Fixed test cases (#7643)

Author: limingxinleo

src/Component/ComponentAttributeBag.php

@@ -21,12 +21,13 @@
 use Hyperf\ViewEngine\HtmlString;
 use Hyperf\ViewEngine\T;
 use IteratorAggregate;
+use Stringable;
 use Traversable;
 
 use function Hyperf\Collection\collect;
 use function Hyperf\Support\value;
 
-class ComponentAttributeBag implements ArrayAccess, Htmlable, IteratorAggregate
+class ComponentAttributeBag implements Stringable, ArrayAccess, Htmlable, IteratorAggregate
 {
     use Macroable;
 

src/HtmlString.php

@@ -13,8 +13,9 @@
 namespace Hyperf\ViewEngine;
 
 use Hyperf\ViewEngine\Contract\Htmlable;
+use Stringable;
 
-class HtmlString implements Htmlable
+class HtmlString implements Stringable, Htmlable
 {
     /**
      * Create a new HTML string instance.

src/View.php

@@ -23,9 +23,10 @@
 use Hyperf\ViewEngine\Contract\Htmlable;
 use Hyperf\ViewEngine\Contract\Renderable;
 use Hyperf\ViewEngine\Contract\ViewInterface;
+use Stringable;
 use Throwable;
 
-class View implements ArrayAccess, Htmlable, ViewInterface
+class View implements Stringable, ArrayAccess, Htmlable, ViewInterface
 {
     use Macroable {
         __call as macroCall;