fix tests

nomos-services/mix/tests/frequency.rs

@@ -113,9 +113,10 @@ fn new_mix_configs(listening_addresses: Vec<Multiaddr>) -> Vec<TestMixSettings>
         .iter()
         .map(|(backend, private_key)| Node {
             address: backend.listening_address.clone(),
-            // We use private key as a public key because the `MockMixMessage` doesn't differentiate between them.
-            // TODO: Convert private key to public key properly once the real MixMessage is implemented.
-            public_key: private_key.to_bytes(),
+            public_key: x25519_dalek::PublicKey::from(&x25519_dalek::StaticSecret::from(
+                private_key.to_bytes(),
+            ))
+            .to_bytes(),
         })
         .collect::<Vec<_>>();