/**
 * avetestc.c - An non-interactive unit test of the average procedure.
 */

// +---------+--------------------------------------------------------
// | Headers |
// +---------+

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

#include "average.h"

// +---------+--------------------------------------------------------
// | Globals |
// +---------+

int errors = 0;  // The count of errors


// +---------+--------------------------------------------------------
// | Helpers |
// +---------+

/**
 * Procedure:
 *   report
 * Parameters
 *   values, an array of integers
 *   count, an integer
 *   expected, an integer
 * Purpose:
 *   Check if we get a result we expect.
 * Produces:
 *   [Nothing; Called for the side effect.]
 * Pre: 
 *   values[] contains at least count values
 *   count > 0
 */
void
report (int values[], int count, int expected)
{
  int i;
  int ave = average (values, count);

  if (ave != expected)
    {
      ++errors;
      printf ("For average ({%d", values[0]);
      for (i = 1; i < count; i++)
        {
          printf (",%d", values[i]);
        } // for
      printf ("}), expected %d, got %d.\n", expected, ave);
    }
} // report


// +------+-----------------------------------------------------------
// | Main |
// +------+

int
main ()
{
  int i;
  int values0[] = { 1, 2, 3, 4, 5 };
  int values1[] = { -11 };
  int values2[] = { 0, 0, 0 };
  int values3[] = { 'a', 'c' };
  int values4[] = { INT_MAX, INT_MAX, INT_MAX, INT_MAX };

  // One simple test
  report (values0, 5, 3);
  report (values1, 1, -11);
  report (values2, 3, 0);
  report (values3, 1, 'a');
  report (values3, 2, 'b');

  for (i = 1; i <= 4; i++)
    report (values4, i, INT_MAX);

  // And we're done
  if (errors)
    printf ("%d tests failed.\n", errors);
  return errors;
} // main