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diff --git a/vendor/symfony/var-dumper/Tests/VarClonerTest.php b/vendor/symfony/var-dumper/Tests/VarClonerTest.php
new file mode 100644
index 000000000..8ca59bddd
--- /dev/null
+++ b/vendor/symfony/var-dumper/Tests/VarClonerTest.php
@@ -0,0 +1,258 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\VarDumper\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\VarDumper\Cloner\VarCloner;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class VarClonerTest extends TestCase
+{
+    public function testMaxIntBoundary()
+    {
+        $data = array(PHP_INT_MAX => 123);
+
+        $cloner = new VarCloner();
+        $clone = $cloner->cloneVar($data);
+
+        $expected = <<<EOTXT
+Symfony\Component\VarDumper\Cloner\Data Object
+(
+    [data:Symfony\Component\VarDumper\Cloner\Data:private] => Array
+        (
+            [0] => Array
+                (
+                    [0] => Symfony\Component\VarDumper\Cloner\Stub Object
+                        (
+                            [type] => array
+                            [class] => assoc
+                            [value] => 1
+                            [cut] => 0
+                            [handle] => 0
+                            [refCount] => 0
+                            [position] => 1
+                        )
+
+                )
+
+            [1] => Array
+                (
+                    [%s] => 123
+                )
+
+        )
+
+    [maxDepth:Symfony\Component\VarDumper\Cloner\Data:private] => 20
+    [maxItemsPerDepth:Symfony\Component\VarDumper\Cloner\Data:private] => -1
+    [useRefHandles:Symfony\Component\VarDumper\Cloner\Data:private] => -1
+)
+
+EOTXT;
+        $this->assertSame(sprintf($expected, PHP_INT_MAX), print_r($clone, true));
+    }
+
+    public function testClone()
+    {
+        $json = json_decode('{"1":{"var":"val"},"2":{"var":"val"}}');
+
+        $cloner = new VarCloner();
+        $clone = $cloner->cloneVar($json);
+
+        $expected = <<<EOTXT
+Symfony\Component\VarDumper\Cloner\Data Object
+(
+    [data:Symfony\Component\VarDumper\Cloner\Data:private] => Array
+        (
+            [0] => Array
+                (
+                    [0] => Symfony\Component\VarDumper\Cloner\Stub Object
+                        (
+                            [type] => object
+                            [class] => stdClass
+                            [value] => 
+                            [cut] => 0
+                            [handle] => %i
+                            [refCount] => 0
+                            [position] => 1
+                        )
+
+                )
+
+            [1] => Array
+                (
+                    [\000+\0001] => Symfony\Component\VarDumper\Cloner\Stub Object
+                        (
+                            [type] => object
+                            [class] => stdClass
+                            [value] => 
+                            [cut] => 0
+                            [handle] => %i
+                            [refCount] => 0
+                            [position] => 2
+                        )
+
+                    [\000+\0002] => Symfony\Component\VarDumper\Cloner\Stub Object
+                        (
+                            [type] => object
+                            [class] => stdClass
+                            [value] => 
+                            [cut] => 0
+                            [handle] => %i
+                            [refCount] => 0
+                            [position] => 3
+                        )
+
+                )
+
+            [2] => Array
+                (
+                    [\000+\000var] => val
+                )
+
+            [3] => Array
+                (
+                    [\000+\000var] => val
+                )
+
+        )
+
+    [maxDepth:Symfony\Component\VarDumper\Cloner\Data:private] => 20
+    [maxItemsPerDepth:Symfony\Component\VarDumper\Cloner\Data:private] => -1
+    [useRefHandles:Symfony\Component\VarDumper\Cloner\Data:private] => -1
+)
+
+EOTXT;
+        $this->assertStringMatchesFormat($expected, print_r($clone, true));
+    }
+
+    public function testJsonCast()
+    {
+        if (ini_get('xdebug.overload_var_dump') == 2) {
+            $this->markTestSkipped('xdebug is active');
+        }
+
+        $data = (array) json_decode('{"1":{}}');
+
+        $cloner = new VarCloner();
+        $clone = $cloner->cloneVar($data);
+
+        $expected = <<<'EOTXT'
+object(Symfony\Component\VarDumper\Cloner\Data)#%i (4) {
+  ["data":"Symfony\Component\VarDumper\Cloner\Data":private]=>
+  array(2) {
+    [0]=>
+    array(1) {
+      [0]=>
+      object(Symfony\Component\VarDumper\Cloner\Stub)#%i (7) {
+        ["type"]=>
+        string(5) "array"
+        ["class"]=>
+        string(5) "assoc"
+        ["value"]=>
+        int(1)
+        ["cut"]=>
+        int(0)
+        ["handle"]=>
+        int(0)
+        ["refCount"]=>
+        int(0)
+        ["position"]=>
+        int(1)
+      }
+    }
+    [1]=>
+    array(1) {
+      ["1"]=>
+      object(Symfony\Component\VarDumper\Cloner\Stub)#%i (7) {
+        ["type"]=>
+        string(6) "object"
+        ["class"]=>
+        string(8) "stdClass"
+        ["value"]=>
+        NULL
+        ["cut"]=>
+        int(0)
+        ["handle"]=>
+        int(%i)
+        ["refCount"]=>
+        int(0)
+        ["position"]=>
+        int(0)
+      }
+    }
+  }
+  ["maxDepth":"Symfony\Component\VarDumper\Cloner\Data":private]=>
+  int(20)
+  ["maxItemsPerDepth":"Symfony\Component\VarDumper\Cloner\Data":private]=>
+  int(-1)
+  ["useRefHandles":"Symfony\Component\VarDumper\Cloner\Data":private]=>
+  int(-1)
+}
+
+EOTXT;
+        ob_start();
+        var_dump($clone);
+        $this->assertStringMatchesFormat($expected, ob_get_clean());
+    }
+
+    public function testCaster()
+    {
+        $cloner = new VarCloner(array(
+            '*' => function ($obj, $array) {
+                return array('foo' => 123);
+            },
+            __CLASS__ => function ($obj, $array) {
+                ++$array['foo'];
+
+                return $array;
+            },
+        ));
+        $clone = $cloner->cloneVar($this);
+
+        $expected = <<<EOTXT
+Symfony\Component\VarDumper\Cloner\Data Object
+(
+    [data:Symfony\Component\VarDumper\Cloner\Data:private] => Array
+        (
+            [0] => Array
+                (
+                    [0] => Symfony\Component\VarDumper\Cloner\Stub Object
+                        (
+                            [type] => object
+                            [class] => %s
+                            [value] => 
+                            [cut] => 0
+                            [handle] => %i
+                            [refCount] => 0
+                            [position] => 1
+                        )
+
+                )
+
+            [1] => Array
+                (
+                    [foo] => 124
+                )
+
+        )
+
+    [maxDepth:Symfony\Component\VarDumper\Cloner\Data:private] => 20
+    [maxItemsPerDepth:Symfony\Component\VarDumper\Cloner\Data:private] => -1
+    [useRefHandles:Symfony\Component\VarDumper\Cloner\Data:private] => -1
+)
+
+EOTXT;
+        $this->assertStringMatchesFormat($expected, print_r($clone, true));
+    }
+}