test/mjsunit/compare-nan.js

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var a = [NaN, -1, 0, 1, 1.2, -7.9, true, false, 'foo', '0', 'NaN' ];
for (var i in a) {
  var x = a[i];
  assertFalse(NaN == x, "NaN == " + x);
  assertFalse(NaN === x, "NaN === " + x);
  assertFalse(NaN < x, "NaN < " + x);
  assertFalse(NaN > x, "NaN > " + x);
  assertFalse(NaN <= x, "NaN <= " + x);
  assertFalse(NaN >= x, "NaN >= " + x);

  assertFalse(x == NaN, "" + x + " == NaN");
  assertFalse(x === NaN, "" + x + " === NaN");
  assertFalse(x < NaN, "" + x + " < NaN");
  assertFalse(x > NaN, "" + x + " > NaN");
  assertFalse(x <= NaN, "" + x + " <= NaN");
  assertFalse(x >= NaN, "" + x + " >= NaN");
}