diff --git a/sgl-router/Cargo.toml b/sgl-router/Cargo.toml
index b23b6d7ac..74b1ed129 100644
--- a/sgl-router/Cargo.toml
+++ b/sgl-router/Cargo.toml
@@ -42,6 +42,9 @@ url = "2.5.4"
 
 [dev-dependencies]
 criterion = { version = "0.5", features = ["html_reports"] }
+tokio-stream = "0.1"
+actix-http = "3.0"
+futures = "0.3"
 
 [[bench]]
 name = "request_processing"
diff --git a/sgl-router/tests/common/mock_worker.rs b/sgl-router/tests/common/mock_worker.rs
new file mode 100644
index 000000000..c5129febc
--- /dev/null
+++ b/sgl-router/tests/common/mock_worker.rs
@@ -0,0 +1,650 @@
+use actix_web::{middleware, web, App, HttpRequest, HttpResponse, HttpServer};
+use futures_util::StreamExt;
+use serde_json::json;
+use std::sync::Arc;
+use std::time::{SystemTime, UNIX_EPOCH};
+use tokio::sync::RwLock;
+use uuid;
+
+/// Configuration for mock worker behavior
+#[derive(Clone)]
+pub struct MockWorkerConfig {
+    pub port: u16,
+    pub worker_type: WorkerType,
+    pub health_status: HealthStatus,
+    pub response_delay_ms: u64,
+    pub fail_rate: f32,
+}
+
+#[derive(Clone, Debug)]
+pub enum WorkerType {
+    Regular,
+    Prefill,
+    Decode,
+}
+
+#[derive(Clone, Debug)]
+pub enum HealthStatus {
+    Healthy,
+    Unhealthy,
+    Degraded,
+}
+
+/// Mock worker server for testing
+pub struct MockWorker {
+    config: Arc<RwLock<MockWorkerConfig>>,
+    server_handle: Option<actix_web::dev::ServerHandle>,
+}
+
+impl MockWorker {
+    pub fn new(config: MockWorkerConfig) -> Self {
+        Self {
+            config: Arc::new(RwLock::new(config)),
+            server_handle: None,
+        }
+    }
+
+    /// Start the mock worker server
+    pub async fn start(&mut self) -> Result<String, Box<dyn std::error::Error>> {
+        let config = self.config.clone();
+        let port = config.read().await.port;
+
+        let server = HttpServer::new(move || {
+            App::new()
+                .app_data(web::Data::new(config.clone()))
+                .wrap(middleware::Logger::default())
+                .route("/health", web::get().to(health_handler))
+                .route("/health_generate", web::get().to(health_generate_handler))
+                .route("/get_server_info", web::get().to(server_info_handler))
+                .route("/get_model_info", web::get().to(model_info_handler))
+                .route("/generate", web::post().to(generate_handler))
+                .route(
+                    "/v1/chat/completions",
+                    web::post().to(chat_completions_handler),
+                )
+                .route("/v1/completions", web::post().to(completions_handler))
+                .route("/flush_cache", web::post().to(flush_cache_handler))
+                .route("/v1/models", web::get().to(v1_models_handler))
+        })
+        .bind(("127.0.0.1", port))?
