[12.x] Fix event helper (#56773)

* Revert event helper return type

* Add test

* unnecessary comment

Author: jasonvarga

src/Illuminate/Foundation/helpers.php

@@ -499,7 +499,7 @@ function encrypt($value, $serialize = true): string
      * @param  mixed  $payload
      * @param  bool  $halt
      */
-    function event(...$args): ?array
+    function event(...$args)
     {
         return app('events')->dispatch(...$args);
     }

tests/Foundation/FoundationHelpersTest.php

@@ -7,6 +7,7 @@
 use Illuminate\Container\Container;
 use Illuminate\Contracts\Cache\Repository as CacheRepository;
 use Illuminate\Contracts\Config\Repository;
+use Illuminate\Contracts\Events\Dispatcher;
 use Illuminate\Contracts\Support\Responsable;
 use Illuminate\Foundation\Application;
 use Illuminate\Foundation\Mix;
@@ -49,6 +50,15 @@ public function testCache()
         $this->assertSame('default', cache('baz', 'default'));
     }
 
+    public function testEvents()
+    {
+        $app = new Application;
+        $app['events'] = $dispatcher = m::mock(Dispatcher::class);
+
+        $dispatcher->shouldReceive('dispatch')->once()->with('a', 'b', 'c')->andReturn('foo');
+        $this->assertSame('foo', event('a', 'b', 'c'));
+    }
+
     public function testMixDoesNotIncludeHost()
     {
         $app = new Application;