Reland of Moving MediaStreamSignaling logic into PeerConnection.

talk/app/webrtc/datachannel_unittest.cc

Index: talk/app/webrtc/datachannel_unittest.cc
diff --git a/talk/app/webrtc/datachannel_unittest.cc b/talk/app/webrtc/datachannel_unittest.cc
index b4f611e215854273839ebe6334ef9664ddaf2819..ff79541478926e11b4daa2ed14804ee42795f242 100644
--- a/talk/app/webrtc/datachannel_unittest.cc
+++ b/talk/app/webrtc/datachannel_unittest.cc
@@ -31,6 +31,7 @@
 #include "webrtc/base/gunit.h"
 
 using webrtc::DataChannel;
+using webrtc::SctpSidAllocator;
 
 class FakeDataChannelObserver : public webrtc::DataChannelObserver {
  public:
@@ -506,3 +507,75 @@ TEST_F(SctpDataChannelTest, NeverOpened) {
   webrtc_data_channel_->OnTransportChannelCreated();
   webrtc_data_channel_->Close();
 }
+
+class SctpSidAllocatorTest : public testing::Test {
+ protected:
+  SctpSidAllocator allocator_;
+};
+
+// Verifies that an even SCTP id is allocated for SSL_CLIENT and an odd id for
+// SSL_SERVER.
+TEST_F(SctpSidAllocatorTest, SctpIdAllocationBasedOnRole) {
+  int id;
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_SERVER, &id));
+  EXPECT_EQ(1, id);
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_CLIENT, &id));
+  EXPECT_EQ(0, id);
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_SERVER, &id));
+  EXPECT_EQ(3, id);
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_CLIENT, &id));
+  EXPECT_EQ(2, id);
+}
+
+// Verifies that SCTP ids of existing DataChannels are not reused.
+TEST_F(SctpSidAllocatorTest, SctpIdAllocationNoReuse) {
+  int old_id = 1;
+  EXPECT_TRUE(allocator_.ReserveSid(old_id));
+
+  int new_id;
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_SERVER, &new_id));
+  EXPECT_NE(old_id, new_id);
+
+  old_id = 0;
+  EXPECT_TRUE(allocator_.ReserveSid(old_id));
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_CLIENT, &new_id));
+  EXPECT_NE(old_id, new_id);
+}
+
+// Verifies that SCTP ids of removed DataChannels can be reused.
+TEST_F(SctpSidAllocatorTest, SctpIdReusedForRemovedDataChannel) {
+  int odd_id = 1;
+  int even_id = 0;
+  EXPECT_TRUE(allocator_.ReserveSid(odd_id));
+  EXPECT_TRUE(allocator_.ReserveSid(even_id));
+
+  int allocated_id = -1;
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_SERVER, &allocated_id));
+  EXPECT_EQ(odd_id + 2, allocated_id);
+
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_CLIENT, &allocated_id));
+  EXPECT_EQ(even_id + 2, allocated_id);
+
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_SERVER, &allocated_id));
+  EXPECT_EQ(odd_id + 4, allocated_id);
+
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_CLIENT, &allocated_id));
+  EXPECT_EQ(even_id + 4, allocated_id);
+
+  allocator_.ReleaseSid(odd_id);
+  allocator_.ReleaseSid(even_id);
+
+  // Verifies that removed ids are reused.
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_SERVER, &allocated_id));
+  EXPECT_EQ(odd_id, allocated_id);
+
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_CLIENT, &allocated_id));
+  EXPECT_EQ(even_id, allocated_id);
+
+  // Verifies that used higher ids are not reused.
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_SERVER, &allocated_id));
+  EXPECT_EQ(odd_id + 6, allocated_id);
+
+  EXPECT_TRUE(allocator_.AllocateSid(rtc::SSL_CLIENT, &allocated_id));
+  EXPECT_EQ(even_id + 6, allocated_id);
+}