dependency on a renderer.
+    assert_eq!(11, muts.edits.len());
+    for i in 0..10 {
+        assert_eq!(
+            &muts.edits[i],
+            &Mutation::CreateTextNode {
+                value: ("hello world".to_string()),
+                id: ElementId(i + 1)
+            }
+        );
+    }
+    assert_eq!(
+        &muts.edits[10],
+        &Mutation::AppendChildren {
+            id: ElementId(0),
+            m: 10
+        }
+    )
 }
 
 #[test]
 fn deref_signal() {
+    use std::sync::atomic::{AtomicBool, Ordering};
+    static STRINGS_MATCH: AtomicBool = AtomicBool::new(false);
+
     let mut dom = VirtualDom::new(|| {
-        rsx! {
-            for _ in 0..10 {
-                Child {}
-            }
-        }
+        rsx! { Child {} }
     });
 
     fn Child() -> Element {
         let signal = Signal::new("hello world".to_string());
 
         // You can call signals like functions to get a Ref of their value.
-        assert_eq!(&*signal(), "hello world");
+        let result = &*signal();
+        STRINGS_MATCH.store(result.eq("hello world"), Ordering::Relaxed);
 
         rsx! {
-            "hello world"
+            "arbitrary text"
         }
     }
 
     dom.rebuild_in_place();
+
+    assert!(STRINGS_MATCH.load(Ordering::Relaxed));
 }
 
 #[test]

packages/signals/tests/memo.rs

@@ -1,8 +1,8 @@
 #![allow(unused, non_upper_case_globals, non_snake_case)]
 use dioxus::html::p;
 use dioxus::prelude::*;
-use dioxus_core::NoOpMutations;
 use dioxus_core::{generation, ElementId};
+use dioxus_core::{NoOpMutations, ScopeState};
 use dioxus_signals::*;
 use std::cell::RefCell;
 use std::collections::HashMap;
@@ -141,6 +141,10 @@ fn memos_prevents_component_rerun() {
         assert_eq!(current_counter.component, 2);
         assert_eq!(current_counter.memo, 3);
     }
+
+    dom.in_scope(ScopeId(3), || {
+        assert!(consume_context::<ErrorContext>().error().is_none())
+    });
 }
 
 // Regression test for https://github.com/DioxusLabs/dioxus/issues/2990