From b329b276e07d7d4fde3b86e402d603e78eeee192 Mon Sep 17 00:00:00 2001
From: Carlos Alexandro Becker <caarlos0@users.noreply.github.com>
Date: Wed, 24 May 2023 16:36:57 +0000
Subject: [PATCH] test: random port: prevent port reuse

---
 server/test/test.go | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/server/test/test.go b/server/test/test.go
index a9d4d0eca7ac48899385dd23254c66f1249e2855..bfaac42c594791536d233685a87bf28f37dc2ba5 100644
--- a/server/test/test.go
+++ b/server/test/test.go
@@ -1,11 +1,29 @@
 package test
 
-import "net"
+import (
+	"net"
+	"sync"
+)
+
+var (
+	used = map[int]struct{}{}
+	lock sync.Mutex
+)
 
 // RandomPort returns a random port number.
 // This is mainly used for testing.
 func RandomPort() int {
 	addr, _ := net.Listen("tcp", ":0") //nolint:gosec
 	_ = addr.Close()
-	return addr.Addr().(*net.TCPAddr).Port
+	port := addr.Addr().(*net.TCPAddr).Port
+	lock.Lock()
+
+	if _, ok := used[port]; ok {
+		lock.Unlock()
+		return RandomPort()
+	}
+
+	used[port] = struct{}{}
+	lock.Unlock()
+	return port
 }