bug #15866 [VarDumper] Fix dump comparison on large arrays (romainneutron)

This PR was merged into the 2.7 branch.

Discussion
----------

[VarDumper] Fix dump comparison on large arrays

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT

Commits
-------

6a6e7f3 [VarDumper] Fix dump comparison on large arrays

src/Symfony/Component/VarDumper/Test/VarDumperTestTrait.php

@@ -33,6 +33,7 @@ trait VarDumperTestTrait
     {
         $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));

src/Symfony/Component/VarDumper/Tests/Test/VarDumpTestTraitRequire54.php

@@ -0,0 +1,41 @@
+<?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\Test;
+
+use Symfony\Component\VarDumper\Test\VarDumperTestCase;
+use Symfony\Component\VarDumper\Test\VarDumperTestTrait;
+
+class VarDumperTestTraitTest extends VarDumperTestCase
+{
+    use VarDumperTestTrait;
+
+    public function testItComparesLargeData()
+    {
+        $howMany = 700;
+        $data = array_fill_keys(range(0, $howMany), array('a', 'b', 'c', 'd'));
+
+        $expected = sprintf("array:%d [\n", $howMany + 1);
+        for ($i = 0; $i <= $howMany; ++$i) {
+            $expected .= <<<EODUMP
+  $i => array:4 [
+    0 => "a"
+    1 => "b"
+    2 => "c"
+    3 => "d"
+  ]\n
+EODUMP;
+        }
+        $expected .= "]\n";
+
+        $this->assertDumpEquals($expected, $data);
+    }
+}

src/Symfony/Component/VarDumper/Tests/Test/VarDumpTestTraitTest.php

@@ -0,0 +1,16 @@
+<?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.
+ */
+
+// Skipping trait tests for PHP < 5.4
+if (version_compare(PHP_VERSION, '5.4.0-dev', '>=')) {
+    require 'VarDumpTestTraitRequire54.php';
+}
+