Use interface instead of *testing.T

go.mod

@@ -0,0 +1,3 @@
+module github.com/stvp/go-udp-testing
+
+go 1.18.0

udp.go

@@ -6,7 +6,6 @@ import (
 	"net"
 	"runtime"
 	"strings"
-	"testing"
 	"time"
 )
 
@@ -16,6 +15,12 @@ var (
 	Timeout  = time.Millisecond
 )
 
+// TestingT interface for the methods used from *testing.T
+type TestingT interface {
+	Fatal(args ...any)
+	Errorf(format string, args ...any)
+}
+
 type fn func()
 
 // SetAddr sets the UDP port that will be listened on.
@@ -35,7 +40,7 @@ func WriteTo(b []byte, addr net.Addr) (n int, err error) {
 	return listener.WriteTo(b, addr)
 }
 
-func start(t *testing.T) {
+func start(t TestingT) {
 	resAddr, err := net.ResolveUDPAddr("udp", *addr)
 	if err != nil {
 		t.Fatal(err)
@@ -46,13 +51,13 @@ func start(t *testing.T) {
 	}
 }
 
-func stop(t *testing.T) {
+func stop(t TestingT) {
 	if err := listener.Close(); err != nil {
 		t.Fatal(err)
 	}
 }
 
-func getMessage(t *testing.T, body fn) string {
+func getMessage(t TestingT, body fn) string {
 	start(t)
 	defer stop(t)
 
@@ -73,21 +78,21 @@ func getMessage(t *testing.T, body fn) string {
 	return string(message[0:bufLen])
 }
 
-func get(t *testing.T, match string, body fn) (got string, equals bool, contains bool) {
+func get(t TestingT, 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) {
+func printLocation(t TestingT) {
 	_, 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) {
+func ShouldReceiveOnly(t TestingT, expected string, body fn) {
 	got, equals, _ := get(t, expected, body)
 	if !equals {
 		printLocation(t)
@@ -98,7 +103,7 @@ func ShouldReceiveOnly(t *testing.T, expected string, body fn) {
 
 // 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) {
+func ShouldNotReceiveOnly(t TestingT, notExpected string, body fn) {
 	_, equals, _ := get(t, notExpected, body)
 	if equals {
 		printLocation(t)
@@ -108,7 +113,7 @@ func ShouldNotReceiveOnly(t *testing.T, notExpected string, body fn) {
 
 // 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) {
+func ShouldReceive(t TestingT, expected string, body fn) {
 	got, _, contains := get(t, expected, body)
 	if !contains {
 		printLocation(t)
@@ -119,7 +124,7 @@ func ShouldReceive(t *testing.T, expected string, body fn) {
 
 // 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) {
+func ShouldNotReceive(t TestingT, expected string, body fn) {
 	got, _, contains := get(t, expected, body)
 	if contains {
 		printLocation(t)
@@ -130,7 +135,7 @@ func ShouldNotReceive(t *testing.T, expected string, body fn) {
 
 // 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) {
+func ShouldReceiveAll(t TestingT, expected []string, body fn) {
 	got := getMessage(t, body)
 	failed := false
 
@@ -151,7 +156,7 @@ func ShouldReceiveAll(t *testing.T, expected []string, body fn) {
 
 // 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) {
+func ShouldNotReceiveAny(t TestingT, unexpected []string, body fn) {
 	got := getMessage(t, body)
 	failed := false
 
@@ -170,7 +175,7 @@ func ShouldNotReceiveAny(t *testing.T, unexpected []string, body fn) {
 	}
 }
 
-func ShouldReceiveAllAndNotReceiveAny(t *testing.T, expected []string, unexpected []string, body fn) {
+func ShouldReceiveAllAndNotReceiveAny(t TestingT, expected []string, unexpected []string, body fn) {
 	got := getMessage(t, body)
 	failed := false
 
@@ -198,6 +203,6 @@ func ShouldReceiveAllAndNotReceiveAny(t *testing.T, expected []string, unexpecte
 	}
 }
 
-func ReceiveString(t *testing.T, body fn) string {
+func ReceiveString(t TestingT, body fn) string {
 	return getMessage(t, body)
 }