/
dns_resolver_test.go
60 lines (48 loc) · 1.51 KB
/
dns_resolver_test.go
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package dns_resolver
import (
"fmt"
"reflect"
"testing"
"github.com/miekg/dns"
)
func TestNew(t *testing.T) {
servers := []string{"8.8.8.8", "8.8.4.4"}
expectedServers := []string{"8.8.8.8:53", "8.8.4.4:53"}
resolver := New(servers)
if !reflect.DeepEqual(resolver.Servers, expectedServers) {
t.Error("resolver.Servers: ", resolver.Servers, "should be equal to", expectedServers)
}
}
func TestNewFromResolvConf_ValidFile(t *testing.T) {
path := "resolv.conf"
resolver, err := NewFromResolvConf(path)
config, _ := dns.ClientConfigFromFile(path)
expectedServers := []string{}
for _, server := range config.Servers {
expectedServers = append(expectedServers, server+":53")
}
if !reflect.DeepEqual(resolver.Servers, expectedServers) {
t.Error("resolver.Servers: ", resolver.Servers, "should be equal to", expectedServers)
}
if err != nil {
t.Error("Should parse config file without errors. Error: ", err.Error())
}
}
func TestNewFromResolvConf_InvalidFile(t *testing.T) {
path := "resolv_err.conf"
_, err := NewFromResolvConf(path)
if err.Error() != "no such file or directory: resolv_err.conf" {
t.Error("Should return error")
}
}
func TestLookupHost_ValidServer(t *testing.T) {
resolver := New([]string{"8.8.8.8", "8.8.4.4"})
result, err := resolver.LookupHost("google-public-dns-a.google.com")
if err != nil {
fmt.Println(err.Error())
t.Error("Should succeed dns lookup")
}
if result[0].String() != "8.8.8.8" {
t.Error("google-public-dns-a.google.com should be resolved to 8.8.8.8")
}
}