Enable psalm check for tests folder

sandrokeil · sandrokeil · commit f08e1264c64f · 2021-01-30T17:14:18.000+01:00
diff --git a/psalm.xml b/psalm.xml
@@ -9,6 +9,7 @@
 >
     <projectFiles>
         <directory name="src" />
+        <directory name="tests" />
         <ignoreFiles>
             <directory name="vendor" />
         </ignoreFiles>
