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author | Yoshiya Hinosawa <stibium121@gmail.com> | 2023-02-21 00:35:04 +0900 |
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committer | GitHub <noreply@github.com> | 2023-02-20 16:35:04 +0100 |
commit | 6915a9b7a701dde0e1078867961c9a91811c1850 (patch) | |
tree | e6822f2b8400c7c7941d3cb9ace59842389b5bc9 /cli/tests/node_compat/test/parallel/test-stream-readable-hwm-0-no-flow-data.js | |
parent | a1cd2a5915c13f6a9b8eafa3807e143a02616bc1 (diff) |
test(ext/node): more node compat tests (#17827)
This PR adds the remaining ~650 Node.js compat test cases from std/node.
Among these 650 cases, about 130 cases are now failing. These failing
cases are prefixed with `TODO:` in `tests/node_compat/config.json`.
These will be addressed in later PRs.
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, 111 insertions, 0 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 new file mode 100644 index 000000000..38b69d2d9 --- /dev/null +++ b/cli/tests/node_compat/test/parallel/test-stream-readable-hwm-0-no-flow-data.js @@ -0,0 +1,111 @@ +// 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 "node/_tools/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']); + }); + }); +}); |