diff --git a/Cargo.toml b/Cargo.toml
index b994a6b..a848e05 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,4 +8,5 @@ members = [
   # Internal
   "code-generator",
   "examples",
+  "e2e-test"
 ]
diff --git a/e2e-test/Cargo.toml b/e2e-test/Cargo.toml
new file mode 100644
index 0000000..9a4b941
--- /dev/null
+++ b/e2e-test/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "e2e-test"
+version = "0.1.0"
+edition = "2018"
+license-file = "../LICENSE"
+publish = false
+
+[dependencies]
+radius = { version = "0.1.0", path = "../radius" }
+radius-client = { version = "0.1.0", path = "../radius-client" }
+radius-server = { version = "0.1.0", path = "../radius-server" }
+tokio = { version = "0.3.4", features = ["signal", "net"] }
+async-trait = "0.1.42"
diff --git a/e2e-test/src/lib.rs b/e2e-test/src/lib.rs
new file mode 100644
index 0000000..5857229
--- /dev/null
+++ b/e2e-test/src/lib.rs
@@ -0,0 +1 @@
+mod test;
diff --git a/e2e-test/src/test.rs b/e2e-test/src/test.rs
new file mode 100644
index 0000000..fdef84d
--- /dev/null
+++ b/e2e-test/src/test.rs
@@ -0,0 +1,166 @@
+use std::io;
+use std::net::SocketAddr;
+use std::time::Duration;
+
+use async_trait::async_trait;
+use tokio::net::UdpSocket;
+use tokio::time::sleep;
+
+use radius::code::Code;
+use radius::request::Request;
+use radius::rfc2865;
+use radius_server::request_handler::RequestHandler;
+use radius_server::secret_provider::{SecretProvider, SecretProviderError};
+
+struct MyRequestHandler {}
+
+#[async_trait]
+impl RequestHandler<(), io::Error> for MyRequestHandler {
+    async fn handle_radius_request(
+        &self,
+        conn: &UdpSocket,
+        req: &Request,
+    ) -> Result<(), io::Error> {
+        let req_packet = req.get_packet();
+        let maybe_user_name_attr = rfc2865::lookup_user_name(req_packet);
+        let maybe_user_password_attr = rfc2865::lookup_user_password(req_packet);
+
+        let user_name = maybe_user_name_attr.unwrap().unwrap();
+        let user_password = String::from_utf8(maybe_user_password_attr.unwrap().unwrap()).unwrap();
+        let code = if user_name == "admin" && user_password == "p@ssw0rd" {
+            Code::AccessAccept
+        } else {
+            Code::AccessReject
+        };
+
+        let mut resp_packet = req_packet.make_response_packet(code);
+        rfc2865::add_user_name(&mut resp_packet, user_name.as_str());
+        conn.send_to(&resp_packet.encode().unwrap(), req.get_remote_addr())
+            .await?;
+        Ok(())
+    }
+}
+
+struct LongTimeTakingHandler {}
+
+#[async_trait]
+impl RequestHandler<(), io::Error> for LongTimeTakingHandler {
+    async fn handle_radius_request(
+        &self,
+        conn: &UdpSocket,
+        req: &Request,
+    ) -> Result<(), io::Error> {
+        sleep(Duration::from_secs(30)).await;
+        let req_packet = req.get_packet();
+        let resp_packet = req_packet.make_response_packet(Code::AccessReject);
+        conn.send_to(&resp_packet.encode().unwrap(), req.get_remote_addr())
+            .await?;
+        Ok(())
+    }
+}
+
+struct MySecretProvider {}
+
+impl SecretProvider for MySecretProvider {
+    fn fetch_secret(&self, _remote_addr: SocketAddr) -> Result<Vec<u8>, SecretProviderError> {
+        let bs = b"secret".to_vec();
+        Ok(bs)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use std::net::SocketAddr;
+    use std::time::Duration;
+
+    use tokio::sync::oneshot;
+
+    use radius::code::Code;
+    use radius::packet::Packet;
+    use radius::rfc2865;
+    use radius_client::client::{Client, ClientError};
