src/third_party/v8/test/mjsunit/for-in-delete.js

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// Test that properties deleted during a for-in iteration do not show up in
// the for-in.

function f(o, expected, del) {
  var index = 0;
  for (p in o) {
    if (del) delete o[del];
    assertEquals(expected[index], p);
    index++;
  }
  assertEquals(expected.length, index);
}

var o = {}
o.a = 1;
o.b = 2;
o.c = 3;
o.d = 3;

f(o, ['a', 'b', 'c', 'd']);
f(o, ['a', 'b', 'c', 'd']);
f(o, ['a', 'c', 'd'], 'b');
f(o, ['a', 'c'], 'd');