test/mjsunit/mod.js

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function foo() {
  for (var i = 1; i < 100; i++) {
    var answer = 1;
    for (var j = 1; j < 100; j++) {
      if (answer == i) answer = 0;
      // Positive case.
      print(j + " % " + i + " = " + answer);
      m = j % i;
      assertEquals(answer, m, j + " % " + i);
      m = j % (-i);
      assertEquals(answer, m, j + " % -" + i);
      // Negative case.
      m = (-j) % i;
      assertEquals(-answer, m, j + " % " + i);
      // Check for negative zero.
      if (answer == 0) assertEquals(-Infinity, 1/m);
      m = (-j) % (-i);
      assertEquals(-answer, m, j + " % -" + i);
      // Check for negative zero.
      if (answer == 0) assertEquals(-Infinity, 1/m);
      answer++;
    }
  }
}

foo();