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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /js/src/tests/non262/Array/from_errors.js | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | js/src/tests/non262/Array/from_errors.js | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/js/src/tests/non262/Array/from_errors.js b/js/src/tests/non262/Array/from_errors.js new file mode 100644 index 0000000000..cbf0eb195a --- /dev/null +++ b/js/src/tests/non262/Array/from_errors.js @@ -0,0 +1,152 @@ +/* Any copyright is dedicated to the Public Domain. + * http://creativecommons.org/licenses/publicdomain/ */ + +// Array.from throws if the argument is undefined or null. +assertThrowsInstanceOf(() => Array.from(), TypeError); +assertThrowsInstanceOf(() => Array.from(undefined), TypeError); +assertThrowsInstanceOf(() => Array.from(null), TypeError); + +// Array.from throws if an element can't be defined on the new object. +function ObjectWithReadOnlyElement() { + Object.defineProperty(this, "0", {value: null}); + this.length = 0; +} +ObjectWithReadOnlyElement.from = Array.from; +assertDeepEq(ObjectWithReadOnlyElement.from([]), new ObjectWithReadOnlyElement); +assertThrowsInstanceOf(() => ObjectWithReadOnlyElement.from([1]), TypeError); + +// The same, but via preventExtensions. +function InextensibleObject() { + Object.preventExtensions(this); +} +InextensibleObject.from = Array.from; +assertThrowsInstanceOf(() => InextensibleObject.from([1]), TypeError); + +// We will now test this property, that Array.from throws if the .length can't +// be assigned, using several different kinds of object. +var obj; +function init(self) { + obj = self; + self[0] = self[1] = self[2] = self[3] = 0; +} + +function testUnsettableLength(C, Exc) { + if (Exc === undefined) + Exc = TypeError; // the usual expected exception type + C.from = Array.from; + + obj = null; + assertThrowsInstanceOf(() => C.from([]), Exc); + assertEq(obj instanceof C, true); + for (var i = 0; i < 4; i++) + assertEq(obj[0], 0); + + obj = null; + assertThrowsInstanceOf(() => C.from([0, 10, 20, 30]), Exc); + assertEq(obj instanceof C, true); + for (var i = 0; i < 4; i++) + assertEq(obj[i], i * 10); +} + +// Array.from throws if the new object's .length can't be assigned because +// there is no .length and the object is inextensible. +function InextensibleObject4() { + init(this); + Object.preventExtensions(this); +} +testUnsettableLength(InextensibleObject4); + +// Array.from throws if the new object's .length can't be assigned because it's +// read-only. +function ObjectWithReadOnlyLength() { + init(this); + Object.defineProperty(this, "length", {configurable: true, writable: false, value: 4}); +} +testUnsettableLength(ObjectWithReadOnlyLength); + +// The same, but using a builtin type. +Uint8Array.from = Array.from; +assertThrowsInstanceOf(() => Uint8Array.from([]), TypeError); + +// Array.from throws if the new object's .length can't be assigned because it +// inherits a readonly .length along the prototype chain. +function ObjectWithInheritedReadOnlyLength() { + init(this); +} +Object.defineProperty(ObjectWithInheritedReadOnlyLength.prototype, + "length", + {configurable: true, writable: false, value: 4}); +testUnsettableLength(ObjectWithInheritedReadOnlyLength); + +// The same, but using an object with a .length getter but no setter. +function ObjectWithGetterOnlyLength() { + init(this); + Object.defineProperty(this, "length", {configurable: true, get: () => 4}); +} +testUnsettableLength(ObjectWithGetterOnlyLength); + +// The same, but with a setter that throws. +function ObjectWithThrowingLengthSetter() { + init(this); + Object.defineProperty(this, "length", { + configurable: true, + get: () => 4, + set: () => { throw new RangeError("surprise!"); } + }); +} +testUnsettableLength(ObjectWithThrowingLengthSetter, RangeError); + +// Array.from throws if mapfn is neither callable nor undefined. +assertThrowsInstanceOf(() => Array.from([3, 4, 5], {}), TypeError); +assertThrowsInstanceOf(() => Array.from([3, 4, 5], "also not a function"), TypeError); +assertThrowsInstanceOf(() => Array.from([3, 4, 5], null), TypeError); + +// Even if the function would not have been called. +assertThrowsInstanceOf(() => Array.from([], JSON), TypeError); + +// If mapfn is not undefined and not callable, the error happens before anything else. +// Before calling the constructor, before touching the arrayLike. +var log = ""; +function C() { + log += "C"; + obj = this; +} +var p = new Proxy({}, { + has: function () { log += "1"; }, + get: function () { log += "2"; }, + getOwnPropertyDescriptor: function () { log += "3"; } +}); +assertThrowsInstanceOf(() => Array.from.call(C, p, {}), TypeError); +assertEq(log, ""); + +// If mapfn throws, the new object has already been created. +var arrayish = { + get length() { log += "l"; return 1; }, + get 0() { log += "0"; return "q"; } +}; +log = ""; +var exc = {surprise: "ponies"}; +assertThrowsValue(() => Array.from.call(C, arrayish, () => { throw exc; }), exc); +assertEq(log, "lC0"); +assertEq(obj instanceof C, true); + +// It's a TypeError if the @@iterator property is a primitive (except null and undefined). +for (var primitive of ["foo", 17, Symbol(), true]) { + assertThrowsInstanceOf(() => Array.from({[Symbol.iterator] : primitive}), TypeError); +} +assertDeepEq(Array.from({[Symbol.iterator]: null}), []); +assertDeepEq(Array.from({[Symbol.iterator]: undefined}), []); + +// It's a TypeError if the iterator's .next() method returns a primitive. +for (var primitive of [undefined, null, 17]) { + assertThrowsInstanceOf( + () => Array.from({ + [Symbol.iterator]() { + return {next() { return primitive; }}; + } + }), + TypeError); +} + +if (typeof reportCompare === 'function') + reportCompare(0, 0); |