Added XML Schema testing support

Author: wouterj

src/Symfony/Cmf/Component/Testing/Unit/Constraint/SchemaAcceptsXml.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Symfony\Cmf\Component\Testing\Unit\Constraint;
+
+class SchemaAcceptsXml extends \PHPUnit_Framework_Constraint
+{
+    protected $schemaFile;
+
+    public function __construct($schemaFile)
+    {
+        $this->schemaFile = $schemaFile;
+    }
+
+    public function matches($others)
+    {
+        foreach ($others as $other) {
+            $configElement = $other->getElementsByTagName('config');
+
+            if (1 !== count($configElement)) {
+                throw new \InvalidArgumentException('Can only test a file if it contains 1 <config> elements, %d given', count($configElement));
+            }
+
+            $configDom = new \DomDocument();
+            $configDom->appendChild($configDom->importNode($configElement->item(0), true));
+
+            if (!$configDom->schemaValidate($this->schemaFile)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public function toString()
+    {
+        return sprintf('is accepted by the XML schema "%s"', $this->schemaFile);
+    }
+}

src/Symfony/Cmf/Component/Testing/Unit/XmlSchemaTestCase.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Symfony\Cmf\Component\Testing\Unit;
+
+class XmlSchemaTestCase extends \PHPUnit_Framework_TestCase
+{
+    public static function assertSchemaAcceptsXml($xmlDoms, $schemaPath, $message = '')
+    {
+        if (!is_array($xmlDoms)) {
+            $xmlDoms = array($xmlDoms);
+        }
+
+        $xmlDoms = array_map(function ($dom) {
+            if (is_string($dom)) {
+                $xml = $dom;
+                $dom = new \DOMDocument();
+                $dom->load($xml);
+
+                return $dom;
+            }
+            
+            if (!$dom instanceof DOMDocument) {
+                throw new \InvalidArgumentException('The first argument of assertSchemaAcceptsXml should be instances of \DOMDocument, "%s" given', get_class($xml));
+            }
+        }, $xmlDoms);
+
+        return self::assertThat($xmlDoms, new Constraint\SchemaAcceptsXml($schemaPath), $message);
+    }
+}