Exclusive product, little test assignment on C++

exclusive_product.cpp

#include <iostream>
#include <numeric>
#include <vector>

/// @brief: Calculates array of same size, where each element is the product
/// of all elements excluding corresponding by index
/// Algorithm: O(n) time, O(n) space
/// @param: array of int
/// @return: array of same size
/// @example: {1,2,3,4} => {24, 12, 8, 6}, {1, 2, 3, 4, 5} => {120, 60, 40, 30, 24}
auto exclusive_product(const std::vector<int>& input_data) -> std::vector<int>
{
  int product = std::accumulate(std::begin(input_data), std::end(input_data), 1, std::multiplies<int>());
  std::vector<int> result;
  result.reserve(input_data.size());
  for (auto i : input_data) {
    if (i == 0) {
      result.push_back(0);
    } 
    else {
      result.push_back(product / i);
    }
  }
  return std::move(result);
}

/// @brief: Check if the result of `exclusive_product()` is correct
/// @param input_data: array of int
/// @param expected_data: what we expect to get from `exclusive_product()`
/// @return: true if result is correct, false otherwise
bool sum_product_test(const std::vector<int>& input_data, const std::vector<int>& expected_data)
{
  auto output_data = exclusive_product(input_data);
  return output_data == expected_data;
}

/// @brief: test function
void test_cases()
{
  static const std::vector<std::vector<int>> input_cases {
      {1, 2, 3, 4},
      {0, 0, 0, 0},
      {1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
      {}
  };

  static const std::vector<std::vector<int>> expected_cases {
      {24, 12, 8, 6},
      {0, 0, 0, 0},
      {3628800, 1814400, 1209600, 907200, 725760, 604800, 518400, 453600, 403200, 362880},
      {}
  };

  for (auto i = 0; i < input_cases.size(); ++i) {
    if (sum_product_test(input_cases[i], expected_cases[i])) {
        std::cout << "Test " << i << " passed" << std::endl;
    }
    else {
        std::cout << "Test " << i << " failed" << std::endl;
    }
  }
}

auto main() -> int
{
  std::cout << "Test assignment application\n";
  test_cases();
  return 0;
}