diff --git a/src_v2/parser/parser_internals.nim b/src_v2/parser/parser_internals.nim
index d546bee..0f7bc82 100644
--- a/src_v2/parser/parser_internals.nim
+++ b/src_v2/parser/parser_internals.nim
@@ -263,3 +263,4 @@ when isMainModule:
     assert initParserResult("1").flatMap(ch1).isStreamCompleted() == true
     assert initParserResult("12").flatMap(ch1).isStreamCompleted() == false
     assert initParserResult("").flatMap(ch1).isStreamCompleted() == false
+    assert testParser123.flatMap(str("123")).isStreamCompleted() == true