1 files changed, 33 insertions, 0 deletions

diff --git a/test/edns0_test.go b/test/edns0_test.go
new file mode 100644
index 000000000..6cb1af958
--- /dev/null
+++ b/test/edns0_test.go
@@ -0,0 +1,33 @@
+package test
+
+import (
+	"testing"
+
+	"github.com/miekg/dns"
+)
+
+func TestEDNS0(t *testing.T) {
+	corefile := `.:0 {
+		whoami
+}
+`
+
+	i, udp, _, err := CoreDNSServerAndPorts(corefile)
+	if err != nil {
+		t.Fatalf("Could not get CoreDNS serving instance: %s", err)
+	}
+	defer i.Stop()
+
+	m := new(dns.Msg)
+	m.SetQuestion("example.org.", dns.TypeSOA)
+	m.SetEdns0(4096, true)
+
+	resp, err := dns.Exchange(m, udp)
+	if err != nil {
+		t.Fatalf("Expected to receive reply, but didn't: %v", err)
+	}
+	opt := resp.Extra[len(resp.Extra)-1]
+	if opt.Header().Rrtype != dns.TypeOPT {
+		t.Errorf("Last RR must be OPT record")
+	}
+}