test: enhance OCaml test case with module and type definitions

tests/basic/test_repomap.py

@@ -451,8 +451,27 @@ module.exports = {
             ),
             "ocaml": (
                 "test.ml",
-                'let greet name =\n  Printf.printf "Hello, %s!\\n" name\n',
-                "greet",  # Key symbol to check
+                """(* Module definition *)
+module Greeter = struct
+  type person = {
+    name: string;
+    age: int
+  }
+
+  let create_person name age = 
+    {name; age}
+
+  let greet person =
+    Printf.printf "Hello, %s! You are %d years old.\\n" 
+      person.name person.age
+end
+
+(* Outside the module *)
+let () = 
+  let person = Greeter.create_person "Alice" 30 in
+  Greeter.greet person
+""",
+                "Greeter",  # Key symbol to check
             ),
             "php": (
                 "test.php",