mozilla-central/testing/web-platform/tests/FileAPI/blob/Blob-constructor.any.js (file symbol)

Source code

Revision control

Copy as Markdown

Other Tools

Test Info:

// META: title=Blob constructor
// META: script=../support/Blob.js
'use strict';
test(function() {
assert_true("Blob" in globalThis, "globalThis should have a Blob property.");
assert_equals(Blob.length, 0, "Blob.length should be 0.");
assert_true(Blob instanceof Function, "Blob should be a function.");
}, "Blob interface object");
// Step 1.
test(function() {
var blob = new Blob();
assert_true(blob instanceof Blob);
assert_equals(String(blob), '[object Blob]');
assert_equals(blob.size, 0);
assert_equals(blob.type, "");
}, "Blob constructor with no arguments");
test(function() {
assert_throws_js(TypeError, function() { var blob = Blob(); });
}, "Blob constructor with no arguments, without 'new'");
test(function() {
var blob = new Blob;
assert_true(blob instanceof Blob);
assert_equals(blob.size, 0);
assert_equals(blob.type, "");
}, "Blob constructor without brackets");
test(function() {
var blob = new Blob(undefined);
assert_true(blob instanceof Blob);
assert_equals(String(blob), '[object Blob]');
assert_equals(blob.size, 0);
assert_equals(blob.type, "");
}, "Blob constructor with undefined as first argument");
// blobParts argument (WebIDL).
test(function() {
var args = [
null,
true,
false,
0,
1,
1.5,
"FAIL",
new Date(),
new RegExp(),
{},
{ 0: "FAIL", length: 1 },
];
args.forEach(function(arg) {
assert_throws_js(TypeError, function() {
new Blob(arg);
}, "Should throw for argument " + format_value(arg) + ".");
});
}, "Passing non-objects, Dates and RegExps for blobParts should throw a TypeError.");
test_blob(function() {
return new Blob({
[Symbol.iterator]: Array.prototype[Symbol.iterator],
});
}, {
expected: "",
type: "",
desc: "A plain object with @@iterator should be treated as a sequence for the blobParts argument."
});
test(t => {
const blob = new Blob({
[Symbol.iterator]() {
var i = 0;
return {next: () => [
{done:false, value:'ab'},
{done:false, value:'cde'},
{done:true}
][i++]
};
}
});
assert_equals(blob.size, 5, 'Custom @@iterator should be treated as a sequence');
}, "A plain object with custom @@iterator should be treated as a sequence for the blobParts argument.");
test_blob(function() {
return new Blob({
[Symbol.iterator]: Array.prototype[Symbol.iterator],
0: "PASS",
length: 1
});
}, {
expected: "PASS",
type: "",
desc: "A plain object with @@iterator and a length property should be treated as a sequence for the blobParts argument."
});
test_blob(function() {
return new Blob(new String("xyz"));
}, {
expected: "xyz",
type: "",
desc: "A String object should be treated as a sequence for the blobParts argument."
});
test_blob(function() {
return new Blob(new Uint8Array([1, 2, 3]));
}, {
expected: "123",
type: "",
desc: "A Uint8Array object should be treated as a sequence for the blobParts argument."
});
var test_error = {
name: "test",
message: "test error",
};
test(function() {
var obj = {
[Symbol.iterator]: Array.prototype[Symbol.iterator],
get length() { throw test_error; }
};
assert_throws_exactly(test_error, function() {
new Blob(obj);
});
}, "The length getter should be invoked and any exceptions should be propagated.");
test(function() {
assert_throws_exactly(test_error, function() {
var obj = {
[Symbol.iterator]: Array.prototype[Symbol.iterator],
length: {
valueOf: null,
toString: function() { throw test_error; }
}
};
new Blob(obj);
});
assert_throws_exactly(test_error, function() {
var obj = {
[Symbol.iterator]: Array.prototype[Symbol.iterator],
length: { valueOf: function() { throw test_error; } }
};
new Blob(obj);
});
}, "ToUint32 should be applied to the length and any exceptions should be propagated.");
test(function() {
var received = [];
var obj = {
get [Symbol.iterator]() {
received.push("Symbol.iterator");
return Array.prototype[Symbol.iterator];
},
get length() {
received.push("length getter");
return {
valueOf: function() {
received.push("length valueOf");
return 3;
}
};
},
get 0() {
received.push("0 getter");
return {