+    use radius_server::server::Server;
+
+    use crate::test::{LongTimeTakingHandler, MyRequestHandler, MySecretProvider};
+
+    #[tokio::test]
+    async fn test_runner() {
+        test_access_request().await;
+        test_socket_timeout().await;
+    }
+
+    async fn test_access_request() {
+        let (sender, receiver) = oneshot::channel::<()>();
+
+        let port = 1812;
+
+        let server_proc = tokio::spawn(async move {
+            Server::run(
+                "0.0.0.0",
+                port,
+                1500,
+                true,
+                MyRequestHandler {},
+                MySecretProvider {},
+                receiver,
+            )
+            .await
+            .unwrap();
+        });
+
+        let remote_addr: SocketAddr = format!("127.0.0.1:{}", port).parse().unwrap();
+        let client = Client::new(None, None);
+
+        let mut req_packet = Packet::new(Code::AccessRequest, &b"secret".to_vec());
+        rfc2865::add_user_name(&mut req_packet, "admin");
+        rfc2865::add_user_password(&mut req_packet, b"p@ssw0rd").unwrap();
+        let res = client.send_packet(&remote_addr, &req_packet).await.unwrap();
+        let maybe_user_name = rfc2865::lookup_user_name(&res);
+        let maybe_user_pass = rfc2865::lookup_user_password(&res);
+        assert_eq!(res.get_code(), Code::AccessAccept);
+        assert_eq!(maybe_user_name.is_some(), true);
+        assert_eq!(maybe_user_name.unwrap().unwrap(), "admin");
+        assert_eq!(maybe_user_pass.is_none(), true);
+
+        let mut req_packet = Packet::new(Code::AccessRequest, &b"secret".to_vec());
+        rfc2865::add_user_name(&mut req_packet, "admin");
+        rfc2865::add_user_password(&mut req_packet, b"INVALID-PASS").unwrap();
+        let res = client.send_packet(&remote_addr, &req_packet).await.unwrap();
+        assert_eq!(res.get_code(), Code::AccessReject);
+
+        sender.send(()).unwrap();
+        server_proc.await.unwrap();
+    }
+
+    async fn test_socket_timeout() {
+        let (sender, receiver) = oneshot::channel::<()>();
+
+        let port = 1812;
+
+        let server_proc = tokio::spawn(async move {
+            Server::run(
+                "0.0.0.0",
+                port,
+                1500,
+                true,
+                LongTimeTakingHandler {},
+                MySecretProvider {},
+                receiver,
+            )
+            .await
+            .unwrap();
+        });
+
+        let remote_addr: SocketAddr = format!("127.0.0.1:{}", port).parse().unwrap();
+        let client = Client::new(None, Some(Duration::from_secs(0)));
+
+        let mut req_packet = Packet::new(Code::AccessRequest, &b"secret".to_vec());
+        rfc2865::add_user_name(&mut req_packet, "admin");
+        rfc2865::add_user_password(&mut req_packet, b"p@ssw0rd").unwrap();
+        let res = client.send_packet(&remote_addr, &req_packet).await;
+        assert_eq!(res.unwrap_err(), ClientError::SocketTimeoutError());
+
+        sender.send(()).unwrap();
+        server_proc.await.unwrap();
+    }
+}
diff --git a/radius-client/src/client.rs b/radius-client/src/client.rs
index 12d4ed1..995d32a 100644
--- a/radius-client/src/client.rs
+++ b/radius-client/src/client.rs
@@ -12,7 +12,7 @@ use crate::client::ClientError::{
     FailedReceivingResponse, FailedSendingPacket, FailedUdpSocketBinding,
 };
 
-#[derive(Error, Debug)]
+#[derive(Error, PartialEq, Debug)]
 pub enum ClientError {
     #[error("failed to bind a UDP socket => `{0}`")]
     FailedUdpSocketBinding(String),