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function assert_transfer_error(transferList) {
assert_throws_dom("DataCloneError", () => self.postMessage({ get whatever() { throw new Error("You should not have gotten to this point") } }, "*", transferList));
}
test(() => {
[self, self.document, new Image()].forEach(val => {
assert_transfer_error([val]);
});
}, "Cannot transfer all objects");
function transfer_tests(name, create) {
promise_test(async () => {
const transferable = await create();
assert_transfer_error([transferable, transferable]);
}, `Cannot transfer the same ${name} twice`);
promise_test(async () => {
const transferable = await create();
self.postMessage(null, "*", [transferable]);
assert_throws_dom("DataCloneError", () => self.postMessage(null, "*", [transferable]));
}, `Serialize should make the ${name} detached, so it cannot be transferred again`);
promise_test(async () => {
const transferable = await create(),
customError = new Error("hi");
self.postMessage(null, "*", [transferable]);
assert_throws_exactly(customError, () => self.postMessage({ get whatever() { throw customError } }, "*", [transferable]));
}, `Serialize should throw before a detached ${name} is found`);
promise_test(async () => {
const transferable = await create();
let seen = false;
const message = {
get a() {
self.postMessage(null, '*', [transferable]);
seen = true;
}
};
assert_throws_dom("DataCloneError", () => self.postMessage(message, "*", [transferable]));
assert_true(seen);
}, `Cannot transfer ${name} detached while the message was serialized`);
}
transfer_tests("ArrayBuffer", () => new ArrayBuffer(1));
transfer_tests("MessagePort", () => new MessageChannel().port1);
transfer_tests("ImageBitmap", () => self.createImageBitmap(document.createElement("canvas")));
transfer_tests("OffscreenCanvas", () => new OffscreenCanvas(1, 1));
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