gtx

diff --git a/helper_test.go b/helper_test.go
new file mode 100644
index 0000000..f62d053
--- /dev/null
+++ b/helper_test.go
@@ -0,0 +1,19 @@
+package main
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestContains(t *testing.T) {
+	words := strings.Fields("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.")
+
+	for _, w := range words {
+		match := contains(words, w)
+
+		if !match {
+			t.Errorf("failed to match %v", w)
+			t.Fail()
+		}
+	}
+}