+        .run();
+
+        let handle = server.handle();
+        self.server_handle = Some(handle);
+
+        tokio::spawn(server);
+
+        Ok(format!("http://127.0.0.1:{}", port))
+    }
+
+    /// Stop the mock worker server
+    pub async fn stop(&mut self) {
+        if let Some(handle) = self.server_handle.take() {
+            // First try graceful stop with short timeout
+            handle.stop(false);
+            // Give it a moment to stop gracefully
+            tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;
+        }
+    }
+
+    /// Update the mock worker configuration
+    pub async fn update_config<F>(&self, updater: F)
+    where
+        F: FnOnce(&mut MockWorkerConfig),
+    {
+        let mut config = self.config.write().await;
+        updater(&mut *config);
+    }
+}
+
+// Handler implementations
+
+async fn health_handler(config: web::Data<Arc<RwLock<MockWorkerConfig>>>) -> HttpResponse {
+    let config = config.read().await;
+
+    match config.health_status {
+        HealthStatus::Healthy => HttpResponse::Ok().json(json!({
+            "status": "healthy",
+            "timestamp": SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(),
+            "worker_type": format!("{:?}", config.worker_type),
+        })),
+        HealthStatus::Unhealthy => HttpResponse::ServiceUnavailable().json(json!({
+            "status": "unhealthy",
+            "error": "Worker is not responding"
+        })),
+        HealthStatus::Degraded => HttpResponse::Ok().json(json!({
+            "status": "degraded",
+            "warning": "High load detected"
+        })),
+    }
+}
+
+async fn health_generate_handler(config: web::Data<Arc<RwLock<MockWorkerConfig>>>) -> HttpResponse {
+    let config = config.read().await;
+
+    if matches!(config.health_status, HealthStatus::Healthy) {
+        HttpResponse::Ok().json(json!({
+            "status": "ok",
+            "queue_length": 0,
+            "processing_time_ms": config.response_delay_ms
+        }))
+    } else {
+        HttpResponse::ServiceUnavailable().json(json!({
+            "error": "Generation service unavailable"
+        }))
+    }
+}
+
+async fn server_info_handler(config: web::Data<Arc<RwLock<MockWorkerConfig>>>) -> HttpResponse {
+    let config = config.read().await;
+
+    // Return response matching actual sglang server implementation
+    HttpResponse::Ok().json(json!({
+        // Server args fields
+        "model_path": "mock-model-path",
+        "tokenizer_path": "mock-tokenizer-path",
+        "port": config.port,
+        "host": "127.0.0.1",
+        "max_num_batched_tokens": 32768,
+        "max_prefill_tokens": 16384,
+        "mem_fraction_static": 0.88,
+        "tp_size": 1,
+        "dp_size": 1,
+        "stream_interval": 8,
+        "dtype": "float16",
+        "device": "cuda",
+        "enable_flashinfer": true,
+        "enable_p2p_check": true,
+        "context_length": 32768,
+        "chat_template": null,
+        "disable_radix_cache": false,
+        "enable_torch_compile": false,
+        "trust_remote_code": false,
+        "show_time_cost": false,
+
+        // Scheduler info fields
+        "waiting_queue_size": 0,
+        "running_queue_size": 0,
+        "req_to_token_ratio": 1.2,
+        "min_running_requests": 0,
+        "max_running_requests": 2048,
+        "max_req_num": 8192,
+        "max_batch_tokens": 32768,
+        "schedule_policy": "lpm",
+        "schedule_conservativeness": 1.0,
+
+        // Additional fields
+        "version": "0.3.0",
+        "internal_states": [{
+            "waiting_queue_size": 0,
+            "running_queue_size": 0
+        }]
+    }))
+}
+
+async fn model_info_handler(_config: web::Data<Arc<RwLock<MockWorkerConfig>>>) -> HttpResponse {
+    // Return response matching actual sglang server implementation
+    HttpResponse::Ok().json(json!({
+        "model_path": "mock-model-path",
+        "tokenizer_path": "mock-tokenizer-path",
+        "is_generation": true,
+        "preferred_sampling_params": {
+            "temperature": 0.7,
+            "top_p": 0.9,
+            "top_k": 40,
+            "max_tokens": 2048
