stream: initial port of test262 tests

lib/internal/streams/operators.js

@@ -166,7 +166,7 @@ function map(fn, options) {
   }.call(this);
 }
 
-function asIndexedPairs(options) {
+function asIndexedPairs(options = undefined) {
   if (options != null && typeof options !== 'object') {
     throw new ERR_INVALID_ARG_TYPE('options', ['Object']);
   }
@@ -350,7 +350,7 @@ function toIntegerOrInfinity(number) {
   return number;
 }
 
-function drop(number, options) {
+function drop(number, options = undefined) {
   if (options != null && typeof options !== 'object') {
     throw new ERR_INVALID_ARG_TYPE('options', ['Object']);
   }
@@ -374,7 +374,7 @@ function drop(number, options) {
   }.call(this);
 }
 
-function take(number, options) {
+function take(number, options = undefined) {
   if (options != null && typeof options !== 'object') {
     throw new ERR_INVALID_ARG_TYPE('options', ['Object']);
   }

lib/stream.js

@@ -35,6 +35,12 @@ const {
   streamReturningOperators,
   promiseReturningOperators,
 } = require('internal/streams/operators');
+
+const {
+  codes: {
+    ERR_ILLEGAL_CONSTRUCTOR,
+  },
+} = require('internal/errors');
 const compose = require('internal/streams/compose');
 const { pipeline } = require('internal/streams/pipeline');
 const { destroyer } = require('internal/streams/destroy');
@@ -51,15 +57,34 @@ Stream.isReadable = utils.isReadable;
 Stream.Readable = require('internal/streams/readable');
 for (const key of ObjectKeys(streamReturningOperators)) {
   const op = streamReturningOperators[key];
-  Stream.Readable.prototype[key] = function(...args) {
+  function fn(...args) {
+    if (new.target) {
+      throw ERR_ILLEGAL_CONSTRUCTOR();
+    }
     return Stream.Readable.from(ReflectApply(op, this, args));
-  };
+  }
+  ObjectDefineProperty(fn, 'name', { value: op.name });
+  ObjectDefineProperty(fn, 'length', { value: op.length });
+  ObjectDefineProperty(Stream.Readable.prototype, key, {
+    value: fn,
+    enumerable: false,
+    configurable: true,
+    writable: false,
+  });
 }
 for (const key of ObjectKeys(promiseReturningOperators)) {
   const op = promiseReturningOperators[key];
-  Stream.Readable.prototype[key] = function(...args) {
+  function fn(...args) {
     return ReflectApply(op, this, args);
-  };
+  }
+  ObjectDefineProperty(fn, 'name', { value: op.name });
+  ObjectDefineProperty(fn, 'length', { value: op.length });
+  ObjectDefineProperty(Stream.Readable.prototype, key, {
+    value: fn,
+    enumerable: false,
+    configurable: true,
+    writable: false,
+  });
 }
 Stream.Writable = require('internal/streams/writable');
 Stream.Duplex = require('internal/streams/duplex');

