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File-constructor.html
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File-constructor.html
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<!DOCTYPE html>
<meta charset=utf-8>
<title>File constructor</title>
<link rel=help href="http://dev.w3.org/2006/webapi/FileAPI/#dfn-file">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
const to_string_obj = { toString: () => 'a string' };
const to_string_throws = { toString: () => { throw new Error('expected'); } };
test(function() {
assert_true("File" in window, "window should have a File property.");
}, "File interface object exists");
test(t => {
assert_throws_js(TypeError, () => new File(),
'Bits argument is required');
assert_throws_js(TypeError, () => new File([]),
'Name argument is required');
}, 'Required arguments');
function test_first_argument(arg1, expectedSize, testName) {
test(function() {
var file = new File(arg1, "dummy");
assert_true(file instanceof File);
assert_equals(file.name, "dummy");
assert_equals(file.size, expectedSize);
assert_equals(file.type, "");
// assert_false(file.isClosed); XXX: File.isClosed doesn't seem to be implemented
assert_not_equals(file.lastModified, "");
}, testName);
}
test_first_argument([], 0, "empty fileBits");
test_first_argument(["bits"], 4, "DOMString fileBits");
test_first_argument(["𝓽𝓮𝔁𝓽"], 16, "Unicode DOMString fileBits");
test_first_argument([new String('string object')], 13, "String object fileBits");
test_first_argument([new Blob()], 0, "Empty Blob fileBits");
test_first_argument([new Blob(["bits"])], 4, "Blob fileBits");
test_first_argument([new File([], 'world.txt')], 0, "Empty File fileBits");
test_first_argument([new File(["bits"], 'world.txt')], 4, "File fileBits");
test_first_argument([new ArrayBuffer(8)], 8, "ArrayBuffer fileBits");
test_first_argument([new Uint8Array([0x50, 0x41, 0x53, 0x53])], 4, "Typed array fileBits");
test_first_argument(["bits", new Blob(["bits"]), new Blob(), new Uint8Array([0x50, 0x41]),
new Uint16Array([0x5353]), new Uint32Array([0x53534150])], 16, "Various fileBits");
test_first_argument([12], 2, "Number in fileBits");
test_first_argument([[1,2,3]], 5, "Array in fileBits");
test_first_argument([{}], 15, "Object in fileBits"); // "[object Object]"
test_first_argument([document.body], 24, "HTMLBodyElement in fileBits"); // "[object HTMLBodyElement]"
test_first_argument([to_string_obj], 8, "Object with toString in fileBits");
test_first_argument({[Symbol.iterator]() {
let i = 0;
return {next: () => [
{done:false, value:'ab'},
{done:false, value:'cde'},
{done:true}
][i++]};
}}, 5, 'Custom @@iterator');
[
'hello',
0,
null
].forEach(arg => {
test(t => {
assert_throws_js(TypeError, () => new File(arg, 'world.html'),
'Constructor should throw for invalid bits argument');
}, `Invalid bits argument: ${JSON.stringify(arg)}`);
});
test(t => {
assert_throws_js(Error, () => new File([to_string_throws], 'name.txt'),
'Constructor should propagate exceptions');
}, 'Bits argument: object that throws');
function test_second_argument(arg2, expectedFileName, testName) {
test(function() {
var file = new File(["bits"], arg2);
assert_true(file instanceof File);
assert_equals(file.name, expectedFileName);
}, testName);
}
test_second_argument("dummy", "dummy", "Using fileName");
test_second_argument("dummy/foo", "dummy/foo",
"No replacement when using special character in fileName");
test_second_argument(null, "null", "Using null fileName");
test_second_argument(1, "1", "Using number fileName");
test_second_argument('', '', "Using empty string fileName");
test_second_argument(document.body, '[object HTMLBodyElement]', "Using object fileName");
// testing the third argument
[
{type: 'text/plain', expected: 'text/plain'},
{type: 'text/plain;charset=UTF-8', expected: 'text/plain;charset=utf-8'},
{type: 'TEXT/PLAIN', expected: 'text/plain'},
{type: '𝓽𝓮𝔁𝓽/𝔭𝔩𝔞𝔦𝔫', expected: ''},
{type: 'ascii/nonprintable\u001F', expected: ''},
{type: 'ascii/nonprintable\u007F', expected: ''},
{type: 'nonascii\u00EE', expected: ''},
{type: 'nonascii\u1234', expected: ''},
{type: 'nonparsable', expected: 'nonparsable'}
].forEach(testCase => {
test(t => {
var file = new File(["bits"], "dummy", { type: testCase.type});
assert_true(file instanceof File);
assert_equals(file.type, testCase.expected);
}, `Using type in File constructor: ${testCase.type}`);
});
test(function() {
var file = new File(["bits"], "dummy", { lastModified: 42 });
assert_true(file instanceof File);
assert_equals(file.lastModified, 42);
}, "Using lastModified");
test(function() {
var file = new File(["bits"], "dummy", { name: "foo" });
assert_true(file instanceof File);
assert_equals(file.name, "dummy");
}, "Misusing name");
test(function() {
var file = new File(["bits"], "dummy", { unknownKey: "value" });
assert_true(file instanceof File);
assert_equals(file.name, "dummy");
}, "Unknown properties are ignored");
[
123,
123.4,
true,
'abc'
].forEach(arg => {
test(t => {
assert_throws_js(TypeError, () => new File(['bits'], 'name.txt', arg),
'Constructor should throw for invalid property bag type');
}, `Invalid property bag: ${JSON.stringify(arg)}`);
});
[
null,
undefined,
[1,2,3],
/regex/,
function() {}
].forEach(arg => {
test(t => {
assert_equals(new File(['bits'], 'name.txt', arg).size, 4,
'Constructor should accept object-ish property bag type');
}, `Unusual but valid property bag: ${arg}`);
});
test(t => {
assert_throws_js(Error,
() => new File(['bits'], 'name.txt', {type: to_string_throws}),
'Constructor should propagate exceptions');
}, 'Property bag propagates exceptions');
</script>