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/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