dcsctp: Re-add lost validating in test case

This was unintentionally removed in change
https://webrtc-review.googlesource.com/c/src/+/359681 due to a dirty
workspace.

Re-adding it.

Bug: None
Change-Id: Icff55b7a656ed9b504b0e10e7aeb947e8df78e85
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/360540
Auto-Submit: Victor Boivie <boivie@webrtc.org>
Commit-Queue: Florent Castelli <orphis@webrtc.org>
Reviewed-by: Florent Castelli <orphis@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#42846}
diff --git a/net/dcsctp/socket/dcsctp_socket_test.cc b/net/dcsctp/socket/dcsctp_socket_test.cc
index a9d424f..7266dc8 100644
--- a/net/dcsctp/socket/dcsctp_socket_test.cc
+++ b/net/dcsctp/socket/dcsctp_socket_test.cc
@@ -2835,6 +2835,20 @@
                                      kSuccessPerformed))))))));
   a.socket.ReceivePacket(reconfig3);
 
+  EXPECT_THAT(
+      data1,
+      HasChunks(ElementsAre(IsDataChunk(Property(&DataChunk::ssn, SSN(0))))));
+  EXPECT_THAT(
+      data2,
+      HasChunks(ElementsAre(IsDataChunk(Property(&DataChunk::ssn, SSN(0))))));
+  EXPECT_THAT(
+      data3,
+      HasChunks(ElementsAre(IsDataChunk(Property(&DataChunk::ssn, SSN(1))))));
+  EXPECT_THAT(reconfig, HasChunks(ElementsAre(IsReConfig(HasParameters(
+                            ElementsAre(IsOutgoingResetRequest(Property(
+                                &OutgoingSSNResetRequestParameter::stream_ids,
+                                ElementsAre(StreamID(1))))))))));
+
   // Send a new message after the stream has been reset.
   a.socket.Send(DcSctpMessage(StreamID(1), PPID(55),
                               std::vector<uint8_t>(kSmallMessageSize)),