impl connection recovery

e2e/e2e_test.go

@@ -22,13 +22,19 @@ func startClient(t *testing.T, hubAddr, psk string, maxConn int, mappings []clie
 // tests that need liveness detection to trigger quickly.
 func startClientWithPing(t *testing.T, hubAddr, psk string, maxConn, pingMs int, mappings []client.Mapping) *client.Client {
 	t.Helper()
-	cfg := &client.Config{
+	return startClientCfg(t, &client.Config{
 		Server:         hubAddr,
 		PSK:            psk,
 		MaxConn:        maxConn,
 		PingIntervalMs: pingMs,
 		Mappings:       mappings,
-	}
+	})
+}
+
+// startClientCfg runs an in-process client from a fully-specified config, for
+// tests that need a knob the shorthand helpers do not expose.
+func startClientCfg(t *testing.T, cfg *client.Config) *client.Client {
+	t.Helper()
 	c := client.New(cfg)
 	ctx, cancel := context.WithCancel(context.Background())
 	t.Cleanup(func() {
@@ -142,7 +148,8 @@ func TestLargeTransfer(t *testing.T) {
 }
 
 // TestConcurrentStreamsUseMultipleConns confirms the least-loaded allocator
-// opens additional worker connections once streams saturate (>8).
+// grows the pool breadth-first: concurrent streams spread over several worker
+// connections rather than stacking on one, without ever exceeding maxConn.
 func TestConcurrentStreamsUseMultipleConns(t *testing.T) {
 	const psk = "e2e-concurrent"
 	const n = 20