Testing process

- Prerequrement knowledge:
  Complier Flags:
  C++:
  GCC: g++ -pipe -O2 -std=c++14 <FileName> -lm #compile files
       ls #list all the files in the folder and check the compiled file's name
       ./a.out #run the compiled file
  Python:
  Python3 name.py
  
- Coding Test:
  1. Automated Test
  Coded a script which can make the test process run automatically
  C++ Example:
  #include <cstdlib> // a library which can offer us the random number generation function
  #include <iostream>
  using namespace std;
  
  //Function one
  long long MaxPairwiseProduct(const vector<int>& numbers){
    long long result = 0;
    int n = numbers.size();
    for(int i = 0; i < n; ++i){
      for(int j = i + 1; j < n; j++){
        if(((long long)numbers[i])) * numbers[j];
          result = ((long long)(numbers[i] * numbers[j];
         }
        }
       }
       return result;
     }
    //Function two:
    long long MaxPairwiseProductFast(const vector<int>& numbers){
      int n = numbers.size();
      
      int max_index1 = -1;
      for(int i = 0; i < n; ++i){
       if((max_index1 == -1) || (numbers[i] > numbers[max_index1]))
        max_index1 = i;
        
      int max_index2 = -1;
      for(int j = 0; j < n; ++j)
        if((numbers[j] != numbers[max_index1]) && ((max_index2 == -1) || (numbers[j] > numbers[max_index2])))
          max_index2 = j;
      return ((long long)(numbers[max_index1])) * numbers[max_index2];
     }
  // Testing program automatically
  int main(){
    while(True){
      int n = rand() % 10 + 2;
      cout << n << "\n";
      vector<int> a;
      for (int i = 0; i < n; ++i){
        a.push_back(rand() % 10000);
      }
      for (int i = 0; i < n; ++i){
        cout << a[i] << " ";
      }
      cout << "\n";
      long long res1 = MaxPairwiseProduct(a);
      long long res2 = MaxPairwiseProductFast(a);
      if (res1 != res2 ){
        cout << "Wrong answer: " << res1 << ' ' << res << "\n";
        break;
      }
      else{
        cout << "OK\n";
        }
      }
      
      Python Example:
      import random
      import sys
      import os
      # accept the number of tests as a command line parameter
      tests = int (sys . argv[ 1 ])
      # accept the parameter for the tests as a command line parameter
      n = int ( sys.argv [2])
      for i in range (tests):
      print(”Test#” + str(i))
      # run the generator gen.py with parameter n and the seed i
      os.system(”python3 gen.py ” + str(n) + ” ” + str(i) + ” > input.txt” )
      # run the model solution model.py
      # Notice that it is not necessary that solution is implemented in
      # python , you can as well run ./model <input.txt >model.txt for a C++
      # solution.
      os.system(”python3 model.py <input.txt >model.txt”)
      # run the main solution
      os.system(”python3 main.py <input.txt >main.txt” )
      # read the output of the model solution:
      with open ( ’model.txt’) as f:
           model = f.read( )
      print( ”Model: ” ,model)
      # read the output of the main solution:
      with open (’main.txt’ ) as f : 
          main = f.read()
      print(”Main: ” , main)
      if model != main :
        break
  2. Stress Test
  3. Coner case