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'use strict';
if (self.importScripts) {
self.importScripts('../resources/rs-utils.js');
self.importScripts('/resources/testharness.js');
}
test(() => {
const rs = new ReadableStream();
const result = rs.tee();
assert_true(Array.isArray(result), 'return value should be an array');
assert_equals(result.length, 2, 'array should have length 2');
assert_equals(result[0].constructor, ReadableStream, '0th element should be a ReadableStream');
assert_equals(result[1].constructor, ReadableStream, '1st element should be a ReadableStream');
}, 'ReadableStream teeing: rs.tee() returns an array of two ReadableStreams');
promise_test(t => {
const rs = new ReadableStream({
start(c) {
c.enqueue('a');
c.enqueue('b');
c.close();
}
});
const branch = rs.tee();
const branch1 = branch[0];
const branch2 = branch[1];
const reader1 = branch1.getReader();
const reader2 = branch2.getReader();
reader2.closed.then(t.unreached_func('branch2 should not be closed'));
return Promise.all([
reader1.closed,
reader1.read().then(r => {
assert_object_equals(r, { value: 'a', done: false }, 'first chunk from branch1 should be correct');
}),
reader1.read().then(r => {
assert_object_equals(r, { value: 'b', done: false }, 'second chunk from branch1 should be correct');
}),
reader1.read().then(r => {
assert_object_equals(r, { value: undefined, done: true }, 'third read() from branch1 should be done');
}),
reader2.read().then(r => {
assert_object_equals(r, { value: 'a', done: false }, 'first chunk from branch2 should be correct');
})
]);
}, 'ReadableStream teeing: should be able to read one branch to the end without affecting the other');
promise_test(() => {
const theObject = { the: 'test object' };
const rs = new ReadableStream({
start(c) {
c.enqueue(theObject);
}
});
const branch = rs.tee();
const branch1 = branch[0];
const branch2 = branch[1];
const reader1 = branch1.getReader();
const reader2 = branch2.getReader();
return Promise.all([reader1.read(), reader2.read()]).then(values => {
assert_object_equals(values[0], values[1], 'the values should be equal');
});
}, 'ReadableStream teeing: values should be equal across each branch');
promise_test(t => {
const theError = { name: 'boo!' };
const rs = new ReadableStream({
start(c) {
c.enqueue('a');
c.enqueue('b');
},
pull() {
throw theError;
}
});
const branches = rs.tee();
const reader1 = branches[0].getReader();
const reader2 = branches[1].getReader();
reader1.label = 'reader1';
reader2.label = 'reader2';
return Promise.all([
promise_rejects(t, theError, reader1.closed),
promise_rejects(t, theError, reader2.closed),
reader1.read().then(r => {
assert_object_equals(r, { value: 'a', done: false }, 'should be able to read the first chunk in branch1');
}),
reader1.read().then(r => {
assert_object_equals(r, { value: 'b', done: false }, 'should be able to read the second chunk in branch1');
return promise_rejects(t, theError, reader2.read());
})
.then(() => promise_rejects(t, theError, reader1.read()))
]);
}, 'ReadableStream teeing: errors in the source should propagate to both branches');
promise_test(() => {
const rs = new ReadableStream({
start(c) {
c.enqueue('a');
c.enqueue('b');
c.close();
}
});
const branches = rs.tee();
const branch1 = branches[0];
const branch2 = branches[1];
branch1.cancel();
return Promise.all([
readableStreamToArray(branch1).then(chunks => {
assert_array_equals(chunks, [], 'branch1 should have no chunks');
}),
readableStreamToArray(branch2).then(chunks => {
assert_array_equals(chunks, ['a', 'b'], 'branch2 should have two chunks');
})
]);
}, 'ReadableStream teeing: canceling branch1 should not impact branch2');
promise_test(() => {
const rs = new ReadableStream({
start(c) {
c.enqueue('a');
c.enqueue('b');
c.close();
}
});
const branches = rs.tee();
const branch1 = branches[0];
const branch2 = branches[1];
branch2.cancel();
return Promise.all([
readableStreamToArray(branch1).then(chunks => {
assert_array_equals(chunks, ['a', 'b'], 'branch1 should have two chunks');
}),
readableStreamToArray(branch2).then(chunks => {
assert_array_equals(chunks, [], 'branch2 should have no chunks');
})
]);
}, 'ReadableStream teeing: canceling branch2 should not impact branch2');
promise_test(() => {
const reason1 = new Error('We\'re wanted men.');
const reason2 = new Error('I have the death sentence on twelve systems.');
let resolve;
const promise = new Promise(r => resolve = r);
const rs = new ReadableStream({
cancel(reason) {
assert_array_equals(reason, [reason1, reason2],
'the cancel reason should be an array containing those from the branches');
resolve();
}
});
const branch = rs.tee();
const branch1 = branch[0];
const branch2 = branch[1];
branch1.cancel(reason1);
branch2.cancel(reason2);
return promise;
}, 'ReadableStream teeing: canceling both branches should aggregate the cancel reasons into an array');
promise_test(t => {
const theError = { name: 'I\'ll be careful.' };
const rs = new ReadableStream({
cancel() {
throw theError;
}
});
const branch = rs.tee();
const branch1 = branch[0];
const branch2 = branch[1];
return Promise.all([
promise_rejects(t, theError, branch1.cancel()),
promise_rejects(t, theError, branch2.cancel())
]);
}, 'ReadableStream teeing: failing to cancel the original stream should cause cancel() to reject on branches');
promise_test(() => {
let controller;
const rs = new ReadableStream({
start(c) {
controller = c;
}
});
const branches = rs.tee();
const reader1 = branches[0].getReader();
const reader2 = branches[1].getReader();
const promise = Promise.all([reader1.closed, reader2.closed]);
controller.close();
return promise;
}, 'ReadableStream teeing: closing the original should immediately close the branches');
promise_test(t => {
let controller;
const rs = new ReadableStream({
start(c) {
controller = c;
}
});
const branches = rs.tee();
const reader1 = branches[0].getReader();
const reader2 = branches[1].getReader();
const theError = { name: 'boo!' };
const promise = Promise.all([
promise_rejects(t, theError, reader1.closed),
promise_rejects(t, theError, reader2.closed)
]);
controller.error(theError);
return promise;
}, 'ReadableStream teeing: erroring the original should immediately error the branches');
done();
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