test: add tests for the useApplication hook

test/e2e/hooks/useApplication.test.tsx

@@ -0,0 +1,67 @@
+import type { ReactNode } from 'react'
+import {
+    describe,
+    expect,
+    it,
+} from 'vitest';
+import {
+    render,
+    renderHook,
+} from '@testing-library/react'
+import { Application as PixiApplication } from 'pixi.js';
+
+import { Application } from '../../../src/components/Application.ts'
+import { useApplication } from '../../../src/hooks/useApplication.ts'
+
+describe('useApplication', () =>
+{
+    it('returns the nearest application', async () =>
+    {
+        let initApp: PixiApplication | null = null
+        let testApp: PixiApplication | null = null
+
+        const TestComponentWrapper = (props: {
+            children?: ReactNode,
+        }) => {
+            const { children } = props
+
+            const handleInit = (app: PixiApplication) => (initApp = app)
+
+            return (
+                <Application onInit={handleInit}>
+                    {children}
+                </Application>
+            )
+        }
+
+        const TestComponent = () => {
+            const { app } = useApplication()
+
+            if (app) {
+                testApp = app
+            }
+
+            return null
+        }
+
+        render(<TestComponent />, {
+            wrapper: TestComponentWrapper,
+        })
+
+        await new Promise<void>(resolve => {
+            let intervalID = setInterval(() => {
+                if (initApp) {
+                    clearInterval(intervalID)
+                    setTimeout(resolve, 10)
+                }
+            }, 10)
+        })
+
+        expect(testApp).to.equal(initApp)
+    })
+
+    it('throws when not in a React Pixi tree', () =>
+    {
+        expect(() => renderHook(() => useApplication())).to.throw(Error, /no context found/i)
+    });
+});

vitest.workspace.ts

@@ -24,5 +24,5 @@ export default defineWorkspace([
                 './vitest.setup.ts'
             ],
         },
-    }
+    },
 ]);