minor #11233 [Serializer] Added a test for decoding xml with whitespaces (florianv)

This PR was merged into the 2.6-dev branch.

Discussion
----------

[Serializer] Added a test for decoding xml with whitespaces

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

The PR symfony/symfony@466a3d7 introduced a BC break because white spaces were previously decoded as text nodes.

So this PR reverts it and adds a context option to configure it.

Commits
-------

f5bf45e [Serializer] Added a test for decoding xml with whitespaces

Author: fabpot

Tests/Encoder/XmlEncoderTest.php

@@ -312,6 +312,29 @@ public function testDecodeArray()
         $this->assertEquals($expected, $this->encoder->decode($source, 'xml'));
     }
 
+    public function testDecodeIgnoreWhiteSpace()
+    {
+        $source = <<<XML
+<?xml version="1.0"?>
+<people>
+    <person>
+        <firstname>Benjamin</firstname>
+        <lastname>Alexandre</lastname>
+    </person>
+    <person>
+        <firstname>Damien</firstname>
+        <lastname>Clay</lastname>
+    </person>
+</people>
+XML;
+        $expected = array('person' => array(
+            array('firstname' => 'Benjamin', 'lastname' => 'Alexandre'),
+            array('firstname' => 'Damien', 'lastname' => 'Clay')
+        ));
+
+        $this->assertEquals($expected, $this->encoder->decode($source, 'xml'));
+    }
+
     public function testDecodeWithoutItemHash()
     {
         $obj = new ScalarDummy();