JSTests/stress/string-code-point-at-surrogate-pair.js

function shouldBe(actual, expected) {
    if (actual !== expected)
        throw new Error(`bad value: ${actual}, expected ${expected}`);
}

function testSurrogatePair(testString, expected) {
    for (var i = 0; i < testString.length; ++i)
        shouldBe(testString.codePointAt(i), expected[i]);
}
noInline(testSurrogatePair);

// "\uD842\uDFB7\u91ce\u5bb6"
var testString = "𠮷野家";
var expected = [
    0x20BB7,
    0xDFB7,
    0x91CE,
    0x5BB6,
];
for (var i = 0; i < 1e5; ++i)
    testSurrogatePair(testString, expected);

var testString = "A\uD842";
var expected = [
    0x0041,
    0xD842,
];
for (var i = 0; i < 1e5; ++i)
    testSurrogatePair(testString, expected);

var testString = "A\uD842A";
var expected = [
    0x0041,
    0xD842,
    0x0041,
];
for (var i = 0; i < 1e5; ++i)
    testSurrogatePair(testString, expected);

var testString = "A\uD842\uDFB7";
var expected = [
    0x0041,
    0x20BB7,
    0xDFB7,
];
for (var i = 0; i < 1e5; ++i)
    testSurrogatePair(testString, expected);

var testString = "\uD842A\uDFB7";
var expected = [
    0xD842,
    0x0041,
    0xDFB7,
];
for (var i = 0; i < 1e5; ++i)
    testSurrogatePair(testString, expected);

var testString = "\uDFB7\uD842A";
var expected = [
    0xDFB7,
    0xD842,
    0x0041,
];
for (var i = 0; i < 1e5; ++i)
    testSurrogatePair(testString, expected);