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// META: title=FormData: changes to entry list during iteration
// These are tests for next()'s behavior as specified in
// https://webidl.spec.whatwg.org/#es-iterator-prototype-object
"use strict";
function createFormData(input) {
const formData = new FormData();
for (const [name, value] of input) {
formData.append(name, value);
}
return formData;
}
test(() => {
const formData = createFormData([["foo", "0"],
["baz", "1"],
["BAR", "2"]]);
const actualKeys = [];
const actualValues = [];
for (const [name, value] of formData) {
actualKeys.push(name);
actualValues.push(value);
formData.delete("baz");
}
assert_array_equals(actualKeys, ["foo", "BAR"]);
assert_array_equals(actualValues, ["0", "2"]);
}, "Iteration skips elements removed while iterating");
test(() => {
const formData = createFormData([["foo", "0"],
["baz", "1"],
["BAR", "2"],
["quux", "3"]]);
const actualKeys = [];
const actualValues = [];
for (const [name, value] of formData) {
actualKeys.push(name);
actualValues.push(value);
if (name === "baz")
formData.delete("foo");
}
assert_array_equals(actualKeys, ["foo", "baz", "quux"]);
assert_array_equals(actualValues, ["0", "1", "3"]);
}, "Removing elements already iterated over causes an element to be skipped during iteration");
test(() => {
const formData = createFormData([["foo", "0"],
["baz", "1"],
["BAR", "2"],
["quux", "3"]]);
const actualKeys = [];
const actualValues = [];
for (const [name, value] of formData) {
actualKeys.push(name);
actualValues.push(value);
if (name === "baz")
formData.append("X-yZ", "4");
}
assert_array_equals(actualKeys, ["foo", "baz", "BAR", "quux", "X-yZ"]);
assert_array_equals(actualValues, ["0", "1", "2", "3", "4"]);
}, "Appending a value pair during iteration causes it to be reached during iteration");
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