| '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(); |