[Validator] Fix array notation in the PropertyPath::append()

src/Symfony/Component/Validator/Tests/Util/PropertyPathTest.php

@@ -0,0 +1,35 @@
+<?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\Validator\Tests\Util;
+
+use Symfony\Component\Validator\Util\PropertyPath;
+
+class PropertyPathTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @dataProvider provideAppendPaths
+     */
+    public function testAppend($basePath, $subPath, $expectedPath, $message)
+    {
+        $this->assertSame($expectedPath, PropertyPath::append($basePath, $subPath), $message);
+    }
+
+    public function provideAppendPaths()
+    {
+        return array(
+            array('foo', '', 'foo', 'It returns the basePath if subPath is empty'),
+            array('', 'bar', 'bar', 'It returns the subPath if basePath is empty'),
+            array('foo', 'bar', 'foo.bar', 'It append the subPath to the basePath'),
+            array('foo', '[bar]', 'foo[bar]', 'It does not include the dot separator if subPath uses the array notation')
+        );
+    }
+}

src/Symfony/Component/Validator/Util/PropertyPath.php

@@ -38,7 +38,7 @@ class PropertyPath
     public static function append($basePath, $subPath)
     {
         if ('' !== (string) $subPath) {
-            if ('[' === $subPath{1}) {
+            if ('[' === $subPath{0}) {
                 return $basePath.$subPath;
             }