test(app, e2e): add redbox detection, probe firestore shutdown

This correctly identifies that #5225 can happen, where previously
it passed CI with no problem. Tested by applying / removing the fix
for 5225 and now CI will fail if a redbox ever happens again

packages/firestore/e2e/issues.e2e.js

@@ -91,5 +91,10 @@ describe('firestore()', function () {
         }
       });
     });
+
+    it('issue 5225 - app reloads successfully', async function () {
+      // Reload causes the TaskExecutor to shut down, make sure it does not error
+      await device.reloadReactNative();
+    });
   });
 });

tests/e2e/init.js

@@ -49,6 +49,13 @@ beforeEach(async function beforeEach() {
   }
 });
 
+// Make sure we the app is still visible (that is, no redbox) after each test
+afterEach(async function afterEach() {
+  await waitFor(element(by.id('welcome')).atIndex(0)) // the testID for the Root View in app.js
+    .toBeVisible()
+    .withTimeout(10000); // If app reloads, it takes some time to re-display
+});
+
 after(async function () {
   console.log(' ✨ Tests Complete ✨ ');
   await device.terminateApp();