diff options
Diffstat (limited to 'cli/tests/node_compat/test/parallel/test-stream-readable-hwm-0-no-flow-data.js')
-rw-r--r-- | cli/tests/node_compat/test/parallel/test-stream-readable-hwm-0-no-flow-data.js | 111 |
1 files changed, 0 insertions, 111 deletions
diff --git a/cli/tests/node_compat/test/parallel/test-stream-readable-hwm-0-no-flow-data.js b/cli/tests/node_compat/test/parallel/test-stream-readable-hwm-0-no-flow-data.js deleted file mode 100644 index 3d9c0507a..000000000 --- a/cli/tests/node_compat/test/parallel/test-stream-readable-hwm-0-no-flow-data.js +++ /dev/null @@ -1,111 +0,0 @@ -// deno-fmt-ignore-file -// deno-lint-ignore-file - -// Copyright Joyent and Node contributors. All rights reserved. MIT license. -// Taken from Node 18.12.1 -// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually. - -'use strict'; - -const common = require('../common'); - -// Ensure that subscribing the 'data' event will not make the stream flow. -// The 'data' event will require calling read() by hand. -// -// The test is written for the (somewhat rare) highWaterMark: 0 streams to -// specifically catch any regressions that might occur with these streams. - -const assert = require('assert'); -const { Readable } = require('stream'); - -const streamData = [ 'a', null ]; - -// Track the calls so we can assert their order later. -const calls = []; -const r = new Readable({ - read: common.mustCall(() => { - calls.push('_read:' + streamData[0]); - process.nextTick(() => { - calls.push('push:' + streamData[0]); - r.push(streamData.shift()); - }); - }, streamData.length), - highWaterMark: 0, - - // Object mode is used here just for testing convenience. It really - // shouldn't affect the order of events. Just the data and its format. - objectMode: true, -}); - -assert.strictEqual(r.readableFlowing, null); -r.on('readable', common.mustCall(() => { - calls.push('readable'); -}, 2)); -assert.strictEqual(r.readableFlowing, false); -r.on('data', common.mustCall((data) => { - calls.push('data:' + data); -}, 1)); -r.on('end', common.mustCall(() => { - calls.push('end'); -})); -assert.strictEqual(r.readableFlowing, false); - -// The stream emits the events asynchronously but that's not guaranteed to -// happen on the next tick (especially since the _read implementation above -// uses process.nextTick). -// -// We use setImmediate here to give the stream enough time to emit all the -// events it's about to emit. -setImmediate(() => { - - // Only the _read, push, readable calls have happened. No data must be - // emitted yet. - assert.deepStrictEqual(calls, ['_read:a', 'push:a', 'readable']); - - // Calling 'r.read()' should trigger the data event. - assert.strictEqual(r.read(), 'a'); - assert.deepStrictEqual( - calls, - ['_read:a', 'push:a', 'readable', 'data:a']); - - // The next 'read()' will return null because hwm: 0 does not buffer any - // data and the _read implementation above does the push() asynchronously. - // - // Note: This 'null' signals "no data available". It isn't the end-of-stream - // null value as the stream doesn't know yet that it is about to reach the - // end. - // - // Using setImmediate again to give the stream enough time to emit all the - // events it wants to emit. - assert.strictEqual(r.read(), null); - setImmediate(() => { - - // There's a new 'readable' event after the data has been pushed. - // The 'end' event will be emitted only after a 'read()'. - // - // This is somewhat special for the case where the '_read' implementation - // calls 'push' asynchronously. If 'push' was synchronous, the 'end' event - // would be emitted here _before_ we call read(). - assert.deepStrictEqual( - calls, - ['_read:a', 'push:a', 'readable', 'data:a', - '_read:null', 'push:null', 'readable']); - - assert.strictEqual(r.read(), null); - - // While it isn't really specified whether the 'end' event should happen - // synchronously with read() or not, we'll assert the current behavior - // ('end' event happening on the next tick after read()) so any changes - // to it are noted and acknowledged in the future. - assert.deepStrictEqual( - calls, - ['_read:a', 'push:a', 'readable', 'data:a', - '_read:null', 'push:null', 'readable']); - process.nextTick(() => { - assert.deepStrictEqual( - calls, - ['_read:a', 'push:a', 'readable', 'data:a', - '_read:null', 'push:null', 'readable', 'end']); - }); - }); -}); |