+        }
+    }))
+}
+
+async fn generate_handler(
+    config: web::Data<Arc<RwLock<MockWorkerConfig>>>,
+    _req: HttpRequest,
+    payload: web::Json<serde_json::Value>,
+) -> HttpResponse {
+    let config = config.read().await;
+
+    // Simulate failure based on fail_rate
+    if rand::random::<f32>() < config.fail_rate {
+        return HttpResponse::InternalServerError().json(json!({
+            "error": "Random failure for testing"
+        }));
+    }
+
+    // Simulate processing delay
+    if config.response_delay_ms > 0 {
+        tokio::time::sleep(tokio::time::Duration::from_millis(config.response_delay_ms)).await;
+    }
+
+    let is_stream = payload
+        .get("stream")
+        .and_then(|v| v.as_bool())
+        .unwrap_or(false);
+
+    if is_stream {
+        // Return streaming response matching sglang format
+        let (tx, rx) = tokio::sync::mpsc::channel(10);
+        let stream_delay = config.response_delay_ms;
+        let request_id = format!("mock-req-{}", rand::random::<u32>());
+
+        tokio::spawn(async move {
+            let tokens = vec!["This ", "is ", "a ", "mock ", "response."];
+            let timestamp_start = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs_f64();
+
+            for (i, token) in tokens.iter().enumerate() {
+                let chunk = json!({
+                    "text": token,
+                    "meta_info": {
+                        "id": &request_id,
+                        "finish_reason": if i == tokens.len() - 1 {
+                            json!({"type": "stop", "matched_stop": null})
+                        } else {
+                            json!(null)
+                        },
+                        "prompt_tokens": 10,
+                        "completion_tokens": i + 1,
+                        "cached_tokens": 0,
+                        "e2e_latency": SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs_f64() - timestamp_start
+                    }
+                });
+
+                if tx.send(format!("data: {}\n\n", serde_json::to_string(&chunk).unwrap())).await.is_err() {
+                    break;
+                }
+
+                if stream_delay > 0 {
+                    tokio::time::sleep(tokio::time::Duration::from_millis(stream_delay)).await;
+                }
+            }
+
+            let _ = tx.send("data: [DONE]\n\n".to_string()).await;
+        });
+
+        let stream = tokio_stream::wrappers::ReceiverStream::new(rx);
+
+        HttpResponse::Ok()
+            .content_type("text/event-stream")
+            .insert_header(("Cache-Control", "no-cache"))
+            .streaming(stream.map(|chunk| Ok::<_, actix_web::Error>(bytes::Bytes::from(chunk))))
+    } else {
+        // Return non-streaming response matching sglang format
+        let request_id = format!("mock-req-{}", rand::random::<u32>());
+        let timestamp_start = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs_f64();
+
+        HttpResponse::Ok().json(json!({
+            "text": "Mock generated response for the input",
+            "meta_info": {
+                "id": request_id,
+                "finish_reason": {
+                    "type": "stop",
+                    "matched_stop": null
+                },
+                "prompt_tokens": 10,
+                "completion_tokens": 7,
+                "cached_tokens": 0,
+                "e2e_latency": 0.042
+            }
+        }))
+    }
+}
+
+async fn chat_completions_handler(
+    config: web::Data<Arc<RwLock<MockWorkerConfig>>>,
+    payload: web::Json<serde_json::Value>,
+) -> HttpResponse {
+    let config = config.read().await;
+
+    // Simulate failure
+    if rand::random::<f32>() < config.fail_rate {
+        return HttpResponse::InternalServerError().json(json!({
+            "error": "Chat completion failed"
+        }));
+    }
+
+    let is_stream = payload
+        .get("stream")
+        .and_then(|v| v.as_bool())
+        .unwrap_or(false);
+
+    if is_stream {
+        // Return proper streaming response for chat completions
+        let (tx, rx) = tokio::sync::mpsc::channel(10);
