Expand interoperability-tests

.github/workflows/interoperability.yml

@@ -89,6 +89,13 @@ jobs:
             mkdir -p /tmp/metadata
             wget https://md.aai.grnet.gr/aggregates/grnet-metadata.xml -O /tmp/metadata/grnet.xml
 
+      - name: Download MicrosoftOnline metadata
+        if: steps.cache-metadata.outputs.cache-hit != 'true'
+        run: |
+            mkdir -p /tmp/metadata
+            wget https://nexus.microsoftonline-p.com/federationmetadata/saml20/federationmetadata.xml \
+              -O /tmp/metadata/microsoftonline.xml
+
       - name: Run unit tests
         run: |
           ./vendor/bin/phpunit -c phpunit-interoperability.xml

tests/InterOperability/EntityDescriptorTest.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\Test\SAML2;
+
+use DOMElement;
+use PHPUnit\Framework\Attributes\DataProvider;
+use PHPUnit\Framework\TestCase;
+use SimpleSAML\Assert\AssertionFailedException;
+use SimpleSAML\SAML2\XML\md\EntityDescriptor;
+use SimpleSAML\XML\DOMDocumentFactory;
+
+/**
+ * Class \SimpleSAML\SAML2\EntityDescriptorTest
+ *
+ * @package simplesamlphp\saml2
+ */
+final class EntityDescriptorTest extends TestCase
+{
+    /**
+     * @param boolean $shouldPass
+     * @param \DOMElement $metadata;
+     */
+    #[DataProvider('provideMetadata')]
+    public function testUnmarshalling(bool $shouldPass, DOMElement $metadata): void
+    {
+        try {
+            EntityDescriptor::fromXML($metadata);
+            $this->assertTrue($shouldPass);
+        } catch (AssertionFailedException $e) {
+            fwrite(STDERR, $e->getFile() . '(' . strval($e->getLine()) . '):' . $e->getMessage());
+            fwrite(STDERR, $e->getTraceAsString());
+            $this->assertFalse($shouldPass);
+        }
+    }
+
+
+    /**
+     * @return array
+     */
+    public static function provideMetadata(): array
+    {
+        return [
+            // Known bug: Microsoft doensn't produce a schema-valid XML
+            // This was reported to them in 2022: TrackingID#2210040050001949
+            'MicrosoftOnline' => [
+                true,
+                DOMDocumentFactory::fromFile('/tmp/metadata/microsoftonline.xml')->documentElement,
+            ],
+        ];
+    }
+}