test: move small adapter tests to tests/

event-publisher, export, rss, media-server, object-storage, nats(config).
Kept inline (private fn, no public path): nats src/subject.rs
tests::{review_logged_subject,review_updated_subject,movie_discovered_subject,
consumer_subject_filter_appends_wildcard} - event_to_subject/consumer_subject_filter private.
object-storage build_local_store tests rewritten via StorageConfig::from_config.

crates/adapters/nats/tests/nats_config_test.rs

@@ -0,0 +1,40 @@
+use nats::{NatsConfig, NatsMode};
+
+fn section(url: Option<&str>, mode: &str) -> config::NatsConfig {
+    config::NatsConfig {
+        url: url.map(str::to_owned),
+        mode: mode.into(),
+        ..Default::default()
+    }
+}
+
+#[test]
+fn errors_without_nats_url() {
+    assert!(NatsConfig::from_config(&config::NatsConfig::default()).is_err());
+}
+
+#[test]
+fn defaults_with_only_url() {
+    let cfg = NatsConfig::from_config(&config::NatsConfig {
+        url: Some("nats://localhost:4222".into()),
+        ..Default::default()
+    })
+    .unwrap();
+    assert_eq!(cfg.url, "nats://localhost:4222");
+    assert_eq!(cfg.mode, NatsMode::JetStream);
+    assert_eq!(cfg.subject_prefix, "movies-diary.events");
+    assert_eq!(cfg.stream_name, "MOVIES_DIARY_EVENTS");
+    assert_eq!(cfg.consumer_name, "worker");
+}
+
+#[test]
+fn core_mode_parsed() {
+    let cfg = NatsConfig::from_config(&section(Some("nats://test:4222"), "core")).unwrap();
+    assert_eq!(cfg.url, "nats://test:4222");
+    assert_eq!(cfg.mode, NatsMode::Core);
+}
+
+#[test]
+fn invalid_mode_errors() {
+    assert!(NatsConfig::from_config(&section(Some("nats://test:4222"), "kafka")).is_err());
+}