Implement code for recieving the answer to a query

tests/mod.rs

@@ -21,6 +21,8 @@ use eagle::Protocol;
 enum TestProtocol {
     Addition((i32, i32), i32),
     SomeKindOfQuestion(String, i32),
+    ThisRespondsWithAString(i32, String),
+    Void((), ()),
 }
 
 struct DummyServer;
@@ -32,6 +34,14 @@ impl TestProtocolServer for DummyServer {
     fn addition(&mut self, a: i32, b: i32) -> i32 {
         a + b
     }
+
+    fn this_responds_with_a_string(&mut self, arg: i32) -> String {
+        format!("The number is {}", arg)
+    }
+
+    fn void(&mut self) {
+        println!("Void function called!")
+    }
 }
 
 fn main() {}