Fix test

cmd/publish_test.go

@@ -17,6 +17,7 @@ func TestCLI_Publish_Subscribe_Poll_Real_Server(t *testing.T) {
 
 	app, _, _, _ := newTestApp()
 	require.Nil(t, app.Run([]string{"ntfy", "publish", "ntfytest", "ntfy unit test " + testMessage}))
+	time.Sleep(3 * time.Second) // Since #502, ntfy.sh writes messages to the cache asynchronously, after a timeout of ~1.5s
 
 	app2, _, stdout, _ := newTestApp()
 	require.Nil(t, app2.Run([]string{"ntfy", "subscribe", "--poll", "ntfytest"}))