diff --git a/tests/parser.cpp b/tests/parser.cpp
index 0815d3d6..40d81baa 100644
--- a/tests/parser.cpp
+++ b/tests/parser.cpp
@@ -49,6 +49,7 @@ static std::vector<std::string> valid_queries = {
     "0 contains 0",
     "0 BeGiNsWiTh 0",
     "0 ENDSWITH 0",
+    "contains contains 'contains'",
 
     // atoms/groups
     "(0=0)",