/**
 * string-reverse-utests: Unit tests of string-reverse.
 */

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

#include <stdio.h>		// For printf
#include <string.h>		// For strcpy

#include "string-utils.h"	// For string_reverse
#include "utest.h"		// For CHECK_STRING


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

/**
 * Check whether reverse works on a copy of str.  Used because
 * string_reverse mutates the string, so we need to make sure that
 * we have a mutable string.  Also does two tests: (1) is the value
 * returned the reverse; (2) did we actually reverse the underlying
 * string.
 */
void
test_reverse (char *str, char *expected)
{
  char data[1+strlen(str)];
  strcpy (data, str);
  CHECK_STR (string_reverse (data), expected);
  CHECK_STR (data, expected);
} // test_reverse


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

int
main ()
{
  // A few simple strings
  test_reverse ("abcde", "edcba");
  test_reverse ("madam im adam", "mada mi madam");
  
  // A variety of sizes.  (reverse might have problems on some sizes).
  // Note: These should be generated automatically, but I'm lazy.
  test_reverse ("", "");
  test_reverse ("z", "z");
  test_reverse ("yz", "zy");
  test_reverse ("xyz", "zyx");
  test_reverse ("wxyz", "zyxw");
  test_reverse ("vwxyz", "zyxwv");
  test_reverse ("uvwxyz", "zyxwvu");
  test_reverse ("tuvwxyz", "zyxwvut");
  test_reverse ("stuvwxyz", "zyxwvuts");
  test_reverse ("rstuvwxyz", "zyxwvutsr");

  if (! errors)
    printf ("All tests passed!\n");
  else
    printf ("%d errors encountered\n", errors);

  return errors;
} // main