Add unit test for word.rs module registration

Co-authored-by: Tcode-Motion <188012755+Tcode-Motion@users.noreply.github.com>

Author: google-labs-jules[bot]

stdlib/src/word.rs

@@ -19,3 +19,20 @@ impl StdlibRegistry {
         );
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_register_word() {
+        let mut registry = StdlibRegistry::new();
+        registry.register_word();
+
+        let module = registry.get_module("std.word").expect("Module std.word should be registered");
+        assert_eq!(module.name, "std.word");
+        assert_eq!(module.version, "1.0.0");
+        assert!(module.exports.is_empty());
+        assert!(module.required_capabilities.is_empty());
+    }
+}