test: improve unmounted app check

test/e2e/components/Application.test.tsx

@@ -9,6 +9,7 @@ import { render } from '@testing-library/react';
 import { useEffect } from 'react';
 
 import { Application } from '../../../src/components/Application';
+import { isAppMounted } from '../../utils/isAppMounted';
 import { useApplication } from '../../../src/hooks/useApplication';
 
 describe('Application', () => {
@@ -65,7 +66,7 @@ describe('Application', () => {
 
             unmount();
 
-            await expect.poll(() => Boolean(testApp.renderer && testApp.stage)).toBeFalsy();
+            await expect.poll(() => isAppMounted(testApp)).toBeFalsy();
         });
 
         it('unmounts during init', async () => {
@@ -106,7 +107,7 @@ describe('Application', () => {
 
             unmount();
 
-            await expect.poll(() => Boolean(testApp.renderer && testApp.stage)).toBeFalsy();
+            await expect.poll(() => isAppMounted(testApp)).toBeFalsy();
         });
     });
 });

test/utils/getAppRoot.ts

@@ -0,0 +1,19 @@
+import { type Application as PixiApplication } from 'pixi.js';
+import { roots } from '../../src/core/roots';
+import { type Root } from '../../src/typedefs/Root';
+
+export function getAppRoot(app: PixiApplication)
+{
+    let root: Root | undefined;
+
+    for (const oRoot of roots.values())
+    {
+        if (oRoot.applicationState.app === app)
+        {
+            root = oRoot;
+            break;
+        }
+    }
+
+    return root;
+}

test/utils/isAppMounted.ts

@@ -0,0 +1,22 @@
+import { type Application as PixiApplication } from 'pixi.js';
+import { getAppRoot } from './getAppRoot';
+
+export function isAppMounted(app: PixiApplication)
+{
+    if (app.stage === null)
+    {
+        return false;
+    }
+
+    if (app.renderer === null)
+    {
+        return false;
+    }
+
+    if (typeof getAppRoot(app) === 'undefined')
+    {
+        return false;
+    }
+
+    return true;
+}