fix

internal/model/txt_test.go

@@ -0,0 +1,30 @@
+package model
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestQuoteTXTAndPayloadRoundTrip(t *testing.T) {
+	long := "v=DKIM1; p=" + strings.Repeat("A", 400)
+	for _, v := range []string{"v=spf1 ~all", long, `a"b\c`} {
+		q := QuoteTXT(v)
+		if !strings.HasPrefix(q, `"`) {
+			t.Fatalf("not quoted: %q", q)
+		}
+		if got := TXTPayload(q); got != v {
+			t.Fatalf("roundtrip: got %q want %q", got, v)
+		}
+		if TXTPayload(v) != v && !strings.HasPrefix(v, `"`) {
+			t.Fatalf("unquoted payload changed")
+		}
+	}
+	if QuoteTXT(`"x"`) != `"x"` {
+		t.Fatal("quoted must pass through")
+	}
+	a := Record{Type: TXT, Values: []string{"v=DKIM1; k=rsa"}}
+	b := Record{Type: TXT, Values: []string{`"v=DKIM1; k=rsa"`}}
+	if !a.Equal(b) {
+		t.Fatal("quoted and unquoted must compare equal")
+	}
+}