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/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())
+        })
     }
 }