refactor: move quicdialing base functionality to netxlite (#406)

Part of https://github.com/ooni/probe/issues/1505

internal/netxlite/quic_test.go

@@ -0,0 +1,114 @@
+package netxlite
+
+import (
+	"context"
+	"crypto/tls"
+	"errors"
+	"log"
+	"net"
+	"strings"
+	"testing"
+
+	"github.com/lucas-clemente/quic-go"
+	"github.com/ooni/probe-cli/v3/internal/netxmocks"
+)
+
+func TestQUICDialerQUICGoCannotSplitHostPort(t *testing.T) {
+	tlsConfig := &tls.Config{
+		NextProtos: []string{"h3"},
+		ServerName: "www.google.com",
+	}
+	systemdialer := QUICDialerQUICGo{
+		QUICListener: &QUICListenerStdlib{},
+	}
+	ctx := context.Background()
+	sess, err := systemdialer.DialContext(
+		ctx, "udp", "a.b.c.d", tlsConfig, &quic.Config{})
+	if err == nil || !strings.HasSuffix(err.Error(), "missing port in address") {
+		t.Fatal("not the error we expected", err)
+	}
+	if sess != nil {
+		t.Fatal("expected nil sess here")
+	}
+}
+
+func TestQUICDialerQUICGoInvalidPort(t *testing.T) {
+	tlsConfig := &tls.Config{
+		NextProtos: []string{"h3"},
+		ServerName: "www.google.com",
+	}
+	systemdialer := QUICDialerQUICGo{
+		QUICListener: &QUICListenerStdlib{},
+	}
+	ctx := context.Background()
+	sess, err := systemdialer.DialContext(
+		ctx, "udp", "8.8.4.4:xyz", tlsConfig, &quic.Config{})
+	if err == nil || !strings.HasSuffix(err.Error(), "invalid syntax") {
+		t.Fatal("not the error we expected", err)
+	}
+	if sess != nil {
+		t.Fatal("expected nil sess here")
+	}
+}
+
+func TestQUICDialerQUICGoInvalidIP(t *testing.T) {
+	tlsConfig := &tls.Config{
+		NextProtos: []string{"h3"},
+		ServerName: "www.google.com",
+	}
+	systemdialer := QUICDialerQUICGo{
+		QUICListener: &QUICListenerStdlib{},
+	}
+	ctx := context.Background()
+	sess, err := systemdialer.DialContext(
+		ctx, "udp", "a.b.c.d:0", tlsConfig, &quic.Config{})
+	if !errors.Is(err, errInvalidIP) {
+		t.Fatal("not the error we expected", err)
+	}
+	if sess != nil {
+		t.Fatal("expected nil sess here")
+	}
+}
+
+func TestQUICDialerQUICGoCannotListen(t *testing.T) {
+	expected := errors.New("mocked error")
+	tlsConfig := &tls.Config{
+		NextProtos: []string{"h3"},
+		ServerName: "www.google.com",
+	}
+	systemdialer := QUICDialerQUICGo{
+		QUICListener: &netxmocks.QUICListener{
+			MockListen: func(addr *net.UDPAddr) (net.PacketConn, error) {
+				return nil, expected
+			},
+		},
+	}
+	ctx := context.Background()
+	sess, err := systemdialer.DialContext(
+		ctx, "udp", "8.8.8.8:443", tlsConfig, &quic.Config{})
+	if !errors.Is(err, expected) {
+		t.Fatal("not the error we expected", err)
+	}
+	if sess != nil {
+		t.Fatal("expected nil sess here")
+	}
+}
+
+func TestQUICDialerWorksAsIntended(t *testing.T) {
+	tlsConfig := &tls.Config{
+		NextProtos: []string{"h3"},
+		ServerName: "dns.google",
+	}
+	systemdialer := QUICDialerQUICGo{
+		QUICListener: &QUICListenerStdlib{},
+	}
+	ctx := context.Background()
+	sess, err := systemdialer.DialContext(
+		ctx, "udp", "8.8.8.8:443", tlsConfig, &quic.Config{})
+	if err != nil {
+		t.Fatal("not the error we expected", err)
+	}
+	if err := sess.CloseWithError(0, ""); err != nil {
+		log.Fatal(err)
+	}
+}