Update JunitXmlLogger.php

sebastianbergmann/phpunit#6098

Author: nuernbergerA

overrides/Logging/JUnit/JunitXmlLogger.php

@@ -27,6 +27,7 @@
 use PHPUnit\Event\Test\MarkedIncomplete;
 use PHPUnit\Event\Test\PreparationStarted;
 use PHPUnit\Event\Test\Prepared;
+use PHPUnit\Event\Test\PrintedUnexpectedOutput;
 use PHPUnit\Event\Test\Skipped;
 use PHPUnit\Event\TestSuite\Started;
 use PHPUnit\Event\UnknownSubscriberTypeException;
@@ -207,6 +208,18 @@ public function testPrepared(): void
         $this->prepared = true;
     }
 
+    public function testPrintedUnexpectedOutput(PrintedUnexpectedOutput $event): void
+    {
+        assert($this->currentTestCase !== null);
+
+        $systemOut = $this->document->createElement(
+            'system-out',
+            Xml::prepareString($event->output()),
+        );
+
+        $this->currentTestCase->appendChild($systemOut);
+    }
+
     /**
      * @throws InvalidArgumentException
      */
@@ -301,6 +314,7 @@ private function registerSubscribers(Facade $facade): void
             new TestPreparationStartedSubscriber($this),
             new TestPreparationFailedSubscriber($this),
             new TestPreparedSubscriber($this),
+            new TestPrintedUnexpectedOutputSubscriber($this),
             new TestFinishedSubscriber($this),
             new TestErroredSubscriber($this),
             new TestFailedSubscriber($this),