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/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 {