Reduce timeout for non-existent server tests

challenge/dns01/nameserver_test.go

@@ -5,6 +5,7 @@ import (
  "sort"
  "sync"
  "testing"
+ "time"
 
  "github.com/miekg/dns"
  "github.com/stretchr/testify/assert"
@@ -195,6 +196,7 @@ var findXByFqdnTestCases = []struct {
  primaryNs string
  nameservers []string
  expectedError string // regular expression
+ timeout time.Duration
 }{
  {
  desc: "domain is a CNAME",
@@ -237,6 +239,7 @@ var findXByFqdnTestCases = []struct {
  zone: "google.com.",
  primaryNs: "ns1.google.com.",
  nameservers: []string{":7053", ":8053", "8.8.8.8:53"},
+ timeout: 500 * time.Millisecond,
  },
  {
  desc: "only non-existent nameservers",
@@ -246,7 +249,8 @@ var findXByFqdnTestCases = []struct {
  // NOTE: On Windows, net.DialContext finds a way down to the ContectEx syscall.
  // There a fault is marked as "connectex", not "connect", see
  // https://cs.opensource.google/go/go/+/refs/tags/go1.19.5:src/net/fd_windows.go;l=112
- expectedError: `^could not find the start of authority for mail\.google\.com.: dial tcp :9053: connect(ex)?:`,
+ expectedError: `^could not find the start of authority for mail\.google\.com.: dial tcp :9053:.+`,
+ timeout: 500 * time.Millisecond,
  },
  {
  desc: "no nameservers",
@@ -277,6 +281,11 @@ func TestFindZoneByFqdnCustom(t *testing.T) {
 func TestFindPrimaryNsByFqdnCustom(t *testing.T) {
  for _, test := range findXByFqdnTestCases {
  t.Run(test.desc, func(t *testing.T) {
+ origTimeout := dnsTimeout
+ if test.timeout > 0 {
+ dnsTimeout = test.timeout
+ }
+
  ClearFqdnCache()
 
  ns, err := FindPrimaryNsByFqdnCustom(test.fqdn, test.nameservers)
@@ -287,6 +296,8 @@ func TestFindPrimaryNsByFqdnCustom(t *testing.T) {
  require.NoError(t, err)
  assert.Equal(t, test.primaryNs, ns)
  }
+
+ dnsTimeout = origTimeout
  })
  }
 }