Reject the descriptions that attempt to change the order of m= section in current local description.

webrtc/pc/webrtcsession_unittest.cc

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 52 matching lines @@
 using webrtc::JsepSessionDescription;
 using webrtc::PeerConnectionFactoryInterface;
 using webrtc::PeerConnectionInterface;
 using webrtc::SessionDescriptionInterface;
 using webrtc::SessionStats;
 using webrtc::StreamCollection;
 using webrtc::WebRtcSession;
 using webrtc::kBundleWithoutRtcpMux;
 using webrtc::kCreateChannelFailed;
 using webrtc::kInvalidSdp;
-using webrtc::kMlineMismatch;
+using webrtc::kMlineMismatchInAnswer;
 using webrtc::kPushDownTDFailed;
 using webrtc::kSdpWithoutIceUfragPwd;
 using webrtc::kSdpWithoutDtlsFingerprint;
 using webrtc::kSdpWithoutSdesCrypto;
 using webrtc::kSessionError;
 using webrtc::kSessionErrorDesc;
 using webrtc::kMaxUnsignalledRecvStreams;
 
 typedef PeerConnectionInterface::RTCOfferAnswerOptions RTCOfferAnswerOptions;
 
@@ skipping 3653 matching lines @@
       CreateRemoteAnswer(session_->local_description()));
 
   cricket::SessionDescription* answer_copy = answer->description()->Copy();
   answer_copy->RemoveContentByName("video");
   JsepSessionDescription* modified_answer =
       new JsepSessionDescription(JsepSessionDescription::kAnswer);
 
   EXPECT_TRUE(modified_answer->Initialize(answer_copy,
                                           answer->session_id(),
                                           answer->session_version()));
-  SetRemoteDescriptionAnswerExpectError(kMlineMismatch, modified_answer);
+  SetRemoteDescriptionAnswerExpectError(kMlineMismatchInAnswer,
+                                        modified_answer);
 
   // Different content names.
   std::string sdp;
   EXPECT_TRUE(answer->ToString(&sdp));
   const std::string kAudioMid = "a=mid:audio";
   const std::string kAudioMidReplaceStr = "a=mid:audio_content_name";
   rtc::replace_substrs(kAudioMid.c_str(), kAudioMid.length(),
                              kAudioMidReplaceStr.c_str(),
                              kAudioMidReplaceStr.length(),
                              &sdp);
   SessionDescriptionInterface* modified_answer1 =
       CreateSessionDescription(JsepSessionDescription::kAnswer, sdp, NULL);
-  SetRemoteDescriptionAnswerExpectError(kMlineMismatch, modified_answer1);
+  SetRemoteDescriptionAnswerExpectError(kMlineMismatchInAnswer,
+                                        modified_answer1);
 
   // Different media types.
   EXPECT_TRUE(answer->ToString(&sdp));
   const std::string kAudioMline = "m=audio";
   const std::string kAudioMlineReplaceStr = "m=video";
   rtc::replace_substrs(kAudioMline.c_str(), kAudioMline.length(),
                              kAudioMlineReplaceStr.c_str(),
                              kAudioMlineReplaceStr.length(),
                              &sdp);
   SessionDescriptionInterface* modified_answer2 =
       CreateSessionDescription(JsepSessionDescription::kAnswer, sdp, NULL);
-  SetRemoteDescriptionAnswerExpectError(kMlineMismatch, modified_answer2);
+  SetRemoteDescriptionAnswerExpectError(kMlineMismatchInAnswer,
+                                        modified_answer2);
 
   SetRemoteDescriptionWithoutError(answer.release());
 }
 
 // Verifying remote offer and local answer have matching m-lines as per
 // RFC 3264.
 TEST_F(WebRtcSessionTest, TestIncorrectMLinesInLocalAnswer) {
   Init();
   SendAudioVideoStream1();
   SessionDescriptionInterface* offer = CreateRemoteOffer();
   SetRemoteDescriptionWithoutError(offer);
   SessionDescriptionInterface* answer = CreateAnswer();
 
   cricket::SessionDescription* answer_copy = answer->description()->Copy();
   answer_copy->RemoveContentByName("video");
   JsepSessionDescription* modified_answer =
       new JsepSessionDescription(JsepSessionDescription::kAnswer);
 
   EXPECT_TRUE(modified_answer->Initialize(answer_copy,
                                           answer->session_id(),
                                           answer->session_version()));
-  SetLocalDescriptionAnswerExpectError(kMlineMismatch, modified_answer);
+  SetLocalDescriptionAnswerExpectError(kMlineMismatchInAnswer, modified_answer);
   SetLocalDescriptionWithoutError(answer);
 }
 
 // This test verifies that WebRtcSession does not start candidate allocation
 // before SetLocalDescription is called.
 TEST_F(WebRtcSessionTest, TestIceStartAfterSetLocalDescriptionOnly) {
   Init();
   SendAudioVideoStream1();
   SessionDescriptionInterface* offer = CreateRemoteOffer();
   cricket::Candidate candidate;
@@ skipping 761 matching lines @@
 }
 
 // TODO(bemasc): Add a TestIceStatesBundle with BUNDLE enabled.  That test
 // currently fails because upon disconnection and reconnection OnIceComplete is
 // called more than once without returning to IceGatheringGathering.
 
 INSTANTIATE_TEST_CASE_P(WebRtcSessionTests,
                         WebRtcSessionTest,
                         testing::Values(ALREADY_GENERATED,
                                         DTLS_IDENTITY_STORE));