toString: function() {
received.push("0 toString");
return "a";
}
};
},
get 1() {
received.push("1 getter");
throw test_error;
},
get 2() {
received.push("2 getter");
assert_unreached("Should not call the getter for 2 if the getter for 1 threw.");
}
};
assert_throws_exactly(test_error, function() {
new Blob(obj);
});
assert_array_equals(received, [
"Symbol.iterator",
"length getter",
"length valueOf",
"0 getter",
"0 toString",
"length getter",
"length valueOf",
"1 getter",
]);
}, "Getters and value conversions should happen in order until an exception is thrown.");
// XXX should add tests edge cases of ToLength(length)
test(function() {
assert_throws_exactly(test_error, function() {
new Blob([{ toString: function() { throw test_error; } }]);
}, "Throwing toString");
assert_throws_exactly(test_error, function() {
new Blob([{ toString: undefined, valueOf: function() { throw test_error; } }]);
}, "Throwing valueOf");
assert_throws_exactly(test_error, function() {
new Blob([{
toString: function() { throw test_error; },
valueOf: function() { assert_unreached("Should not call valueOf if toString is present."); }
}]);
}, "Throwing toString and valueOf");
assert_throws_js(TypeError, function() {
new Blob([{toString: null, valueOf: null}]);
}, "Null toString and valueOf");
}, "ToString should be called on elements of the blobParts array and any exceptions should be propagated.");
test_blob(function() {
var arr = [
{ toString: function() { arr.pop(); return "PASS"; } },
{ toString: function() { assert_unreached("Should have removed the second element of the array rather than called toString() on it."); } }
];
return new Blob(arr);
}, {
expected: "PASS",
type: "",
desc: "Changes to the blobParts array should be reflected in the returned Blob (pop)."
});
test_blob(function() {
var arr = [
{
toString: function() {
if (arr.length === 3) {
return "A";
}
arr.unshift({
toString: function() {
assert_unreached("Should only access index 0 once.");
}
});
return "P";
}
},
{
toString: function() {
return "SS";
}
}
];
return new Blob(arr);
}, {
expected: "PASS",
type: "",
desc: "Changes to the blobParts array should be reflected in the returned Blob (unshift)."
});
test_blob(function() {
return new Blob([
null,
undefined,
true,
false,
0,
1,
new String("stringobject"),
[],
['x', 'y'],
{},
{ 0: "FAIL", length: 1 },
{ toString: function() { return "stringA"; } },
{ toString: undefined, valueOf: function() { return "stringB"; } },
{ valueOf: function() { assert_unreached("Should not call valueOf if toString is present on the prototype."); } }
]);
}, {
expected: "nullundefinedtruefalse01stringobjectx,y[object Object][object Object]stringAstringB[object Object]",
type: "",
desc: "ToString should be called on elements of the blobParts array."
});
test_blob(function() {
return new Blob([
new ArrayBuffer(8)
]);
}, {
expected: "\0\0\0\0\0\0\0\0",
type: "",
desc: "ArrayBuffer elements of the blobParts array should be supported."
});
test_blob(function() {
return new Blob([
new Uint8Array([0x50, 0x41, 0x53, 0x53]),
new Int8Array([0x50, 0x41, 0x53, 0x53]),
new Uint16Array([0x4150, 0x5353]),
new Int16Array([0x4150, 0x5353]),
new Uint32Array([0x53534150]),
new Int32Array([0x53534150]),
new Float32Array([0xD341500000])
]);
}, {
expected: "PASSPASSPASSPASSPASSPASSPASS",
type: "",
desc: "Passing typed arrays as elements of the blobParts array should work."
});
test_blob(function() {
return new Blob([
new Float16Array([2.65625, 58.59375])
]);
}, {
expected: "PASS",
type: "",
desc: "Passing a Float16Array as element of the blobParts array should work."
});
test_blob(function() {
return new Blob([
// 0x535 3415053534150
// 0x535 = 0b010100110101 -> Sign = +, Exponent = 1333 - 1023 = 310
// 0x13415053534150 * 2**(-52)
// ==> 0x13415053534150 * 2**258 = 2510297372767036725005267563121821874921913208671273727396467555337665343087229079989707079680
new Float64Array([2510297372767036725005267563121821874921913208671273727396467555337665343087229079989707079680])
]);
}, {
expected: "PASSPASS",
type: "",
desc: "Passing a Float64Array as element of the blobParts array should work."
