test/script/basic/JDK-8171219.js

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/**
 * JDK-8171219: Missing checks in sparse array shift() implementation
 *
 * @test
 * @run
 */

var a = [];
a[1048577] = 1;
a.shift();
a[1] = 2;
a.shift();
var ka = Object.keys(a);
Assert.assertTrue(ka.length === 2);
Assert.assertTrue(ka[0] === '0');
Assert.assertTrue(ka[1] === '1048575');
Assert.assertTrue(a.length === 1048576);
Assert.assertTrue(a[0] === 2);
Assert.assertTrue(a[1048575] = 1);

var b = [];
b[1048577] = 1;
b.unshift(2);
b.shift();
b[1] = 3;
b.shift();
var kb = Object.keys(b);
Assert.assertTrue(kb.length === 2);
Assert.assertTrue(kb[0] === '0');
Assert.assertTrue(kb[1] === '1048576');
Assert.assertTrue(b.length === 1048577);
Assert.assertTrue(b[0] === 3);
Assert.assertTrue(b[1048576] = 1);