UnitTestExample.cpp

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#include "ElementsExamples/UnitTestExample.h"
 
#include <algorithm>  // sort
#include <numeric>    // accumulate
#include <vector>     // vector
 
#include "ElementsKernel/Exception.h"
 
using std::vector;
 
namespace Elements {
namespace Examples {
 
double UnitTestExample::average(const vector<int>& v) {
 
  double result = 0.0;
  auto   size   = v.size();
  // Throw an exception if the number of vector elements is null!
  if (size == 0) {
    throw Exception() << "Input vector has no element!";  // can be removed to feed a unit test exercise
  }
 
  // We check if we have enough numbers to compute the median
  // if (size - 5 > 0) { // example mistake to feed a unit test exercise
  if (size > 5) {
    //
    vector<int> ordered{v.begin(), v.end()};
    std::sort(ordered.begin(), ordered.end());
    if (size % 2 == 0) {
      result = (ordered[size / 2 - 1] + ordered[size / 2]) / 2.;
    } else {
      result = ordered[size / 2];
    }
 
  } else {
    // If we have less than 5 numbers we compute the mean
    // auto sum = std::accumulate(v.begin(), v.end(), 0);  // example mistake to feed a unit test exercise
    auto sum = std::accumulate(v.begin(), v.end(), 0.);  // example mistake to feed a unit test exercise
 
    result = static_cast<double>(sum) / static_cast<double>(size);
  }
 
  return result;
}
 
}  // namespace Examples
}  // namespace Elements