});
test_blob(function() {
return new Blob([
new BigInt64Array([BigInt("0x5353415053534150")]),
new BigUint64Array([BigInt("0x5353415053534150")])
]);
}, {
expected: "PASSPASSPASSPASS",
type: "",
desc: "Passing BigInt typed arrays as elements of the blobParts array should work."
});
var t_ports = async_test("Passing a FrozenArray as the blobParts array should work (FrozenArray<MessagePort>).");
t_ports.step(function() {
var channel = new MessageChannel();
channel.port2.onmessage = this.step_func(function(e) {
var b_ports = new Blob(e.ports);
assert_equals(b_ports.size, "[object MessagePort]".length);
this.done();
});
var channel2 = new MessageChannel();
channel.port1.postMessage('', [channel2.port1]);
});
test_blob(function() {
var blob = new Blob(['foo']);
return new Blob([blob, blob]);
}, {
expected: "foofoo",
type: "",
desc: "Array with two blobs"
});
test_blob_binary(function() {
var view = new Uint8Array([0, 255, 0]);
return new Blob([view.buffer, view.buffer]);
}, {
expected: [0, 255, 0, 0, 255, 0],
type: "",
desc: "Array with two buffers"
});
test_blob_binary(function() {
var view = new Uint8Array([0, 255, 0, 4]);
var blob = new Blob([view, view]);
assert_equals(blob.size, 8);
var view1 = new Uint16Array(view.buffer, 2);
return new Blob([view1, view.buffer, view1]);
}, {
expected: [0, 4, 0, 255, 0, 4, 0, 4],
type: "",
desc: "Array with two bufferviews"
});
test_blob(function() {
var view = new Uint8Array([0]);
var blob = new Blob(["fo"]);
return new Blob([view.buffer, blob, "foo"]);
}, {
expected: "\0fofoo",
type: "",
desc: "Array with mixed types"
});
test(function() {
const accessed = [];
const stringified = [];
new Blob([], {
get type() { accessed.push('type'); },
get endings() { accessed.push('endings'); }
});
new Blob([], {
type: { toString: () => { stringified.push('type'); return ''; } },
endings: { toString: () => { stringified.push('endings'); return 'transparent'; } }
});
assert_array_equals(accessed, ['endings', 'type']);
assert_array_equals(stringified, ['endings', 'type']);
}, "options properties should be accessed in lexicographic order.");
test(function() {
assert_throws_exactly(test_error, function() {
new Blob(
[{ toString: function() { throw test_error } }],
{
get type() { assert_unreached("type getter should not be called."); }
}
);
});
}, "Arguments should be evaluated from left to right.");
[
null,
undefined,
{},
{ unrecognized: true },
/regex/,
function() {}
].forEach(function(arg, idx) {
test_blob(function() {
return new Blob([], arg);
}, {
expected: "",
type: "",
desc: "Passing " + format_value(arg) + " (index " + idx + ") for options should use the defaults."
});
test_blob(function() {
return new Blob(["\na\r\nb\n\rc\r"], arg);
}, {
expected: "\na\r\nb\n\rc\r",
type: "",
desc: "Passing " + format_value(arg) + " (index " + idx + ") for options should use the defaults (with newlines)."
});
});
[
123,
123.4,
true,
'abc'
].forEach(arg => {
test(t => {
assert_throws_js(TypeError, () => new Blob([], arg),
'Blob constructor should throw with invalid property bag');
}, `Passing ${JSON.stringify(arg)} for options should throw`);
});
var type_tests = [
// blobParts, type, expected type
[[], '', ''],
[[], 'a', 'a'],
[[], 'A', 'a'],
[[], 'text/html', 'text/html'],
[[], 'TEXT/HTML', 'text/html'],
[[], 'text/plain;charset=utf-8', 'text/plain;charset=utf-8'],
[[], '\u00E5', ''],
[[], '\uD801\uDC7E', ''], // U+1047E
[[], ' image/gif ', ' image/gif '],
[[], '\timage/gif\t', ''],
[[], 'image/gif;\u007f', ''],
[[], '\u0130mage/gif', ''], // uppercase i with dot
[[], '\u0131mage/gif', ''], // lowercase dotless i
[[], 'image/gif\u0000', ''],
// check that type isn't changed based on sniffing
[[0x3C, 0x48, 0x54, 0x4D, 0x4C, 0x3E], 'unknown/unknown', 'unknown/unknown'], // "<HTML>"
[[0x00, 0xFF], 'text/plain', 'text/plain'],
[[0x47, 0x49, 0x46, 0x38, 0x39, 0x61], 'image/png', 'image/png'], // "GIF89a"
];
type_tests.forEach(function(t) {
test(function() {
var arr = new Uint8Array([t[0]]).buffer;
var b = new Blob([arr], {type:t[1]});
assert_equals(b.type, t[2]);
}, "Blob with type " + format_value(t[1]));
});