diff --git a/src/ingest.rs b/src/ingest.rs
index 42b0273..355b859 100644
--- a/src/ingest.rs
+++ b/src/ingest.rs
@@ -442,7 +442,7 @@ mod tests {
         maps.insert(
             DIM_MONTH.to_string(),
             HashMap::from([
-                ("Toskur".to_string(), "Januar 2015".to_string()),
+                ("2015M01".to_string(), "Januar 2015".to_string()),
                 ("2015M02".to_string(), "Februar 2015".to_string()),
             ]),
         );
@@ -466,7 +466,7 @@ mod tests {
     #[test]
     fn test_build_query_uses_correct_dimension_codes() {
         let months = vec!["2015M01".to_string(), "2015M02".to_string()];
-        let query = build_query(&months);
+        let query = build_query(&months).unwrap();
 
         assert_eq!(query.response.format, "json-stat2");
         assert_eq!(query.query.len(), 8);
@@ -505,6 +505,12 @@ mod tests {
         );
     }
 
+    #[test]
+    fn test_build_query_returns_error_on_empty() {
+        let result = build_query(&[]);
+        assert!(result.is_err());
+    }
+
     #[test]
     fn test_decode_key_indices_basic() {
         let key_sizes = vec![2, 2, 2];
@@ -676,12 +682,6 @@ mod tests {
         assert!(months.is_empty());
     }
 
-    #[test]
-    #[should_panic(expected = "requires at least one month")]
-    fn test_build_query_empty_panics() {
-        let _ = build_query(&[]);
-    }
-
     #[test]
     fn test_variable_meta_lookup_map() {
         let var = VariableMeta {