add test coverage for separate clippy prefixes

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/src/core/config/tests.rs

@@ -323,6 +323,23 @@ fn order_of_clippy_rules() {
 assert_eq!(expected, actual);
 }
 
+#[test]
+fnclippy_rule_separate_prefix(){
+let args =
+vec!["clippy".to_string(),"-A clippy:all".to_string(),"-W clippy::style".to_string()];
+let config = Config::parse(Flags::parse(&args));
+
+let actual = match&config.cmd{
+crate::Subcommand::Clippy{ allow, deny, warn, forbid, .. } => {
+get_clippy_rules_in_order(&args,&allow,&deny,&warn,&forbid)
+}
+ _ => panic!("invalid subcommand"),
+};
+
+let expected = vec!["-A clippy:all".to_string(),"-W clippy::style".to_string()];
+assert_eq!(expected, actual);
+}
+
 #[test]
 fnverbose_tests_default_value(){
 let config = Config::parse(Flags::parse(&["build".into(),"compiler".into()]));