example-as-test.cc

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/*
 * Copyright (c) 2020 Lawrence Livermore National Laboratory
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author: Peter D. Barnes, Jr. <pdbarnes@llnl.gov>
 */
 
#include "example-as-test.h"
 
#include "ascii-test.h"
#include "assert.h"
#include "environment-variable.h"
#include "fatal-error.h"
#include "log.h"
 
#include <cstdlib> // itoa(), system ()
#include <cstring>
#include <sstream>
#include <string>
 
/**
 * \file
 * \ingroup testing
 * Implementation of classes ns3::ExampleAsTestSuite and ns3::ExampleTestCase.
 */
 
namespace ns3
{
 
NS_LOG_COMPONENT_DEFINE("ExampleAsTestCase");
 
// Running tests as examples currently requires Python.
 
ExampleAsTestCase::ExampleAsTestCase(const std::string name,
                                     const std::string program,
                                     const std::string dataDir,
                                     const std::string args /* = "" */,
                                     const bool shouldNotErr /* = true */)
    : TestCase(name),
      m_program(program),
      m_dataDir(dataDir),
      m_args(args),
      m_shouldNotErr(shouldNotErr)
{
    NS_LOG_FUNCTION(this << name << program << dataDir << args);
}
 
ExampleAsTestCase::~ExampleAsTestCase()
{
    NS_LOG_FUNCTION_NOARGS();
}
 
std::string
ExampleAsTestCase::GetCommandTemplate() const
{
    NS_LOG_FUNCTION_NOARGS();
    std::string command("%s ");
    command += m_args;
    return command;
}
 
std::string
ExampleAsTestCase::GetPostProcessingCommand() const
{
    NS_LOG_FUNCTION_NOARGS();
    std::string command("");
    return command;
}
 
void
ExampleAsTestCase::DoRun()
{
    NS_LOG_FUNCTION_NOARGS();
    // Set up the output file names
    SetDataDir(m_dataDir);
    std::string refFile = CreateDataDirFilename(GetName() + ".reflog");
    std::string testFile = CreateTempDirFilename(GetName() + ".reflog");
    std::string post = GetPostProcessingCommand();
 
    if (!m_shouldNotErr)
    {
        // Strip any system- or compiler-dependent messages
        // resulting from invoking NS_FATAL..., which in turn
        // calls std::terminate
        post += " | sed '1,/" + std::string(NS_FATAL_MSG) + "/!d' ";
    }
 
    std::stringstream ss;
 
    ss << "python3 ./ns3 run " << m_program << " --no-build --command-template=\""
       << GetCommandTemplate() << "\"";
 
    if (post.empty())
    {
        // redirect to testfile, then std::clog, std::cerr to std::cout
        ss << " > " << testFile << " 2>&1";
    }
    else
    {
        ss << " 2>&1 " << post << " > " << testFile;
    }
 
    int status = std::system(ss.str().c_str());
 
    std::cout << "\n"
              << GetName() << ":\n"
              << "    command:  " << ss.str() << "\n"
              << "    status:   " << status << "\n"
              << "    refFile:  " << refFile << "\n"
              << "    testFile: " << testFile << "\n"
              << "    testFile contents:" << std::endl;
 
    std::ifstream logF(testFile);
    std::string line;
    while (getline(logF, line))
    {
        std::cout << "--- " << line << "\n";
    }
    logF.close();
 
    if (m_shouldNotErr)
    {
        // Make sure the example didn't outright crash
        NS_TEST_ASSERT_MSG_EQ(status, 0, "example " + m_program + " failed");
    }
 
    // If we're just introspecting the command-line
    // we've run the example and we're done
    auto [found, intro] = EnvironmentVariable::Get("NS_COMMANDLINE_INTROSPECTION");
    if (found)
    {
        return;
    }
 
    // Compare the testFile to the reference file
    NS_ASCII_TEST_EXPECT_EQ(testFile, refFile);
}
 
ExampleAsTestSuite::ExampleAsTestSuite(const std::string name,
                                       const std::string program,
                                       const std::string dataDir,
                                       const std::string args /* = "" */,
                                       const Duration duration /* =QUICK */,
                                       const bool shouldNotErr /* = true */)
    : TestSuite(name, Type::EXAMPLE)
{
    NS_LOG_FUNCTION(this << name << program << dataDir << args << duration << shouldNotErr);
    AddTestCase(new ExampleAsTestCase(name, program, dataDir, args, shouldNotErr), duration);
}
 
} // namespace ns3