<!DOCTYPE html>
<meta charset=utf-8>
<title>CharacterData.substringData</title>
<link rel=help href="https://dom.spec.whatwg.org/#dom-characterdata-substringdata">
<link rel=help href="https://dom.spec.whatwg.org/#dom-characterdata-data">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
function testNode(create, type) {
  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_throws(new TypeError(), function() { node.substringData() })
    assert_throws(new TypeError(), function() { node.substringData(0) })
  }, type + ".substringData() with too few arguments")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_equals(node.substringData(0, 1, "test"), "t")
  }, type + ".substringData() with too many arguments")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_throws("IndexSizeError", function() { node.substringData(5, 0) })
    assert_throws("IndexSizeError", function() { node.substringData(6, 0) })
    assert_throws("IndexSizeError", function() { node.substringData(-1, 0) })
  }, type + ".substringData() with invalid offset")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_equals(node.substringData(0, 1), "t")
    assert_equals(node.substringData(1, 1), "e")
    assert_equals(node.substringData(2, 1), "s")
    assert_equals(node.substringData(3, 1), "t")
    assert_equals(node.substringData(4, 1), "")
  }, type + ".substringData() with in-bounds offset")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_equals(node.substringData(0, 0), "")
    assert_equals(node.substringData(1, 0), "")
    assert_equals(node.substringData(2, 0), "")
    assert_equals(node.substringData(3, 0), "")
    assert_equals(node.substringData(4, 0), "")
  }, type + ".substringData() with zero count")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_equals(node.substringData(0x100000000 + 0, 1), "t")
    assert_equals(node.substringData(0x100000000 + 1, 1), "e")
    assert_equals(node.substringData(0x100000000 + 2, 1), "s")
    assert_equals(node.substringData(0x100000000 + 3, 1), "t")
    assert_equals(node.substringData(0x100000000 + 4, 1), "")
  }, type + ".substringData() with very large offset")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_equals(node.substringData(-0x100000000 + 2, 1), "s")
  }, type + ".substringData() with negative offset")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_equals(node.substringData("test", 3), "tes")
  }, type + ".substringData() with string offset")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_equals(node.substringData(0, 1), "t")
    assert_equals(node.substringData(0, 2), "te")
    assert_equals(node.substringData(0, 3), "tes")
    assert_equals(node.substringData(0, 4), "test")
  }, type + ".substringData() with in-bounds count")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_equals(node.substringData(0, 5), "test")
    assert_equals(node.substringData(2, 20), "st")
  }, type + ".substringData() with large count")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_equals(node.substringData(2, 0x100000000 + 1), "s")
  }, type + ".substringData() with very large count")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    assert_equals(node.substringData(0, -1), "test")
    assert_equals(node.substringData(0, -0x100000000 + 2), "te")
  }, type + ".substringData() with negative count")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    node.data = "This is the character data test, other 資料，更多文字"

    assert_equals(node.substringData(12, 4), "char")
    assert_equals(node.substringData(39, 2), "資料")
  }, type + ".substringData() with non-ASCII data")

  test(function() {
    var node = create()
    assert_equals(node.data, "test")

    node.data = "🌠 test 🌠 TEST"

    assert_equals(node.substringData(5, 8), "st 🌠 TE")  // Counting UTF-16 code units
  }, type + ".substringData() with non-BMP data")
}

testNode(function() { return document.createTextNode("test") }, "Text")
testNode(function() { return document.createComment("test") }, "Comment")
</script>