Use VNode approach in a11y tests where we were wrapping component under test in div

src/sidebar/components/ShareDialog/test/ImportAnnotations-test.js

@@ -339,15 +339,12 @@ describe('ImportAnnotations', () => {
   it(
     'should pass a11y checks',
     checkAccessibility({
-      content: () =>
-        mount(
-          // re. outer div, see https://github.com/hypothesis/client/issues/5690
-          <div>
+      // re. not using `mount`, see https://github.com/hypothesis/client/issues/5690
+      content: () => (
         <ImportAnnotations
           store={fakeStore}
           importAnnotationsService={fakeImportAnnotationsService}
         />
-          </div>,
       ),
     }),
   );

src/sidebar/components/ShareDialog/test/ShareDialog-test.js

@@ -126,17 +126,11 @@ describe('ShareDialog', () => {
     it(
       'should pass a11y checks',
       checkAccessibility({
-        content: () =>
         // ShareDialog renders a Fragment as its top-level component when
         // it has import and/or export tabs.
-          // Wrapping it in a `div` ensures `checkAccessibility` internal logic
-          // does not discard all the Fragment children but the first one.
+        // Returning the VNode verbatim ensures no children are discarded.
         // See https://github.com/hypothesis/client/issues/5671
-          mount(
-            <div>
-              <ShareDialog shareTab exportTab importTab />
-            </div>,
-          ),
+        content: () => <ShareDialog shareTab exportTab importTab />,
       }),
     );
   });

src/sidebar/components/test/ThreadList-test.js

@@ -418,10 +418,7 @@ describe('ThreadList', () => {
   it(
     'should pass a11y checks',
     checkAccessibility({
-      content: () => {
-        const wrapper = createComponent();
-        return wrapper;
-      },
+      content: () => createComponent(),
     }),
   );
 });