diff -Naur -x '*.orig' exporter-toolkit-0.7.1/web/handler_test.go exporter-toolkit-0.7.1-fix-race-condition/web/handler_test.go
--- exporter-toolkit-0.7.1/web/handler_test.go	2021-12-02 00:21:56.000000000 +0100
+++ exporter-toolkit-0.7.1-fix-race-condition/web/handler_test.go	2022-11-22 11:53:05.608183773 +0100
@@ -18,6 +18,7 @@
 	"net/http"
 	"sync"
 	"testing"
+	"time"
 )
 
 // TestBasicAuthCache validates that the cache is working by calling a password
@@ -42,6 +43,7 @@
 		ListenAndServe(server, "testdata/web_config_users_noTLS.good.yml", testlogger)
 		close(done)
 	}()
+	time.Sleep(250 * time.Millisecond)
 
 	login := func(username, password string, code int) {
 		client := &http.Client{}
@@ -106,6 +108,7 @@
 		ListenAndServe(server, "testdata/web_config_users_noTLS.good.yml", testlogger)
 		close(done)
 	}()
+	time.Sleep(250 * time.Millisecond)
 
 	login := func() {
 		client := &http.Client{}
@@ -150,6 +153,7 @@
 		ListenAndServe(server, "testdata/web_config_headers.good.yml", testlogger)
 		close(done)
 	}()
+	time.Sleep(250 * time.Millisecond)
 
 	client := &http.Client{}
 	req, err := http.NewRequest("GET", "http://localhost"+port, nil)