fix: ooporthelper connection_refused (#974)

Closes https://github.com/ooni/probe/issues/2338

Co-authored-by: decfox <decfox@github.com>

internal/cmd/ooporthelper/main_test.go

@@ -9,13 +9,19 @@ import (
 	"github.com/ooni/probe-cli/v3/internal/netxlite"
 )
 
+var (
+	portsMap = make(map[string]bool)
+)
+
 func TestMainWorkingAsIntended(t *testing.T) {
-	t.Skip("// TODO(https://github.com/ooni/probe/issues/2338)")
 	srvTest = true // toggle to imply that we are running in test mode
+	for _, port := range TestPorts {
+		portsMap[port] = false
+	}
 	go main()
 	dialer := netxlite.NewDialerWithoutResolver(model.DiscardLogger)
-	for _, port := range TestPorts {
-		<-srvTestChan
+	for i := 0; i < len(TestPorts); i++ {
+		port := <-srvTestChan
 		addr := net.JoinHostPort("127.0.0.1", port)
 		ctx := context.Background()
 		conn, err := dialer.DialContext(ctx, "tcp", addr)
@@ -26,7 +32,14 @@ func TestMainWorkingAsIntended(t *testing.T) {
 			t.Fatal("expected non-nil conn")
 		}
 		conn.Close()
+		portsMap[port] = true
 	}
 	srvCancel()  // shutdown server
 	srvWg.Wait() // wait for listeners on all ports to close
+	// check if all ports were covered
+	for _, port := range TestPorts {
+		if !portsMap[port] {
+			t.Fatal("missed port in test", port)
+		}
+	}
 }