Add complex tests for assist generate_fn_type_alias

Author: A4-Tacks

crates/ide-assists/src/handlers/generate_fn_type_alias.rs

@@ -269,6 +269,22 @@ fn foo<A: Trait, B: Trait>(a: A, b: B) -> i32 { return 42; }
         );
     }
 
+    #[test]
+    fn generate_fn_alias_unnamed_complex_types() {
+        check_assist_by_label(
+            generate_fn_type_alias,
+            r#"
+fn fo$0o(x: Vec<i32>) {}
+"#,
+            r#"
+type ${0:FooFn} = fn(Vec<i32>);
+
+fn foo(x: Vec<i32>) {}
+"#,
+            ParamStyle::Unnamed.label(),
+        );
+    }
+
     #[test]
     fn generate_fn_alias_unnamed_self() {
         check_assist_by_label(
@@ -405,6 +421,22 @@ fn foo<A: Trait, B: Trait>(a: A, b: B) -> i32 { return 42; }
         );
     }
 
+    #[test]
+    fn generate_fn_alias_named_complex_types() {
+        check_assist_by_label(
+            generate_fn_type_alias,
+            r#"
+fn fo$0o(x: Vec<i32>) {}
+"#,
+            r#"
+type ${0:FooFn} = fn(x: Vec<i32>);
+
+fn foo(x: Vec<i32>) {}
+"#,
+            ParamStyle::Named.label(),
+        );
+    }
+
     #[test]
     fn generate_fn_alias_named_self() {
         check_assist_by_label(