test: add test to verify bug

Shows the problem mentioned in #186

tooling/test/header_test.go

@@ -0,0 +1,28 @@
+package test
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestHeader(t *testing.T) {
+	// Manually create a response object with headers
+	resp := &http.Response{
+		Header: http.Header{
+			"Access-Control-Allow-Headers": []string{"Content-Type, Range, User-Agent, X-Requested-With"},
+		},
+	}
+
+	// Extract headers from the response
+	headers := resp.Header["Access-Control-Allow-Headers"]
+
+	// Test the HeaderBuilder function
+	hb := Header("Access-Control-Allow-Headers").Has("Content-Type", "Range", "User-Agent", "X-Requested-With")
+
+	checkOutput := hb.Check_.Check(headers)
+
+	// Check if the headers satisfy the conditions
+	assert.True(t, checkOutput.Success, checkOutput.Reason)
+}