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|
// Package udp implements UDP test helpers. It lets you assert that certain
// strings must or must not be sent to a given local UDP listener.
package udp
import (
"net"
"runtime"
"strings"
"testing"
"time"
)
var (
addr *string
listener *net.UDPConn
Timeout time.Duration = time.Millisecond
)
type fn func()
// SetAddr sets the UDP port that will be listened on.
func SetAddr(a string) {
addr = &a
}
func start(t *testing.T) {
resAddr, err := net.ResolveUDPAddr("udp", *addr)
if err != nil {
t.Fatal(err)
}
listener, err = net.ListenUDP("udp", resAddr)
if err != nil {
t.Fatal(err)
}
}
func stop(t *testing.T) {
if err := listener.Close(); err != nil {
t.Fatal(err)
}
}
func getMessage(t *testing.T, body fn) string {
start(t)
defer stop(t)
result := make(chan string)
go func() {
message := make([]byte, 1024*32)
listener.SetReadDeadline(time.Now().Add(Timeout))
n, _, _ := listener.ReadFrom(message)
result <- string(message[0:n])
}()
body()
return <-result
}
func get(t *testing.T, match string, body fn) (got string, equals bool, contains bool) {
got = getMessage(t, body)
equals = got == match
contains = strings.Contains(got, match)
return got, equals, contains
}
func printLocation(t *testing.T) {
_, file, line, _ := runtime.Caller(2)
t.Errorf("At: %s:%d", file, line)
}
// ShouldReceiveOnly will fire a test error if the given function doesn't send
// exactly the given string over UDP.
func ShouldReceiveOnly(t *testing.T, expected string, body fn) {
got, equals, _ := get(t, expected, body)
if !equals {
printLocation(t)
t.Errorf("Expected: %#v", expected)
t.Errorf("But got: %#v", got)
}
}
// ShouldNotReceiveOnly will fire a test error if the given function sends
// exactly the given string over UDP.
func ShouldNotReceiveOnly(t *testing.T, notExpected string, body fn) {
_, equals, _ := get(t, notExpected, body)
if equals {
printLocation(t)
t.Errorf("Expected not to get: %#v", notExpected)
}
}
// ShouldReceive will fire a test error if the given function doesn't send the
// given string over UDP.
func ShouldReceive(t *testing.T, expected string, body fn) {
got, _, contains := get(t, expected, body)
if !contains {
printLocation(t)
t.Errorf("Expected to find: %#v", expected)
t.Errorf("But got: %#v", got)
}
}
// ShouldNotReceive will fire a test error if the given function sends the
// given string over UDP.
func ShouldNotReceive(t *testing.T, expected string, body fn) {
got, _, contains := get(t, expected, body)
if contains {
printLocation(t)
t.Errorf("Expected not to find: %#v", expected)
t.Errorf("But got: %#v", got)
}
}
// ShouldReceiveAll will fire a test error unless all of the given strings are
// sent over UDP.
func ShouldReceiveAll(t *testing.T, expected []string, body fn) {
got := getMessage(t, body)
failed := false
for _, str := range expected {
if !strings.Contains(got, str) {
if !failed {
printLocation(t)
failed = true
}
t.Errorf("Expected to find: %#v", str)
}
}
if failed {
t.Errorf("But got: %#v", got)
}
}
// ShouldNotReceiveAny will fire a test error if any of the given strings are
// sent over UDP.
func ShouldNotReceiveAny(t *testing.T, unexpected []string, body fn) {
got := getMessage(t, body)
failed := false
for _, str := range unexpected {
if strings.Contains(got, str) {
if !failed {
printLocation(t)
failed = true
}
t.Errorf("Expected not to find: %#v", str)
}
}
if failed {
t.Errorf("But got: %#v", got)
}
}
func ShouldReceiveAllAndNotReceiveAny(t *testing.T, expected []string, unexpected []string, body fn) {
got := getMessage(t, body)
failed := false
for _, str := range expected {
if !strings.Contains(got, str) {
if !failed {
printLocation(t)
failed = true
}
t.Errorf("Expected to find: %#v", str)
}
}
for _, str := range unexpected {
if strings.Contains(got, str) {
if !failed {
printLocation(t)
failed = true
}
t.Errorf("Expected not to find: %#v", str)
}
}
if failed {
t.Errorf("but got: %#v", got)
}
}
|
