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test: refactor test-stream-unshift-read-race
* add RegExp as second argument to assert.throws()
* replace process.on('exit', ...) boolean checks with common.mustCall()
* assert.equal() -> assert.strictEqual()
* add 1 ms duration as second argument to setTimeout()
* var -> const

PR-URL: #10532
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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Trott authored and evanlucas committed Jan 4, 2017
1 parent 4d984ec commit 82575f9
Showing 1 changed file with 30 additions and 37 deletions.
67 changes: 30 additions & 37 deletions test/parallel/test-stream-unshift-read-race.js
@@ -1,6 +1,6 @@
'use strict';
require('../common');
var assert = require('assert');
const common = require('../common');
const assert = require('assert');

// This test verifies that:
// 1. unshift() does not cause colliding _read() calls.
Expand All @@ -9,19 +9,19 @@ var assert = require('assert');
// 3. push() after the EOF signaling null is an error.
// 4. _read() is not called after pushing the EOF null chunk.

var stream = require('stream');
var hwm = 10;
var r = stream.Readable({ highWaterMark: hwm });
var chunks = 10;
const stream = require('stream');
const hwm = 10;
const r = stream.Readable({ highWaterMark: hwm });
const chunks = 10;

var data = Buffer.allocUnsafe(chunks * hwm + Math.ceil(hwm / 2));
for (var i = 0; i < data.length; i++) {
var c = 'asdf'.charCodeAt(i % 4);
const data = Buffer.allocUnsafe(chunks * hwm + Math.ceil(hwm / 2));
for (let i = 0; i < data.length; i++) {
const c = 'asdf'.charCodeAt(i % 4);
data[i] = c;
}

var pos = 0;
var pushedNull = false;
let pos = 0;
let pushedNull = false;
r._read = function(n) {
assert(!pushedNull, '_read after null push');

Expand All @@ -30,7 +30,7 @@ r._read = function(n) {

function push(fast) {
assert(!pushedNull, 'push() after null push');
var c = pos >= data.length ? null : data.slice(pos, pos + n);
const c = pos >= data.length ? null : data.slice(pos, pos + n);
pushedNull = c === null;
if (fast) {
pos += n;
Expand All @@ -41,59 +41,54 @@ r._read = function(n) {
pos += n;
r.push(c);
if (c === null) pushError();
});
}, 1);
}
}
};

function pushError() {
assert.throws(function() {
r.push(Buffer.allocUnsafe(1));
});
}, /^Error: stream.push\(\) after EOF$/);
}


var w = stream.Writable();
var written = [];
const w = stream.Writable();
const written = [];
w._write = function(chunk, encoding, cb) {
written.push(chunk.toString());
cb();
};

var ended = false;
r.on('end', function() {
assert(!ended, 'end emitted more than once');
r.on('end', common.mustCall(function() {
assert.throws(function() {
r.unshift(Buffer.allocUnsafe(1));
});
ended = true;
}, /^Error: stream.unshift\(\) after end event$/);
w.end();
});
}));

r.on('readable', function() {
var chunk;
let chunk;
while (null !== (chunk = r.read(10))) {
w.write(chunk);
if (chunk.length > 4)
r.unshift(Buffer.from('1234'));
}
});

var finished = false;
w.on('finish', function() {
finished = true;
w.on('finish', common.mustCall(function() {
// each chunk should start with 1234, and then be asfdasdfasdf...
// The first got pulled out before the first unshift('1234'), so it's
// lacking that piece.
assert.equal(written[0], 'asdfasdfas');
var asdf = 'd';
assert.strictEqual(written[0], 'asdfasdfas');
let asdf = 'd';
console.error('0: %s', written[0]);
for (var i = 1; i < written.length; i++) {
for (let i = 1; i < written.length; i++) {
console.error('%s: %s', i.toString(32), written[i]);
assert.equal(written[i].slice(0, 4), '1234');
for (var j = 4; j < written[i].length; j++) {
var c = written[i].charAt(j);
assert.equal(c, asdf);
assert.strictEqual(written[i].slice(0, 4), '1234');
for (let j = 4; j < written[i].length; j++) {
const c = written[i].charAt(j);
assert.strictEqual(c, asdf);
switch (asdf) {
case 'a': asdf = 's'; break;
case 's': asdf = 'd'; break;
Expand All @@ -102,11 +97,9 @@ w.on('finish', function() {
}
}
}
});
}));

process.on('exit', function() {
assert.equal(written.length, 18);
assert(ended, 'stream ended');
assert(finished, 'stream finished');
assert.strictEqual(written.length, 18);
console.log('ok');
});

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