code refactor

Reviewed-on: #26

crates/adapters/nats/tests/nats_config_test.rs

@@ -0,0 +1,70 @@
+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(),
+            &config::EventsConfig::default()
+        )
+        .is_err()
+    );
+}
+
+#[test]
+fn defaults_with_only_url() {
+    let cfg = NatsConfig::from_config(
+        &config::NatsConfig {
+            url: Some("nats://localhost:4222".into()),
+            ..Default::default()
+        },
+        &config::EventsConfig::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"),
+        &config::EventsConfig::default(),
+    )
+    .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"),
+            &config::EventsConfig::default()
+        )
+        .is_err()
+    );
+}
+
+#[test]
+fn max_deliver_follows_the_queue_attempt_limit() {
+    let events = config::EventsConfig {
+        queue_max_attempts: 9,
+        ..Default::default()
+    };
+    let cfg =
+        NatsConfig::from_config(&section(Some("nats://test:4222"), "jetstream"), &events).unwrap();
+    assert_eq!(cfg.max_deliver, 9);
+}