Improved test consistency

Server.go

@@ -19,6 +19,7 @@ import (
 // Server is the interface for an HTTP server.
 type Server interface {
 	Get(path string, handler Handler)
+	Ready() chan struct{}
 	Request(method string, path string, headers []Header, body io.Reader) Response
 	Router() *router.Router[Handler]
 	Run(address string) error
@@ -31,6 +32,7 @@ type server struct {
 	contextPool  sync.Pool
 	router       *router.Router[Handler]
 	errorHandler func(Context, error)
+	ready        chan struct{}
 }
 
 // NewServer creates a new HTTP server.
@@ -54,6 +56,7 @@ func NewServer() Server {
 		errorHandler: func(ctx Context, err error) {
 			log.Println(ctx.Request().Path(), err)
 		},
+		ready: make(chan struct{}),
 	}
 
 	s.contextPool.New = func() any { return s.newContext() }
@@ -65,6 +68,11 @@ func (s *server) Get(path string, handler Handler) {
 	s.Router().Add("GET", path, handler)
 }
 
+// Ready returns a channel that will be closed once the listener is ready for connection handling.
+func (s *server) Ready() chan struct{} {
+	return s.ready
+}
+
 // Request performs a synthetic request and returns the response.
 // This function keeps the response in memory so it's slightly slower than a real request.
 // However it is very useful inside tests where you don't want to spin up a real web server.
@@ -99,6 +107,7 @@ func (s *server) Run(address string) error {
 
 	stop := make(chan os.Signal, 1)
 	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
+	close(s.ready)
 	<-stop
 	return nil
 }