[8.x] Testing: Access component properties from the return value of $this->component()

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

@@ -5,6 +5,7 @@
 use Illuminate\Support\Facades\View as ViewFacade;
 use Illuminate\Support\MessageBag;
 use Illuminate\Support\ViewErrorBag;
+use Illuminate\Testing\TestComponent;
 use Illuminate\Testing\TestView;
 use Illuminate\View\View;
 
@@ -59,9 +60,11 @@ protected function component(string $componentClass, array $data = [])
 
         $view = value($component->resolveView(), $data);
 
-        return $view instanceof View
-                ? new TestView($view->with($component->data()))
-                : new TestView(view($view, $component->data()));
+        $view = $view instanceof View
+            ? $view->with($component->data())
+            : view($view, $component->data());
+
+        return new TestComponent($component, $view);
     }
 
     /**

src/Illuminate/Testing/TestComponent.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Illuminate\Testing;
+
+use Illuminate\Testing\TestView;
+use Illuminate\View\Component;
+
+
+class TestComponent extends TestView
+{
+  /**
+   * The original view.
+   *
+   * @var \Illuminate\View\Component
+   */
+  protected $component;
+
+  /**
+   * The rendered view contents.
+   *
+   * @var string
+   */
+  protected $rendered;
+
+  /**
+   * Create a new test view instance.
+   *
+   * @param  \Illuminate\View\Component  $view
+   * @return void
+   */
+  public function __construct(Component $component, $view)
+  {
+    $this->component = $component;
+    $this->rendered = $view->render();
+  }
+
+  public function __get($attribute)
+  {
+    return $this->component->{$attribute};
+  }
+}

tests/Foundation/Testing/Concerns/InteractsWithViewsTest.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Tests\Foundation\Testing\Concerns;
 
 use Illuminate\Foundation\Testing\Concerns\InteractsWithViews;
+use Illuminate\View\Component;
 use Orchestra\Testbench\TestCase;
 
 class InteractsWithViewsTest extends TestCase
@@ -15,4 +16,19 @@ public function testBladeCorrectlyRendersString()
 
         $this->assertEquals('test ', $string);
     }
+
+    public function testComponentCanAccessPublicProperties()
+    {
+        $exampleComponent = new class extends Component
+        {
+            public $foo = 'bar';
+            public function render()
+            {
+                return '';
+            }
+        };
+        $component = $this->component(get_class($exampleComponent));
+
+        $this->assertEquals('bar', $component->foo);
+    }
 }