refactor: move remaining language examples to fixture files

tests/fixtures/languages/javascript/test.js

@@ -0,0 +1,26 @@
+// 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
+};