refactor: move inline tests to separate files via #[path]

crates/adapters/nats/src/tests/config.rs

@@ -0,0 +1,58 @@
+use super::*;
+
+#[test]
+fn errors_without_nats_url() {
+    unsafe { std::env::remove_var("NATS_URL"); }
+    assert!(NatsConfig::from_env().is_err());
+}
+
+#[test]
+fn defaults_with_only_url() {
+    unsafe {
+        std::env::set_var("NATS_URL", "nats://localhost:4222");
+        std::env::remove_var("NATS_MODE");
+        std::env::remove_var("NATS_SUBJECT_PREFIX");
+        std::env::remove_var("NATS_STREAM_NAME");
+        std::env::remove_var("NATS_CONSUMER_NAME");
+    }
+
+    let cfg = NatsConfig::from_env().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");
+
+    unsafe { std::env::remove_var("NATS_URL"); }
+}
+
+#[test]
+fn core_mode_parsed() {
+    unsafe {
+        std::env::set_var("NATS_URL", "nats://test:4222");
+        std::env::set_var("NATS_MODE", "core");
+    }
+
+    let cfg = NatsConfig::from_env().unwrap();
+    assert_eq!(cfg.mode, NatsMode::Core);
+
+    unsafe {
+        std::env::remove_var("NATS_URL");
+        std::env::remove_var("NATS_MODE");
+    }
+}
+
+#[test]
+fn invalid_mode_errors() {
+    unsafe {
+        std::env::set_var("NATS_URL", "nats://test:4222");
+        std::env::set_var("NATS_MODE", "kafka");
+    }
+
+    assert!(NatsConfig::from_env().is_err());
+
+    unsafe {
+        std::env::remove_var("NATS_URL");
+        std::env::remove_var("NATS_MODE");
+    }
+}