diff --git a/src/lib.rs b/src/lib.rs
index c9b6ecd..a0ebf04 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1054,6 +1054,25 @@ mod tests {
         Ok(())
     }
 
+    #[test]
+    fn search_config_builder_methods_populate_fields() {
+        let config = SearchConfig::new("https://example.com")
+            .unwrap()
+            .with_blocklist(["badsite.com", "spam.org"])
+            .with_allowlist(["goodsite.com"])
+            .with_timeout(std::time::Duration::from_secs(10))
+            .with_cache(100, std::time::Duration::from_secs(300));
+
+        assert_eq!(
+            config.blocklist,
+            vec!["badsite.com".to_owned(), "spam.org".to_owned()]
+        );
+        assert_eq!(config.allowlist, vec!["goodsite.com".to_owned()]);
+        assert_eq!(config.timeout, std::time::Duration::from_secs(10));
+        assert_eq!(config.cache_capacity, 100);
+        assert_eq!(config.cache_ttl, std::time::Duration::from_secs(300));
+    }
+
     #[test]
     fn search_config_from_url_validates_scheme_and_credentials() -> Result<(), url::ParseError> {
         // Valid URLs
@@ -1333,7 +1352,10 @@ mod tests {
             filters: SearchFilters::default(),
         };
 
-        client.cache.insert("rust".to_owned(), dummy_response);
+        client.cache.insert(
+            (false, SearchMode::Balanced, "rust".to_owned()),
+            dummy_response,
+        );
         assert_eq!(client.cached_entries(), 1);
 
         client.clear_cache();