+        let stream_delay = config.response_delay_ms;
+        let model = payload
+            .get("model")
+            .and_then(|m| m.as_str())
+            .unwrap_or("mock-model")
+            .to_string();
+
+        tokio::spawn(async move {
+            let chat_id = format!("chatcmpl-mock{}", rand::random::<u32>());
+            let timestamp = SystemTime::now()
+                .duration_since(UNIX_EPOCH)
+                .unwrap()
+                .as_secs();
+
+            // Send initial chunk with role
+            let initial_chunk = json!({
+                "id": &chat_id,
+                "object": "chat.completion.chunk",
+                "created": timestamp,
+                "model": &model,
+                "choices": [{
+                    "index": 0,
+                    "delta": {
+                        "role": "assistant"
+                    },
+                    "finish_reason": null
+                }]
+            });
+
+            let _ = tx
+                .send(format!(
+                    "data: {}\n\n",
+                    serde_json::to_string(&initial_chunk).unwrap()
+                ))
+                .await;
+
+            // Send content chunks
+            let content_chunks = [
+                "This ",
+                "is ",
+                "a ",
+                "mock ",
+                "streaming ",
+                "chat ",
+                "response.",
+            ];
+            for chunk in content_chunks.iter() {
+                let data = json!({
+                    "id": &chat_id,
+                    "object": "chat.completion.chunk",
+                    "created": timestamp,
+                    "model": &model,
+                    "choices": [{
+                        "index": 0,
+                        "delta": {
+                            "content": chunk
+                        },
+                        "finish_reason": null
+                    }]
+                });
+
+                if tx
+                    .send(format!(
+                        "data: {}\n\n",
+                        serde_json::to_string(&data).unwrap()
+                    ))
+                    .await
+                    .is_err()
+                {
+                    break;
+                }
+
+                if stream_delay > 0 {
+                    tokio::time::sleep(tokio::time::Duration::from_millis(stream_delay)).await;
+                }
+            }
+
+            // Send final chunk with finish_reason
+            let final_chunk = json!({
+                "id": &chat_id,
+                "object": "chat.completion.chunk",
+                "created": timestamp,
+                "model": &model,
+                "choices": [{
+                    "index": 0,
+                    "delta": {},
+                    "finish_reason": "stop"
+                }]
+            });
+
+            let _ = tx
+                .send(format!(
+                    "data: {}\n\n",
+                    serde_json::to_string(&final_chunk).unwrap()
+                ))
+                .await;
+            let _ = tx.send("data: [DONE]\n\n".to_string()).await;
+        });
+
+        let stream = tokio_stream::wrappers::ReceiverStream::new(rx);
+
+        HttpResponse::Ok()
+            .content_type("text/event-stream")
+            .insert_header(("Cache-Control", "no-cache"))
+            .streaming(stream.map(|chunk| Ok::<_, actix_web::Error>(bytes::Bytes::from(chunk))))
+    } else {
+        // Non-streaming response matching OpenAI format
+        let model = payload
+            .get("model")
+            .and_then(|m| m.as_str())
+            .unwrap_or("mock-model")
+            .to_string();
+
+        HttpResponse::Ok().json(json!({
+            "id": format!("chatcmpl-{}", uuid::Uuid::new_v4()),
+            "object": "chat.completion",
+            "created": SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(),
+            "model": model,
+            "choices": [{
+                "index": 0,
+                "message": {
+                    "role": "assistant",
+                    "content": "This is a mock chat completion response."
