diff --git a/src/lib.rs b/src/lib.rs
index c4c9db1..795d9de 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -67,4 +67,11 @@ mod tests {
         let output = parser.parse("abcd").unwrap();
         assert_eq!((59, "cd"), output);
     }
+
+    #[test]
+    fn test_combinators() {
+        let parser = sequence(map(repeated(literal_char('a')), |_| 10), literal_char('b'));
+        let output = parser.parse("aaaaaaaabcd").unwrap();
+        assert_eq! {((10, 'b'), "cd"), output};
+    }
 }