The saml module deserves some love. It's part of the core, so it should also be unit tested.

tools/phpunit/phpunit.xml

@@ -18,6 +18,7 @@
         <whitelist processUncoveredFilesFromWhitelist="true">
             <directory suffix=".php">./../../lib/</directory>
             <directory suffix=".php">./../../modules/core/lib/</directory>
+            <directory suffix=".php">./../../modules/saml/lib/</directory>
             <exclude>
                 <directory>./../../vendor/</directory>
                 <directory>./../../tests/</directory>