You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: config_test.go
    path of file: ./repos/AdGuardHome/internal/dhcpsvc
    
    the code of the file until where you have to start completion: package dhcpsvc_test

import (
	"testing"

	"github.com/AdguardTeam/AdGuardHome/internal/dhcpsvc"
	"github.com/AdguardTeam/golibs/testutil"
)

func TestConfig_Validate(t *testing.T) {
	testCases := []struct {
		name       string
		conf       *dhcpsvc.Config
		wantErrMsg string
	}{{
		name:       "nil_config",
		conf:       nil,
		wantErrMsg: "config is nil",
	}, {
		name:       "disabled",
		conf:       &dhcpsvc.Config{},
		wantErrMsg: "",
	}, {
		name: "empty",
		conf: &dhcpsvc.Con
    
func TestConfig_Validate(t *testing.T) {
	testCases := []struct {
		name       string
		conf       *dhcpsvc.Config
		wantErrMsg string
	}{{
		name:       "nil_config",
		conf:       nil,
		wantErrMsg: "config is nil",
	}, {
		name:       "disabled",
		conf:       &dhcpsvc.Config{},
		wantErrMsg: "",
	}, {
		name: "empty",
		conf: &dhcpsvc.Config{
			Enabled: true,
		},
		wantErrMsg: `bad domain name "": domain name is empty`,
	}, {
		conf: &dhcpsvc.Config{
			Enabled:         true,
			LocalDomainName: testLocalTLD,
			Interfaces:      nil,
		},
		name:       "no_interfaces",
		wantErrMsg: "no interfaces specified",
	}, {
		conf: &dhcpsvc.Config{
			Enabled:         true,
			LocalDomainName: testLocalTLD,
			Interfaces:      nil,
		},
		name:       "no_interfaces",
		wantErrMsg: "no interfaces specified",
	}, {
		conf: &dhcpsvc.Config{
			Enabled:         true,
			LocalDomainName: testLocalTLD,
			Interfaces: map[string]*dhcpsvc.InterfaceConfig{
				"eth0": nil,
			},
		},
		name:       "nil_interface",
		wantErrMsg: `interface "eth0": config is nil`,
	}, {
		conf: &dhcpsvc.Config{
			Enabled:         true,
			LocalDomainName: testLocalTLD,
			Interfaces: map[string]*dhcpsvc.InterfaceConfig{
				"eth0": {
					IPv4: nil,
					IPv6: &dhcpsvc.IPv6Config{Enabled: false},
				},
			},
		},
		name:       "nil_ipv4",
		wantErrMsg: `interface "eth0": ipv4: config is nil`,
	}, {
		conf: &dhcpsvc.Config{
			Enabled:         true,
			LocalDomainName: testLocalTLD,
			Interfaces: map[string]*dhcpsvc.InterfaceConfig{
				"eth0": {
					IPv4: &dhcpsvc.IPv4Config{Enabled: false},
					IPv6: nil,
				},
			},
		},
		name:       "nil_ipv6",
		wantErrMsg: `interface "eth0": ipv6: config is nil`,
	}}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			testutil.AssertErrorMsg(t, tc.wantErrMsg, tc.conf.Validate())
		})
	}
}