+                },
+                "logprobs": null,
+                "finish_reason": "stop",
+                "matched_stop": null
+            }],
+            "usage": {
+                "prompt_tokens": 10,
+                "completion_tokens": 8,
+                "total_tokens": 18,
+                "prompt_tokens_details": {
+                    "cached_tokens": 0
+                }
+            }
+        }))
+    }
+}
+
+async fn completions_handler(
+    config: web::Data<Arc<RwLock<MockWorkerConfig>>>,
+    payload: web::Json<serde_json::Value>,
+) -> HttpResponse {
+    let config = config.read().await;
+
+    if rand::random::<f32>() < config.fail_rate {
+        return HttpResponse::InternalServerError().json(json!({
+            "error": "Completion failed"
+        }));
+    }
+
+    // Check if streaming is requested
+    let is_stream = payload
+        .get("stream")
+        .and_then(|v| v.as_bool())
+        .unwrap_or(false);
+
+    let prompts = payload
+        .get("prompt")
+        .map(|p| {
+            if p.is_array() {
+                p.as_array().unwrap().len()
+            } else {
+                1
+            }
+        })
+        .unwrap_or(1);
+
+    if is_stream {
+        // Return streaming response for completions
+        let (tx, rx) = tokio::sync::mpsc::channel(10);
+        let stream_delay = config.response_delay_ms;
+        let model = payload
+            .get("model")
+            .and_then(|m| m.as_str())
+            .unwrap_or("mock-model")
+            .to_string();
+
+        tokio::spawn(async move {
+            let completion_id = format!("cmpl-mock{}", rand::random::<u32>());
+            let timestamp = SystemTime::now()
+                .duration_since(UNIX_EPOCH)
+                .unwrap()
+                .as_secs();
+
+            // Stream completions for each prompt
+            for prompt_idx in 0..prompts {
+                let prompt_suffix = format!("{} ", prompt_idx);
+                let tokens = vec!["This ", "is ", "mock ", "completion ", &prompt_suffix];
+
+                for (token_idx, token) in tokens.iter().enumerate() {
+                    let data = json!({
+                        "id": &completion_id,
+                        "object": "text_completion",
+                        "created": timestamp,
+                        "model": &model,
+                        "choices": [{
+                            "text": token,
+                            "index": prompt_idx,
+                            "logprobs": null,
+                            "finish_reason": if token_idx == tokens.len() - 1 { Some("stop") } else { None }
+                        }]
+                    });
+
+                    if tx
+                        .send(format!(
+                            "data: {}\n\n",
+                            serde_json::to_string(&data).unwrap()
+                        ))
+                        .await
+                        .is_err()
+                    {
+                        return;
+                    }
+
+                    if stream_delay > 0 {
+                        tokio::time::sleep(tokio::time::Duration::from_millis(stream_delay)).await;
+                    }
+                }
+            }
+
+            let _ = tx.send("data: [DONE]\n\n".to_string()).await;
+        });
+
+        let stream = tokio_stream::wrappers::ReceiverStream::new(rx);
+
+        HttpResponse::Ok()
+            .content_type("text/event-stream")
+            .insert_header(("Cache-Control", "no-cache"))
+            .streaming(stream.map(|chunk| Ok::<_, actix_web::Error>(bytes::Bytes::from(chunk))))
+    } else {
+        // Return non-streaming response
+        let mut choices = vec![];
+        for i in 0..prompts {
+            choices.push(json!({
+                "text": format!("Mock completion {}", i),
+                "index": i,
+                "logprobs": null,
+                "finish_reason": "stop"
+            }));
+        }
+
+        HttpResponse::Ok().json(json!({
+            "id": format!("cmpl-mock{}", rand::random::<u32>()),
+            "object": "text_completion",
+            "created": SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(),
+            "model": payload.get("model").and_then(|m| m.as_str()).unwrap_or("mock-model"),
+            "choices": choices,
+            "usage": {
+                "prompt_tokens": 5 * prompts,
+                "completion_tokens": 10 * prompts,
+                "total_tokens": 15 * prompts
+            }
+        }))
+    }
+}
+
+async fn flush_cache_handler(_config: web::Data<Arc<RwLock<MockWorkerConfig>>>) -> HttpResponse {
