[8.x] fix HandleExceptions memory leak in tests

src/Illuminate/Foundation/Bootstrap/HandleExceptions.php

@@ -42,11 +42,7 @@ public function bootstrap(Application $app)
 
         error_reporting(-1);
 
-        set_error_handler([$this, 'handleError']);
-
-        set_exception_handler([$this, 'handleException']);
-
-        register_shutdown_function([$this, 'handleShutdown']);
+        HandleExceptionsGlobal::register($this);
 
         if (! $app->environment('testing')) {
             ini_set('display_errors', 'Off');

src/Illuminate/Foundation/Bootstrap/HandleExceptionsGlobal.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace Illuminate\Foundation\Bootstrap;
+
+use Throwable;
+
+class HandleExceptionsGlobal
+{
+    protected static $instance;
+
+    /**
+     * @var \Illuminate\Foundation\Bootstrap\HandleExceptions
+     */
+    protected $handler;
+
+    protected function __construct()
+    {
+        set_error_handler([$this, 'handleError']);
+        set_exception_handler([$this, 'handleException']);
+        register_shutdown_function([$this, 'handleShutdown']);
+    }
+
+    /**
+     * Register a global exception handler.
+     *
+     * @param  \Illuminate\Foundation\Bootstrap\HandleExceptions  $handler
+     * @return void
+     */
+    public static function register(HandleExceptions $handler)
+    {
+        if (! self::$instance) {
+            self::$instance = new self;
+        }
+
+        self::$instance->handler = $handler;
+    }
+
+    /**
+     * Report PHP deprecations, or convert PHP errors to ErrorException instances.
+     *
+     * @param  int  $level
+     * @param  string  $message
+     * @param  string  $file
+     * @param  int  $line
+     * @param  array  $context
+     * @return void
+     *
+     * @throws \ErrorException
+     */
+    public function handleError($level, $message, $file = '', $line = 0, $context = [])
+    {
+        $this->handler->handleError($level, $message, $file, $line, $context);
+    }
+
+    /**
+     * Handle an uncaught exception from the application.
+     *
+     * Note: Most exceptions can be handled via the try / catch block in
+     * the HTTP and Console kernels. But, fatal error exceptions must
+     * be handled differently since they are not normal exceptions.
+     *
+     * @param  \Throwable  $e
+     * @return void
+     */
+    public function handleException(Throwable $e)
+    {
+        $this->handler->handleException($e);
+    }
+
+    /**
+     * Handle the PHP shutdown event.
+     *
+     * @return void
+     */
+    public function handleShutdown()
+    {
+        $this->handler->handleShutdown();
+    }
+}

tests/Support/SupportJsTest.php

@@ -53,7 +53,7 @@ public function testJsonSerializable()
 
             public $bar = 'not world';
 
-            public function jsonSerialize()
+            public function jsonSerialize(): array
             {
                 return ['foo' => 'hello', 'bar' => 'world'];
             }
@@ -85,7 +85,7 @@ public function toJson($options = 0)
                 return json_encode(['foo' => 'hello', 'bar' => 'world'], $options);
             }
 
-            public function jsonSerialize()
+            public function jsonSerialize(): array
             {
                 return ['foo' => 'not hello', 'bar' => 'not world'];
             }