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: error_test.go
    path of file: ./repos/gccrs/libgo/go/net
    
    the code of the file until where you have to start completion: // Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build !js

package net

import (
	"context"
	"errors"
	"fmt"
	"internal/poll"
	"io"
	"io/fs"
	"net/
    
func TestDialAddrError(t *testing.T) {
	switch runtime.GOOS {
	case "plan9":
		t.Skipf("not supported on %s", runtime.GOOS)
	}
	if !supportsIPv4() || !supportsIPv6() {
		t.Skip("both IPv4 and IPv6 are required")
	}

	for _, tt := range []struct {
		network string
		lit     string
		addr    *TCPAddr
	}{
		{"tcp4", "::1", nil},
		{"tcp4", "", &TCPAddr{IP: IPv6loopback}},
		// We don't test the {"tcp6", "byte sequence", nil}
		// case for now because there is no easy way to
		// control name resolution.
		{"tcp6", "", &TCPAddr{IP: IP{0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef}}},
	} {
		var err error
		var c Conn
		var op string
		if tt.lit != "" {
			c, err = Dial(tt.network, JoinHostPort(tt.lit, "0"))
			op = fmt.Sprintf("Dial(%q, %q)", tt.network, JoinHostPort(tt.lit, "0"))
		} else {
			c, err = DialTCP(tt.network, nil, tt.addr)
			op = fmt.Sprintf("DialTCP(%q, %q)", tt.network, tt.addr)
		}
		if err == nil {
			c.Close()
			t.Errorf("%s succeeded, want error", op)
			continue
		}
		if perr := parseDialError(err); perr != nil {
			t.Errorf("%s: %v", op, perr)
			continue
		}
		operr := err.(*OpError).Err
		aerr, ok := operr.(*AddrError)
		if !ok {
			t.Errorf("%s: %v is %T, want *AddrError", op, err, operr)
			continue
		}
		want := tt.lit
		if tt.lit == "" {
			want = tt.addr.IP.String()
		}
		if aerr.Addr != want {
			t.Errorf("%s: %v, error Addr=%q, want %q", op, err, aerr.Addr, want)
		}
	}
}