diff --git a/src/test/java/org/gcube/accounting/datamodel/validations/validators/TestRules.java b/src/test/java/org/gcube/accounting/datamodel/validations/validators/TestRules.java
index 9df3a89..e93aff1 100644
--- a/src/test/java/org/gcube/accounting/datamodel/validations/validators/TestRules.java
+++ b/src/test/java/org/gcube/accounting/datamodel/validations/validators/TestRules.java
@@ -51,6 +51,7 @@ public class TestRules {
 			"SimulFishGrowthData-Site",
 			"SimulFishGrowthData-Species",
 			"SimulFishGrowthData-UNKNOWN",
+			"storage-UNKNOWN",
 			"TagMe-tag"
 		};
 		
@@ -95,7 +96,7 @@ public class TestRules {
 	
 	@Test
 	public void testSingleRule() throws Exception {
-		testRule("SimulFishGrowthData-Site");
+		testRule("storage-UNKNOWN");
 	}
 	
 }
diff --git a/src/test/resources/rules/storage-UNKNOWN-rule.json b/src/test/resources/rules/storage-UNKNOWN-rule.json
new file mode 100644
index 0000000..e1bc68c
--- /dev/null
+++ b/src/test/resources/rules/storage-UNKNOWN-rule.json
@@ -0,0 +1,12 @@
+{
+	"match": {
+		"serviceClassRegex": "content-management",
+		"serviceNameRegex": "storage",
+		"calledMethodRegex": ".*"
+	},
+	"replace": {
+		"serviceClass": "content-management",
+		"serviceName": "storage",
+		"calledMethod": "UNKNOWN"
+	}
+}
\ No newline at end of file
diff --git a/src/test/resources/rules/storage-UNKNOWN-values.csv b/src/test/resources/rules/storage-UNKNOWN-values.csv
new file mode 100644
index 0000000..b375ca1
--- /dev/null
+++ b/src/test/resources/rules/storage-UNKNOWN-values.csv
@@ -0,0 +1,8 @@
+content-management,storage,/rest/resources
+content-management,storage,/rest/resources/
+content-management,storage,/rest/resources/58c6701b7c1b605b68964500
+content-management,storage,/rest/resources/58c6717a7c1b605b68964500
+content-management,storage,/rest/resources/58c6717a7c1b605b68964501
+content-management,storage,/rest/resources/add
+content-management,storage,/rest/resources58c045237c1b604d593ba3c2
+content-management,storage,UNKNOWN
\ No newline at end of file