diff --git a/testdata/src/a/doc.go b/testdata/src/a/doc.go
new file mode 100644
index 0000000..9227705
--- /dev/null
+++ b/testdata/src/a/doc.go
@@ -0,0 +1,2 @@
+// Package a this comment include duplicated word and and // want `Duplicate words \(and\) found`
+package a