test/parallel/test-stream-iterator-helpers-test262-tests.mjs

@@ -0,0 +1,115 @@
+import '../common/index.mjs';
+import { Readable } from 'stream';
+import assert from 'assert';
+
+// These tests are manually ported from the draft PR for the test262 test suite
+// Authored by Rick Waldron in https://github.com/tc39/test262/pull/2818/files
+
+// test262 license:
+// The << Software identified by reference to the Ecma Standard* ("Software)">>
+// is protected by copyright and is being made available under the
+// "BSD License", included below. This Software may be subject to third party
+// rights (rights from parties other than Ecma International), including patent
+// rights, and no licenses under such third party rights are granted under this
+// license even if the third party concerned is a member of Ecma International.
+// SEE THE ECMA CODE OF CONDUCT IN PATENT MATTERS AVAILABLE AT
+// http://www.ecma-international.org/memento/codeofconduct.htm FOR INFORMATION
+// REGARDING THE LICENSING OF PATENT CLAIMS THAT ARE REQUIRED TO IMPLEMENT ECMA
+// INTERNATIONAL STANDARDS*
+
+// Copyright (C) 2012-2013 Ecma International
+// All rights reserved.
+
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+// 1.   Redistributions of source code must retain the above copyright notice,
+//      this list of conditions and the following disclaimer.
+// 2.   Redistributions in binary form must reproduce the above copyright
+//      notice, this list of conditions and the following disclaimer in the
+//      documentation and/or other materials provided with the distribution.
+// 3.   Neither the name of the authors nor Ecma International may be used to
+//      endorse or promote products derived from this software without specific
+//      prior written permission.
+
+// THIS SOFTWARE IS PROVIDED BY THE ECMA INTERNATIONAL "AS IS" AND ANY EXPRESS
+// OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+// NO EVENT SHALL ECMA INTERNATIONAL BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// * Ecma International Standards hereafter means Ecma International Standards
+// as well as Ecma Technical Reports
+
+
+// Note all the tests that check AsyncIterator's prototype itself and things
+// that happen before stream conversion were not ported.
+{
+  // asIndexedPairs/is-function
+  assert.strictEqual(typeof Readable.prototype.asIndexedPairs, 'function');
+  // asIndexedPairs/indexed-pairs.js
+  const iterator = Readable.from([0, 1]);
+  const indexedPairs = iterator.asIndexedPairs();
+
+  for await (const [i, v] of indexedPairs) {
+    assert.strictEqual(i, v);
+  }
+  // asIndexedPairs/length.js
+  assert.strictEqual(Readable.prototype.asIndexedPairs.length, 0);
+  // asIndexedPairs/name.js
+  assert.strictEqual(Readable.prototype.asIndexedPairs.name, 'asIndexedPairs');
+  const descriptor = Object.getOwnPropertyDescriptor(
+    Readable.prototype,
+    'asIndexedPairs'
+  );
+  assert.strictEqual(descriptor.enumerable, false);
+  assert.strictEqual(descriptor.configurable, true);
+  assert.strictEqual(descriptor.writable, false);
+}
+{
+  // drop/length
+  assert.strictEqual(Readable.prototype.drop.length, 1);
+  const descriptor = Object.getOwnPropertyDescriptor(
+    Readable.prototype,
+    'drop'
+  );
+  assert.strictEqual(descriptor.enumerable, false);
+  assert.strictEqual(descriptor.configurable, true);
+  assert.strictEqual(descriptor.writable, false);
+  // drop/limit-equals-total
+  const iterator = Readable.from([1, 2]).drop(2);
+  const result = await iterator[Symbol.asyncIterator]().next();
+  assert.deepStrictEqual(result, { done: true, value: undefined });
+  // drop/limit-greater-than-total.js
+  const iterator2 = Readable.from([1, 2]).drop(3);
+  const result2 = await iterator2[Symbol.asyncIterator]().next();
+  assert.deepStrictEqual(result2, { done: true, value: undefined });
+  // drop/limit-less-than-total.js
+  const iterator3 = Readable.from([1, 2]).drop(1);
+  const result3 = await iterator3[Symbol.asyncIterator]().next();
+  assert.deepStrictEqual(result3, { done: false, value: 2 });
+  // drop/limit-rangeerror
+  assert.throws(() => Readable.from([1]).drop(-1), RangeError);
+  assert.throws(() => {
+    Readable.from([1]).drop({
+      valueOf() {
+        throw new Error('boom');
+      }
+    });
+  }, /boom/);
+  // drop/limit-tointeger
+  const two = await Readable.from([1, 2]).drop({ valueOf: () => 1 }).toArray();
+  assert.deepStrictEqual(two, [2]);
+  // drop/name
+  assert.strictEqual(Readable.prototype.drop.name, 'drop');
+  // drop/non-constructible
+  assert.throws(() => new Readable.prototype.drop(1), TypeError);
+  // drop/proto
+  const proto = Object.getPrototypeOf(Readable.prototype.drop);
+  assert.strictEqual(proto, Function.prototype);
+
+}