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diff --git a/vendor/symfony/var-dumper/Test/VarDumperTestTrait.php b/vendor/symfony/var-dumper/Test/VarDumperTestTrait.php
new file mode 100644
index 000000000..e5f6bf5b9
--- /dev/null
+++ b/vendor/symfony/var-dumper/Test/VarDumperTestTrait.php
@@ -0,0 +1,45 @@
+<?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\Test;
+
+use Symfony\Component\VarDumper\Cloner\VarCloner;
+use Symfony\Component\VarDumper\Dumper\CliDumper;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+trait VarDumperTestTrait
+{
+    public function assertDumpEquals($dump, $data, $message = '')
+    {
+        $this->assertSame(rtrim($dump), $this->getDump($data), $message);
+    }
+
+    public function assertDumpMatchesFormat($dump, $data, $message = '')
+    {
+        $this->assertStringMatchesFormat(rtrim($dump), $this->getDump($data), $message);
+    }
+
+    protected function getDump($data)
+    {
+        $h = fopen('php://memory', 'r+b');
+        $cloner = new VarCloner();
+        $cloner->setMaxItems(-1);
+        $dumper = new CliDumper($h);
+        $dumper->setColors(false);
+        $dumper->dump($cloner->cloneVar($data)->withRefHandles(false));
+        $data = stream_get_contents($h, -1, 0);
+        fclose($h);
+
+        return rtrim($data);
+    }
+}