check feed validity at w3c validator

_test/tests/Feed/FeedCreatorValidationTest.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace dokuwiki\test\Feed;
+
+use dokuwiki\Feed\FeedCreator;
+use dokuwiki\Feed\FeedCreatorOptions;
+use dokuwiki\HTTP\DokuHTTPClient;
+
+/**
+ * @group internet
+ */
+class FeedCreatorTest extends \DokuWikiTest
+{
+
+    /**
+     * @todo This only test the default feed, various configurations could be tested
+     *
+     * @return void
+     * @throws \Exception
+     */
+    public function testValidate()
+    {
+
+        $options = new FeedCreatorOptions();
+        $creator = new FeedCreator($options);
+        $feed = $creator->build();
+
+        $http = new DokuHTTPClient();
+        $result = $http->post('https://validator.w3.org/feed/check.cgi', [
+            'rawdata' => $feed,
+            'output' => 'soap12',
+        ]);
+
+        if (!$result) {
+            $this->markTestSkipped('Could not validate feed');
+        }
+        //print($result);
+
+        $xml = new \SimpleXMLElement($result);
+        $ns = $xml->getNamespaces(true);
+        foreach ($ns as $key => $value) {
+            $xml->registerXPathNamespace($key, $value);
+        }
+
+        $warningCount = (int)$xml->xpath('//m:warnings/m:warningcount')[0];
+        if ($warningCount > 0) {
+            $line = (int)$xml->xpath('//m:warnings/m:warninglist/warning/line')[0];
+            $text = (string)$xml->xpath('//m:warnings/m:warninglist/warning/text')[0];
+            $element = (string)$xml->xpath('//m:warnings/m:warninglist/warning/element')[0];
+            $parent = (string)$xml->xpath('//m:warnings/m:warninglist/warning/parent')[0];
+
+            $lines = explode("\n", $feed);
+            $show = trim($lines[$line - 1]);
+
+            $this->addWarning(
+                "Feed validation produced a warning:\n" .
+                "Line $line: $text\n" .
+                "$parent -> $element\n" .
+                $show
+            );
+        }
+
+        $errorCount = (int)$xml->xpath('//m:errors/m:errorcount')[0];
+        if ($errorCount > 0) {
+            $line = (int)$xml->xpath('//m:errors/m:errorlist/error/line')[0];
+            $text = (string)$xml->xpath('//m:errors/m:errorlist/error/text')[0];
+            $element = (string)$xml->xpath('//m:errors/m:errorlist/error/element')[0];
+            $parent = (string)$xml->xpath('//m:errors/m:errorlist/error/parent')[0];
+
+            $lines = explode("\n", $feed);
+            $show = trim($lines[$line - 1]);
+
+            $this->fail(
+                "Feed validation produced an error:\n" .
+                "Line $line: $text\n" .
+                "$parent -> $element\n" .
+                $show
+            );
+        }
+
+        $this->assertTrue(true);
+    }
+
+
+}