TestSupport.cxx

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/// \file
/// \brief This file contains a specialised ROOT message handler to test for diagnostic in unit tests.
///
/// \author Stephan Hageboeck <stephan.hageboeck@cern.ch>
 
/*************************************************************************
 * Copyright (C) 1995-2021, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#include "ROOT/TestSupport.hxx"
 
#include "gtest/gtest.h"
 
#include <algorithm>
#include <cstring>
#include <iostream>
#include <iomanip>
 
namespace ROOT {
namespace TestSupport {
 
/// Error handler for gtests that generates failures for every received diagnostic > kInfo when this file is linked to.
static struct ForbidDiagnostics {
   ForbidDiagnostics() :
      sOldErrorHandler{ ::GetErrorHandler() } {
         SetErrorHandler(ForbidDiagnostics::handler);
      }
 
   ~ForbidDiagnostics() {
      ::SetErrorHandler(sOldErrorHandler);
   }
 
   /// Diagnostic handler that's installed for all google tests.
   /// It will generate a test failure when a diagnostic message is issued.
   static void handler(int level, bool abort,
         const char *location,
         const char *msg) {
      if (level <= gErrorIgnoreLevel) return;
      if (level <= kInfo) {
         std::cerr << "ROOT::TestSupport::ForbidDiagnostics::handler(): Diagnostic in '" << location << "':\n"
                   << msg << std::endl;
         return;
      }
 
      if (abort) {
         std::cerr << "ROOT::TestSupport::ForbidDiagnostics::handler(): Forced to abort because of diagnostic with severity "
            << level << " in '" << location << "' reading '" << msg << "'\n";
         ::abort();
      }
 
      // FIXME: Windows has problem finding PCMs.
      if (level == kError && strcmp(location, "TCling::LoadPCM") == 0 && strstr(msg, "file does not exist") != nullptr) {
        std::cerr << "Error in " << location << " " << msg << std::endl;
        return;
      }
 
      // FIXME: DOAS backend is experimental.
      if (level == kWarning
          && strstr(msg, "The DAOS backend is experimental and still under development") != nullptr) {
        std::cerr << "Warning in " << location << " " << msg << std::endl;
        return;
      }
 
      // FIXME: RooNaNPacker warns about not being implemented for big endian
      if (level == kWarning
     && strcmp(msg, "Fast recovery from undefined function values only implemented for little-endian machines. If necessary, request an extension of functionality on https://root.cern") == 0) {
        std::cerr << "Warning in " << location << " " << msg << std::endl;
        return;
      }
 
      if (level == kWarning && strcmp(location, "RIoUring") == 0 &&
          strstr(msg, "io_uring is not available because:") != nullptr) {
         std::cerr << "Warning in " << location << " " << msg << std::endl;
         return;
      }
 
      if (level == kWarning && strcmp(location, "RRawFileUnix") == 0 &&
          strcmp(msg, "io_uring setup failed, falling back to blocking I/O in ReadV") == 0) {
         std::cerr << "Warning in " << location << " " << msg << std::endl;
         return;
      }
 
      FAIL() << "Received unexpected diagnostic of severity "
         << level
         << " at '" << location << "' reading '" << msg << "'.\n"
         << "Suppress those using ROOT/TestSupport.hxx";
   }
 
   ErrorHandlerFunc_t const sOldErrorHandler;
} noDiagCheckerInstance;
 
 
CheckDiagsRAII * CheckDiagsRAII::sActiveInstance = nullptr;
 
CheckDiagsRAII::~CheckDiagsRAII() {
   sActiveInstance = fOldInstance;
   ::SetErrorHandler(fOldErrorHandler);
   gInterpreter->ReportDiagnosticsToErrorHandler(/*enable=*/false);
 
   for (const auto &diag : fExpectedDiags) {
      if (!diag.optional && diag.receivedCount < 1) {
         ADD_FAILURE() << "ROOT::TestSupport::CheckDiagsRAII: Expected diagnostic message missing:\n" << diag;
      }
   }
 
   for (const auto &diag : fUnexpectedDiags) {
      ADD_FAILURE() << "ROOT::TestSupport::CheckDiagsRAII: Unexpected diagnostic message:\n" << diag;
   }
}
 
/// Search list of expected diagnostics for given arguments, and increase the receivedCount.
/// If no matching predefined diagnostic is found, this will trigger an unexpected diagnostic error on exit.
void CheckDiagsRAII::checkDiag(int severity, const char * location, const char * msg) {
   // Check that this received diagnostics was expected
   const std::string message = msg;
   const auto expectedMatch =
      std::find_if(fExpectedDiags.begin(), fExpectedDiags.end(), [=](const Diag_t &expectedDiag) {
         return expectedDiag.severity == severity
         && strstr(location, expectedDiag.location.c_str()) != nullptr
         && (expectedDiag.matchFullString ? expectedDiag.message == message : (message.find(expectedDiag.message) != std::string::npos));
      });
 
   if (expectedMatch != fExpectedDiags.end()) {
      expectedMatch->receivedCount += 1;
   } else if (severity <= kInfo) {
      fOldErrorHandler(severity, false, location, msg);
   } else {
      fUnexpectedDiags.push_back({severity, location, std::move(message)});
   }
}
 
std::ostream &operator<<(std::ostream &stream, CheckDiagsRAII::Diag_t const &diag)
{
   std::map<int, std::string> dict = {
      {kInfo, "kInfo"}, {kWarning, "kWarning"}, {kError, "kError"}, {kSysError, "kSysError"}};
 
   constexpr auto indent = 15;
   stream << std::right << std::setw(indent) << "severity: " << dict[diag.severity];
   if (diag.receivedCount >= 0) {
      stream << "\n"
             << std::setw(indent) << "received: " << diag.receivedCount << " times ("
             << (diag.optional ? "optional" : "required") << ", " << (diag.matchFullString ? "fullMatch" : "subMatch")
             << ")\t";
   }
   stream << "\n"
          << std::setw(indent) << "origin: " << '"' << diag.location << "\""
          << "\n"
          << std::setw(indent) << "message: " << diag.message << "\n";
 
   return stream;
}
} } //ROOT::TestSupport