Remove hardcoded digest from tests.

src/proto/server/credentials.rs

@@ -103,11 +103,11 @@ mod tests {
   fn into_login_request() {
     let user_name = "alice".to_string();
     let password = "sekrit".to_string();
-    let digest = "286da88eb442032bdd3913979af76e8a".to_string();
 
     let credentials =
       Credentials::new(user_name.clone(), password.clone()).unwrap();
 
+    let digest = credentials.digest().to_string();
     let version = Version {
       major: 13,
       minor: 37,