style: exclude test files from unused variable rule

Author: alies-dev

IxDFCodingStandard/ruleset.xml

@@ -352,7 +352,10 @@
     <rule ref="SlevomatCodingStandard.Variables.DisallowSuperGlobalVariable"/>
     <rule ref="SlevomatCodingStandard.Variables.DisallowVariableVariable"/>
     <rule ref="SlevomatCodingStandard.Variables.DuplicateAssignmentToVariable"/>
-    <rule ref="SlevomatCodingStandard.Variables.UnusedVariable"/>
+    <rule ref="SlevomatCodingStandard.Variables.UnusedVariable">
+        <!-- Tests often keep intermediate variables for readability (e.g. unused factory results) -->
+        <exclude-pattern>*/tests/*</exclude-pattern>
+    </rule>
     <rule ref="SlevomatCodingStandard.Whitespaces.DuplicateSpaces"/>
     <!-- SlevomatCoding end. -->