Improve phpdoc & error message

Author: tvdijen

src/XML/md/SPSSODescriptor.php

@@ -98,7 +98,9 @@ public function __construct(
             'All md:AttributeConsumingService endpoints must be an instance of AttributeConsumingService.',
         );
 
-        // test that only one ACS is marked as default
+        /**
+         * E87:  test that only one ACS is marked as default
+         */
         Assert::maxCount(
             array_filter(
                 $attributeConsumingService,
@@ -107,7 +109,7 @@ function (AttributeConsumingService $acs) {
                 },
             ),
             1,
-            'Only one md:AttributeConsumingService can be set as default.',
+            'At most one <AttributeConsumingService> element can have the attribute isDefault set to true.',
         );
     }
 

tests/SAML2/XML/md/SPSSODescriptorTest.php

@@ -286,7 +286,9 @@ public function testUnmarshallingTwoDefaultACS(): void
         $acs->item(1)->setAttribute('isDefault', 'true');
 
         $this->expectException(AssertionFailedException::class);
-        $this->expectExceptionMessage('Only one md:AttributeConsumingService can be set as default.');
+        $this->expectExceptionMessage(
+            'At most one <AttributeConsumingService> element can have the attribute isDefault set to true.',
+        );
 
         SPSSODescriptor::fromXML($xmlRepresentation->documentElement);
     }