diff --git a/tests/http_health.rs b/tests/http_health.rs
new file mode 100644
index 0000000..516a849
--- /dev/null
+++ b/tests/http_health.rs
@@ -0,0 +1,22 @@
+use std::time::Duration;
+
+#[tokio::test]
+async fn http_health_endpoint_should_return_healthy() {
+    let client = reqwest::Client::builder()
+        .timeout(Duration::from_secs(5))
+        .build()
+        .expect("cannot build client");
+
+    let url = std::env::var("SDK_RELAY_HTTP").unwrap_or_else(|_| "http://localhost:8091".to_string());
+    let res = client
+        .get(format!("{}/health", url))
+        .send()
+        .await
+        .expect("cannot call /health");
+
+    assert!(res.status().is_success(), "status: {}", res.status());
+
+    let json: serde_json::Value = res.json().await.expect("invalid json");
+    let status = json.get("status").and_then(|v| v.as_str()).unwrap_or("");
+    assert_eq!(status, "healthy", "health status should be healthy, got: {}", status);
+}
diff --git a/tests/http_metrics.rs b/tests/http_metrics.rs
new file mode 100644
index 0000000..72cb814
--- /dev/null
+++ b/tests/http_metrics.rs
@@ -0,0 +1,23 @@
+use std::time::Duration;
+
+#[tokio::test]
+async fn http_metrics_endpoint_should_return_expected_fields() {
+    let client = reqwest::Client::builder()
+        .timeout(Duration::from_secs(5))
+        .build()
+        .expect("cannot build client");
+
+    let url = std::env::var("SDK_RELAY_HTTP").unwrap_or_else(|_| "http://localhost:8091".to_string());
+    let res = client
+        .get(format!("{}/metrics", url))
+        .send()
+        .await
+        .expect("cannot call /metrics");
+
+    assert!(res.status().is_success(), "status: {}", res.status());
+
+    let json: serde_json::Value = res.json().await.expect("invalid json");
+
+    assert!(json.get("sync_metrics").is_some(), "missing sync_metrics");
+    assert!(json.get("system_metrics").is_some(), "missing system_metrics");
+}
diff --git a/tests/ws_handshake.rs b/tests/ws_handshake.rs
new file mode 100644
index 0000000..a742cae
--- /dev/null
+++ b/tests/ws_handshake.rs
@@ -0,0 +1,30 @@
+use futures_util::{SinkExt, StreamExt};
+use serde_json::json;
+use tokio_tungstenite::connect_async;
+
+#[tokio::test]
+async fn websocket_handshake_should_be_accepted() {
+    let url = std::env::var("SDK_RELAY_WS").unwrap_or_else(|_| "ws://localhost:8090".to_string());
+
+    let (mut ws, _resp) = connect_async(url).await.expect("cannot connect ws");
+
+    let handshake = json!({
+        "type": "handshake",
+        "client_id": "test-client",
+        "version": "1.0.0",
+        "capabilities": ["sync", "notifications", "health"],
+        "timestamp": 1703001600u64
+    })
+    .to_string();
+
+    ws.send(tokio_tungstenite::tungstenite::Message::Text(handshake))
+        .await
+        .expect("cannot send handshake");
+
+    let msg = ws.next().await.expect("no response").expect("ws error");
+    let txt = msg.into_text().expect("not text");
+    let json: serde_json::Value = serde_json::from_str(&txt).expect("invalid json");
+
+    assert_eq!(json.get("type").and_then(|v| v.as_str()).unwrap_or(""), "handshake_response");
+    assert_eq!(json.get("status").and_then(|v| v.as_str()).unwrap_or(""), "accepted");
+}