+    HttpResponse::Ok().json(json!({
+        "status": "success",
+        "message": "Cache flushed",
+        "freed_entries": 42
+    }))
+}
+
+async fn v1_models_handler(_config: web::Data<Arc<RwLock<MockWorkerConfig>>>) -> HttpResponse {
+    HttpResponse::Ok().json(json!({
+        "object": "list",
+        "data": [{
+            "id": "mock-model-v1",
+            "object": "model",
+            "created": SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(),
+            "owned_by": "sglang",
+            "permission": [{
+                "id": "modelperm-mock",
+                "object": "model_permission",
+                "created": SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs(),
+                "allow_create_engine": false,
+                "allow_sampling": true,
+                "allow_logprobs": true,
+                "allow_search_indices": false,
+                "allow_view": true,
+                "allow_fine_tuning": false,
+                "organization": "*",
+                "group": null,
+                "is_blocking": false
+            }],
+            "root": "mock-model-v1",
+            "parent": null
+        }]
+    }))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[tokio::test]
+    async fn test_mock_worker_lifecycle() {
+        let config = MockWorkerConfig {
+            port: 18080,
+            worker_type: WorkerType::Regular,
+            health_status: HealthStatus::Healthy,
+            response_delay_ms: 0,
+            fail_rate: 0.0,
+        };
+
+        let mut worker = MockWorker::new(config);
+
+        // Start the worker
+        let url = worker.start().await.unwrap();
+        assert_eq!(url, "http://127.0.0.1:18080");
+
+        // Give server time to start
+        tokio::time::sleep(tokio::time::Duration::from_millis(100)).await;
+
+        // Test health endpoint
+        let client = reqwest::Client::new();
+        let resp = client.get(&format!("{}/health", url)).send().await.unwrap();
+
+        assert_eq!(resp.status(), 200);
+        let body: serde_json::Value = resp.json().await.unwrap();
+        assert_eq!(body["status"], "healthy");
+
+        // Update config to unhealthy
+        worker
+            .update_config(|c| c.health_status = HealthStatus::Unhealthy)
+            .await;
+
+        // Test health again
+        let resp = client.get(&format!("{}/health", url)).send().await.unwrap();
+
+        assert_eq!(resp.status(), 503);
+
+        // Stop the worker
+        worker.stop().await;
+    }
+}
diff --git a/sgl-router/tests/common/mod.rs b/sgl-router/tests/common/mod.rs
new file mode 100644
index 000000000..34467cd08
--- /dev/null
+++ b/sgl-router/tests/common/mod.rs
@@ -0,0 +1,56 @@
+pub mod mock_worker;
+
+use actix_web::web;
+use reqwest::Client;
+use sglang_router_rs::config::{PolicyConfig, RouterConfig, RoutingMode};
+use sglang_router_rs::server::AppState;
+
+/// Helper function to create test router configuration
+pub fn create_test_config(worker_urls: Vec<String>) -> RouterConfig {
+    RouterConfig {
+        mode: RoutingMode::Regular { worker_urls },
+        policy: PolicyConfig::Random,
+        host: "127.0.0.1".to_string(),
+        port: 3001,
+        max_payload_size: 256 * 1024 * 1024, // 256MB
+        request_timeout_secs: 600,
+        worker_startup_timeout_secs: 300,
+        worker_startup_check_interval_secs: 10,
+        discovery: None,
+        metrics: None,
+        log_dir: None,
+        log_level: None,
+    }
+}
+
+/// Helper function to create test router configuration with no health check
+pub fn create_test_config_no_workers() -> RouterConfig {
+    RouterConfig {
+        mode: RoutingMode::Regular {
+            worker_urls: vec![],
+        }, // Empty to skip health check
+        policy: PolicyConfig::Random,
+        host: "127.0.0.1".to_string(),
+        port: 3001,
+        max_payload_size: 256 * 1024 * 1024, // 256MB
+        request_timeout_secs: 600,
+        worker_startup_timeout_secs: 0, // No wait
+        worker_startup_check_interval_secs: 10,
+        discovery: None,
+        metrics: None,
+        log_dir: None,
+        log_level: None,
+    }
+}
+
+/// Helper function to create test app state
+pub async fn create_test_app_state(config: RouterConfig) -> Result<web::Data<AppState>, String> {
+    // Create a non-blocking client
+    let client = Client::builder()
+        .timeout(std::time::Duration::from_secs(config.request_timeout_secs))
+        .build()
+        .map_err(|e| e.to_string())?;
+
+    let app_state = AppState::new(config, client)?;
+    Ok(web::Data::new(app_state))
+}