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/object-storage/tests/storage_config_test.rs

@@ -0,0 +1,44 @@
+use object_storage::StorageConfig;
+
+fn local_section(dir: &std::path::Path) -> config::StorageConfig {
+    config::StorageConfig {
+        backend: "local".into(),
+        path: dir.to_str().unwrap().into(),
+        ..Default::default()
+    }
+}
+
+#[test]
+fn local_store_creates_dir_and_succeeds() {
+    let dir = std::env::temp_dir().join(format!("image_test_{}", uuid::Uuid::new_v4()));
+    let result = StorageConfig::from_config(&local_section(&dir));
+    assert!(result.is_ok(), "expected Ok, got: {:?}", result.err());
+    assert!(dir.exists(), "directory should have been created");
+}
+
+#[test]
+fn local_store_succeeds_if_dir_already_exists() {
+    let dir = std::env::temp_dir().join(format!("image_test_{}", uuid::Uuid::new_v4()));
+    std::fs::create_dir_all(&dir).unwrap();
+    let result = StorageConfig::from_config(&local_section(&dir));
+    assert!(result.is_ok());
+}
+
+#[test]
+fn s3_backend_requires_endpoint() {
+    let section = config::StorageConfig {
+        backend: "s3".into(),
+        ..Default::default()
+    };
+    let err = StorageConfig::from_config(&section).err().unwrap();
+    assert!(err.to_string().contains("MINIO_ENDPOINT required"));
+}
+
+#[test]
+fn unknown_backend_is_error() {
+    let section = config::StorageConfig {
+        backend: "ftp".into(),
+        ..Default::default()
+    };
+    assert!(StorageConfig::from_config(&section).is_err());
+}