[9.x] Fix deprecation warnings in tests (#44992)

* Update CompilesFragments.php

* Apply fixes from StyleCI

* Update ComponentTest.php

* Apply fixes from StyleCI

Co-authored-by: StyleCI Bot <[email protected]>

Author: driesvints

src/Illuminate/View/Compilers/Concerns/CompilesFragments.php

@@ -4,6 +4,13 @@
 
 trait CompilesFragments
 {
+    /**
+     * The last compiled fragment.
+     *
+     * @var string
+     */
+    protected $lastFragment;
+
     /**
      * Compile the fragment statements into valid PHP.
      *

tests/View/ComponentTest.php

@@ -117,6 +117,8 @@ public function testResolveDependenciesWithoutContainer()
 
         $component = new class extends Component
         {
+            public $content;
+
             public function __construct($a = null, $b = null)
             {
                 $this->content = $a.$b;