BevyRenet: fix sometimes failing to connect in test

Updating only 3 time to connect may fail since we don't control the system order for the server/client update.  Update a few more times to make sure the connection is established.

bevy_renet/Cargo.toml

@@ -18,3 +18,4 @@ renet = { path = "../renet", version = "0.0.9" }
 serde = { version = "1.0", features = [ "derive" ] } 
 bevy = { version = "0.8.0", default-features = false, features = ["bevy_core_pipeline", "bevy_render", "bevy_asset", "bevy_pbr", "x11"] }
 bincode = "1.3.1"
+env_logger = "0.9.0"

bevy_renet/src/lib.rs

@@ -146,6 +146,7 @@ mod tests {
 
     #[test]
     fn sending_and_receiving_messages() {
+        env_logger::init();
         let server = create_server().unwrap();
         let client = create_client().unwrap();
 
@@ -156,9 +157,10 @@ mod tests {
             .insert_resource(server)
             .insert_resource(client);
 
-        app.update();
-        app.update();
-        app.update();
+        // Connect client
+        for _ in 0..10 {
+            app.update();
+        }
 
         let client = app.world.resource::<RenetClient>();
         assert!(client.is_connected(), "The client should be connected to the server",);