(C++) TestingThread

 

This (sketch of an) article displays how to convert a non-threaded test (that is, the program waits for all the tests to have finished) to a threaded test (that is, the program starts while performing the tests in the background).

 

• Download the Qt Creator project 'CppTestingThread' (zip)

 

 

 

 

 

 

Technical facts

 

Application type(s)

• Desktop application

Operating system(s) or programming environment(s)

• Lubuntu 12.10 (quantal)

IDE(s):

• Qt Creator 2.5.2

Project type:

• Console application

C++ standard:

• C++11

Compiler(s):

• G++ 4.7.2

Libraries used:

• STL: GNU ISO C++ Library, version 4.7.2

 

 

 

 

 

Qt project file: CppTestingThread.pro

 

---

TEMPLATE = app CONFIG += console CONFIG -= qt QMAKE_CXXFLAGS += -std=c++11 LIBS += -lpthread SOURCES += main.cpp

 

 

 

 

 

main.cpp

 

With threading:

 

---

#include <algorithm> #include <cassert> #include <chrono> #include <future> #include <iostream> #include <vector> void LongTest() {   std::vector<int> v;   const int n = 10000; //Increase n if test takes too short   for (int i=0; i!=n; ++i)   {     v.push_back(i);   }   for (int i=0; i!=n; ++i)   {     std::random_shuffle(v.begin(),v.end());     std::sort(v.begin(),v.end());   } } struct Sub1 {   Sub1() { Test(); }   static void Test()   {     {       static bool is_tested = false;       if (is_tested) return;       is_tested = true;     }     std::thread t(LongTest);     std::clog << "Testing Sub1\n";     t.join();     //assert(!"SUB1 FAILS HERE!");   } }; struct Sub2 {   Sub2() { Test(); }   static void Test()   {     {       static bool is_tested = false;       if (is_tested) return;       is_tested = true;     }     std::thread t(LongTest);     std::clog << "Testing Sub2\n";     t.join();     //assert(!"SUB2 FAILS HERE!");   } }; struct Main {   Main()   {     Test();     Sub1 x;     Sub2 y;   }   static void Test()   {     {       static bool is_tested = false;       if (is_tested) return;       is_tested = true;     }     Sub1();     Sub2();     std::thread t(LongTest);     std::clog << "Testing Main\n";     t.join();     //assert(!"MAIN FAILS HERE!");   } }; int main() {   std::thread test(Main::Test);   std::clog << "Start running the program\n";   Main x;   std::clog << "Done\n";   test.detach(); }

 

Without threading:

 

---

#include <algorithm> #include <cassert> #include <future> #include <iostream> #include <vector> void LongTest() {   std::vector<int> v;   const int n = 10000; //Increase n if test takes too short   for (int i=0; i!=n; ++i)   {     v.push_back(i);   }   for (int i=0; i!=n; ++i)   {     std::random_shuffle(v.begin(),v.end());     std::sort(v.begin(),v.end());   } } struct Sub1 {   Sub1() { Test(); }   static void Test()   {     {       static bool is_tested = false;       if (is_tested) return;       is_tested = true;     }     std::clog << "Testing Sub1\n";     LongTest();   } }; struct Sub2 {   Sub2() { Test(); }   static void Test()   {     {       static bool is_tested = false;       if (is_tested) return;       is_tested = true;     }     std::clog << "Testing Sub2\n";     LongTest();   } }; struct Main {   Main()   {     Test();   }   static void Test()   {     {       static bool is_tested = false;       if (is_tested) return;       is_tested = true;     }     Sub1();     Sub2();     std::clog << "Testing Main\n";     LongTest();   } }; int main() {   Main x;   std::clog << "Start:\n";   std::string s;   std::cin >> s; }