diff --git a/quic/test_tools/quic_config_peer.h b/quic/test_tools/quic_config_peer.h
new file mode 100644
index 0000000..6e2653b
--- /dev/null
+++ b/quic/test_tools/quic_config_peer.h
@@ -0,0 +1,51 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef QUICHE_QUIC_TEST_TOOLS_QUIC_CONFIG_PEER_H_
+#define QUICHE_QUIC_TEST_TOOLS_QUIC_CONFIG_PEER_H_
+
+#include "base/macros.h"
+#include "net/third_party/quiche/src/quic/core/quic_config.h"
+#include "net/third_party/quiche/src/quic/core/quic_packets.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_uint128.h"
+
+namespace quic {
+
+class QuicConfig;
+
+namespace test {
+
+class QuicConfigPeer {
+ public:
+  QuicConfigPeer() = delete;
+
+  static void SetReceivedInitialStreamFlowControlWindow(QuicConfig* config,
+                                                        uint32_t window_bytes);
+
+  static void SetReceivedInitialSessionFlowControlWindow(QuicConfig* config,
+                                                         uint32_t window_bytes);
+
+  static void SetReceivedConnectionOptions(QuicConfig* config,
+                                           const QuicTagVector& options);
+
+  static void SetReceivedBytesForConnectionId(QuicConfig* config,
+                                              uint32_t bytes);
+
+  static void SetReceivedDisableConnectionMigration(QuicConfig* config);
+
+  static void SetReceivedMaxIncomingDynamicStreams(QuicConfig* config,
+                                                   uint32_t max_streams);
+
+  static void SetConnectionOptionsToSend(QuicConfig* config,
+                                         const QuicTagVector& options);
+
+  static void SetReceivedStatelessResetToken(QuicConfig* config,
+                                             QuicUint128 token);
+};
+
+}  // namespace test
+
+}  // namespace quic
+
+#endif  // QUICHE_QUIC_TEST_TOOLS_QUIC_CONFIG_PEER_H_