drop-tail-queue-test-suite.cc

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/*
 * Copyright (c) 2007 University of Washington
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
#include "ns3/drop-tail-queue.h"
#include "ns3/string.h"
#include "ns3/test.h"
 
using namespace ns3;
 
class DropTailQueueTestCase : public TestCase
{
  public:
    DropTailQueueTestCase();
    void DoRun() override;
};
 
DropTailQueueTestCase::DropTailQueueTestCase()
    : TestCase("Sanity check on the drop tail queue implementation")
{
}
 
void
DropTailQueueTestCase::DoRun()
{
    Ptr<DropTailQueue<Packet>> queue = CreateObject<DropTailQueue<Packet>>();
    NS_TEST_EXPECT_MSG_EQ(queue->SetAttributeFailSafe("MaxSize", StringValue("3p")),
                          true,
                          "Verify that we can actually set the attribute");
 
    Ptr<Packet> p1;
    Ptr<Packet> p2;
    Ptr<Packet> p3;
    Ptr<Packet> p4;
    p1 = Create<Packet>();
    p2 = Create<Packet>();
    p3 = Create<Packet>();
    p4 = Create<Packet>();
 
    NS_TEST_EXPECT_MSG_EQ(queue->GetNPackets(), 0, "There should be no packets in there");
    queue->Enqueue(p1);
    NS_TEST_EXPECT_MSG_EQ(queue->GetNPackets(), 1, "There should be one packet in there");
    queue->Enqueue(p2);
    NS_TEST_EXPECT_MSG_EQ(queue->GetNPackets(), 2, "There should be two packets in there");
    queue->Enqueue(p3);
    NS_TEST_EXPECT_MSG_EQ(queue->GetNPackets(), 3, "There should be three packets in there");
    queue->Enqueue(p4); // will be dropped
    NS_TEST_EXPECT_MSG_EQ(queue->GetNPackets(), 3, "There should be still three packets in there");
 
    Ptr<Packet> packet;
 
    packet = queue->Dequeue();
    NS_TEST_EXPECT_MSG_NE(packet, nullptr, "I want to remove the first packet");
    NS_TEST_EXPECT_MSG_EQ(queue->GetNPackets(), 2, "There should be two packets in there");
    NS_TEST_EXPECT_MSG_EQ(packet->GetUid(), p1->GetUid(), "was this the first packet ?");
 
    packet = queue->Dequeue();
    NS_TEST_EXPECT_MSG_NE(packet, nullptr, "I want to remove the second packet");
    NS_TEST_EXPECT_MSG_EQ(queue->GetNPackets(), 1, "There should be one packet in there");
    NS_TEST_EXPECT_MSG_EQ(packet->GetUid(), p2->GetUid(), "Was this the second packet ?");
 
    packet = queue->Dequeue();
    NS_TEST_EXPECT_MSG_NE(packet, nullptr, "I want to remove the third packet");
    NS_TEST_EXPECT_MSG_EQ(queue->GetNPackets(), 0, "There should be no packets in there");
    NS_TEST_EXPECT_MSG_EQ(packet->GetUid(), p3->GetUid(), "Was this the third packet ?");
 
    packet = queue->Dequeue();
    NS_TEST_EXPECT_MSG_EQ(packet, nullptr, "There are really no packets in there");
}
 
class DropTailQueueTestSuite : public TestSuite
{
  public:
    DropTailQueueTestSuite()
        : TestSuite("drop-tail-queue", UNIT)
    {
        AddTestCase(new DropTailQueueTestCase(), TestCase::QUICK);
    }
};
 
static DropTailQueueTestSuite g_dropTailQueueTestSuite;