diff --git a/stdlib/src/barcode.rs b/stdlib/src/barcode.rs
index 268534da..6cb8f87d 100644
--- a/stdlib/src/barcode.rs
+++ b/stdlib/src/barcode.rs
@@ -19,3 +19,23 @@ impl StdlibRegistry {
         );
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::StdlibRegistry;
+
+    #[test]
+    fn test_register_barcode() {
+        let mut registry = StdlibRegistry::new();
+        // Since `StdlibRegistry::new()` calls `register_defaults()`, which calls `register_barcode()`,
+        // the module should already be registered.
+
+        let module = registry
+            .get_module("std.barcode")
+            .expect("Module should be registered");
+        assert_eq!(module.name, "std.barcode");
+        assert_eq!(module.version, "1.0.0");
+        assert_eq!(module.required_capabilities.len(), 0);
+    }
+}