рабочий вариант, но скороть 10 МБит

agents/rap-node-agent/internal/fabricproto/session_test.go

@@ -129,20 +129,36 @@ func TestSessionResetDropsOnlySelectedStream(t *testing.T) {
 }
 
 func TestSessionAckUpdatesMetrics(t *testing.T) {
-	session := NewSession(SessionConfig{})
+	session := NewSession(SessionConfig{InitialStreamCredit: 2})
 	mustOpenStream(t, session, 1, TrafficClassReliable)
 	mustEnqueue(t, session, 1, "one")
 	mustEnqueue(t, session, 1, "two")
+	if _, err := session.EnqueueData(1, []byte("blocked")); !errors.Is(err, ErrStreamCreditExhausted) {
+		t.Fatalf("credit error = %v, want %v", err, ErrStreamCreditExhausted)
+	}
 
 	if err := session.Ack(1, 2); err != nil {
 		t.Fatalf("ack: %v", err)
 	}
+	mustEnqueue(t, session, 1, "three")
 	snapshot := session.Snapshot()
-	if snapshot.FramesAcked != 2 || snapshot.Streams[1].Acked != 2 {
+	if snapshot.FramesAcked != 2 || snapshot.Streams[1].Acked != 2 || snapshot.Streams[1].Credit != 1 {
 		t.Fatalf("ack metrics = %+v stream=%+v", snapshot, snapshot.Streams[1])
 	}
 }
 
+func TestSessionCreditIsCapped(t *testing.T) {
+	session := NewSession(SessionConfig{InitialStreamCredit: 1, MaxStreamCredit: 2})
+	mustOpenStream(t, session, 1, TrafficClassReliable)
+	if err := session.AddCredit(1, 100); err != nil {
+		t.Fatalf("add credit: %v", err)
+	}
+	snapshot := session.Snapshot()
+	if snapshot.Streams[1].Credit != 2 {
+		t.Fatalf("credit = %d, want cap 2", snapshot.Streams[1].Credit)
+	}
+}
+
 func TestSessionCloseRejectsNewData(t *testing.T) {
 	session := NewSession(SessionConfig{})
 	mustOpenStream(t, session, 1, TrafficClassReliable)