fix(test): test case compile error

Author: handewo

russh/examples/echoserver_certificates.rs

@@ -109,6 +109,7 @@ impl server::Server for Server {
 
 impl server::Handler for Server {
     type Error = russh::Error;
+    type Data = ();
 
     async fn channel_open_session(
         &mut self,

russh/src/server/encrypted.rs

@@ -225,6 +225,7 @@ mod tests {
 
         impl Handler for Probe {
             type Error = Error;
+            type Data = ();
 
             async fn auth_publickey_offered(
                 &mut self,
@@ -426,6 +427,7 @@ mod tests {
 
         impl Handler for Probe {
             type Error = Error;
+            type Data = ();
 
             async fn auth_publickey_offered(
                 &mut self,
@@ -526,6 +528,7 @@ mod tests {
 
     impl Handler for ChannelCallbackProbe {
         type Error = Error;
+        type Data = ();
 
         async fn exec_request(
             &mut self,

russh/tests/test_backpressure.rs

@@ -243,6 +243,7 @@ impl russh::server::Server for HandleBackpressureServer {
 
 impl russh::server::Handler for HandleBackpressureServer {
     type Error = anyhow::Error;
+    type Data = ();
 
     async fn auth_publickey(
         &mut self,

russh/tests/test_contention.rs

@@ -125,6 +125,7 @@ impl russh::server::Server for Server {
 
 impl russh::server::Handler for Server {
     type Error = anyhow::Error;
+    type Data = ();
 
     async fn auth_publickey(
         &mut self,

russh/tests/test_server_cert.rs

@@ -222,6 +222,7 @@ struct TestServer {}
 
 impl server::Handler for TestServer {
     type Error = russh::Error;
+    type Data = ();
 
     async fn auth_publickey(
         &mut self,