Add a comment test

Author: A4-Tacks

crates/ide-completion/src/tests/fn_param.rs

@@ -15,6 +15,20 @@ fn baz(file$0) {}
 fn foo(file_id: usize) {}
 fn bar(file_id: usize) {}
 fn baz(file_id: usize) {}
+"#,
+    );
+
+    check_edit(
+        "file_id: usize",
+        r#"
+fn foo(file_id: usize) {}
+fn bar(file_id: usize) {}
+fn baz(/*...*/ file$0) {}
+"#,
+        r#"
+fn foo(file_id: usize) {}
+fn bar(file_id: usize) {}
+fn baz(/*...*/ file_id: usize) {}
 "#,
     );
 }