feat: enhance JavaScript test snippet with class and module exports

tests/basic/test_repomap.py

@@ -407,8 +407,34 @@ class TestRepoMapAllLanguages(unittest.TestCase):
             ),
             "javascript": (
                 "test.js",
-                "var greet= 1;function greet(name) {\n    console.log(`Hello, ${name}!`);\n}\n",
-                "greet",  # Key symbol to check
+                """// Class definition
+class Person {
+    constructor(name) {
+        this.name = name;
+    }
+    
+    sayHello() {
+        return `Hello, ${this.name}!`;
+    }
+}
+
+// Function declaration
+function greet(person) {
+    return person.sayHello();
+}
+
+// Variables and constants
+const DEFAULT_NAME = 'World';
+let currentPerson = new Person(DEFAULT_NAME);
+
+// Export for use in other modules
+module.exports = {
+    Person,
+    greet,
+    DEFAULT_NAME
+};
+""",
+                "Person",  # Key symbol to check
             ),
             "ocaml": (
                 "test.ml",