diff --git a/src/ssr.rs b/src/ssr.rs
index 0ca065a..2aed227 100644
--- a/src/ssr.rs
+++ b/src/ssr.rs
@@ -202,6 +202,15 @@ mod tests {
         );
     }
 
+    #[test]
+    fn executes_iife_source() {
+        init_test();
+        let source = r##"(() => ({x: () => 'rendered HTML'}))()"##;
+
+        let mut js = Ssr::from(source.to_owned(), "").unwrap();
+        assert_eq!(js.render_to_string(None).unwrap(), "rendered HTML");
+    }
+
     #[test]
     fn pass_param_to_function() {
         init_test();