v8/test/mjsunit/object-is.js

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// Test both the Harmony egal operator and it's function equivalent.

function TestEgal(expected, x, y) {
  // TODO(mstarzinger): Once we have the egal operator, we can test it here.
  assertSame(expected, Object.is(x, y));
}

var test_set = [ {}, [], Infinity, -Infinity, "s", "ア", 0, 0/-1, null,
    undefined, true, false, Symbol("foo"), NaN ];
for (var i = 0; i < test_set.length; i++) {
  for (var j = 0; j < test_set.length; j++) {
    if (i == j) {
      assertSame(test_set[i], test_set[j]);
      TestEgal(true, test_set[i], test_set[j]);
    } else {
      TestEgal(false, test_set[i], test_set[j]);
      TestEgal(false, test_set[j], test_set[i]);
    }
  }
}