Automatically group imports using nightly rustfmt

src/config.rs

@@ -440,16 +440,15 @@ fn get_config_keys_string() -> String {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
-
     use std::str::FromStr;
     use std::string::ToString;
 
+    use num_traits::FromPrimitive;
+
+    use super::*;
     use crate::constants;
     use crate::test_utils::TestContext;
 
-    use num_traits::FromPrimitive;
-
     #[test]
     fn test_to_string() {
         assert_eq!(Config::MailServer.to_string(), "mail_server");