[10.x] Use HtmlString in Vite fake (#49163)

* use htmlstring

* test

Author: jasonvarga

src/Illuminate/Foundation/Testing/Concerns/InteractsWithContainer.php

@@ -117,7 +117,7 @@ protected function withoutVite()
         {
             public function __invoke($entrypoints, $buildDirectory = null)
             {
-                return '';
+                return new HtmlString('');
             }
 
             public function __call($method, $parameters)

tests/Foundation/Testing/Concerns/InteractsWithContainerTest.php

@@ -13,7 +13,7 @@ public function testWithoutViteBindsEmptyHandlerAndReturnsInstance()
     {
         $instance = $this->withoutVite();
 
-        $this->assertSame('', app(Vite::class)(['resources/js/app.js']));
+        $this->assertSame('', app(Vite::class)(['resources/js/app.js'])->toHtml());
         $this->assertSame($this, $instance);
     }