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Improvements to test-buffer-slice from NINA code & learn #10048

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Improvements to test-buffer-slice from NINA code & learn #10048

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Test: strictCompare and explcit inputs mprovement to test-buffer-slice
Dec 1, 2016
429ee39
Test: strictCompare and explcit inputs mprovement to test-buffer-slice
Dec 1, 2016
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127 changes: 80 additions & 47 deletions test/parallel/test-buffer-slice.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,52 +3,83 @@
require('../common');
const assert = require('assert');

assert.strictEqual(0, Buffer.from('hello').slice(0, 0).length);
assert.strictEqual(0, Buffer('hello').slice(0, 0).length);
assert.strictEqual(0, Buffer.from('hello', 'utf8').slice(0, 0).length);
assert.strictEqual(0, Buffer('hello', 'utf8').slice(0, 0).length);
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nit: adding 'utf8' to these is unnecessary since that is the default already.


const buf = Buffer.from('0123456789');
assert.equal(buf.slice(-10, 10), '0123456789');
assert.equal(buf.slice(-20, 10), '0123456789');
assert.equal(buf.slice(-20, -10), '');
assert.equal(buf.slice(), '0123456789');
assert.equal(buf.slice(0), '0123456789');
assert.equal(buf.slice(0, 0), '');
assert.equal(buf.slice(undefined), '0123456789');
assert.equal(buf.slice('foobar'), '0123456789');
assert.equal(buf.slice(undefined, undefined), '0123456789');
const buf = Buffer.from('0123456789', 'utf8');
assert.strictEqual(0, Buffer.compare(buf.slice(-10, 10),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-20, 10),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-20, -10),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0, 0),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(undefined),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('foobar'),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(undefined, undefined),
Buffer.from('0123456789', 'utf8')));

assert.equal(buf.slice(2), '23456789');
assert.equal(buf.slice(5), '56789');
assert.equal(buf.slice(10), '');
assert.equal(buf.slice(5, 8), '567');
assert.equal(buf.slice(8, -1), '8');
assert.equal(buf.slice(-10), '0123456789');
assert.equal(buf.slice(0, -9), '0');
assert.equal(buf.slice(0, -10), '');
assert.equal(buf.slice(0, -1), '012345678');
assert.equal(buf.slice(2, -2), '234567');
assert.equal(buf.slice(0, 65536), '0123456789');
assert.equal(buf.slice(65536, 0), '');
assert.equal(buf.slice(-5, -8), '');
assert.equal(buf.slice(-5, -3), '56');
assert.equal(buf.slice(-10, 10), '0123456789');
for (let i = 0, s = buf.toString(); i < buf.length; ++i) {
assert.equal(buf.slice(i), s.slice(i));
assert.equal(buf.slice(0, i), s.slice(0, i));
assert.equal(buf.slice(-i), s.slice(-i));
assert.equal(buf.slice(0, -i), s.slice(0, -i));
assert.strictEqual(0, Buffer.compare(buf.slice(2),
Buffer.from('23456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(5),
Buffer.from('56789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(10),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(5, 8),
Buffer.from('567', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(8, -1),
Buffer.from('8', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-10),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0, -9),
Buffer.from('0', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0, -10),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0, -1),
Buffer.from('012345678', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(2, -2),
Buffer.from('234567', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(0, 65536),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(65536, 0),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-5, -8),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-5, -3),
Buffer.from('56', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice(-10, 10),
Buffer.from('0123456789', 'utf8')));
for (let i = 0, s = buf; i < buf.length; ++i) {
assert.strictEqual(0, Buffer.compare(buf.slice(i), s.slice(i)));
assert.strictEqual(0, Buffer.compare(buf.slice(0, i), s.slice(0, i)));
assert.strictEqual(0, Buffer.compare(buf.slice(-i), s.slice(-i)));
assert.strictEqual(0, Buffer.compare(buf.slice(0, -i), s.slice(0, -i)));
}

const utf16Buf = Buffer.from('0123456789', 'utf16le');
assert.deepStrictEqual(utf16Buf.slice(0, 6), Buffer.from('012', 'utf16le'));

assert.equal(buf.slice('0', '1'), '0');
assert.equal(buf.slice('-5', '10'), '56789');
assert.equal(buf.slice('-10', '10'), '0123456789');
assert.equal(buf.slice('-10', '-5'), '01234');
assert.equal(buf.slice('-10', '-0'), '');
assert.equal(buf.slice('111'), '');
assert.equal(buf.slice('0', '-111'), '');
assert.strictEqual(0, Buffer.compare(buf.slice('0', '1'),
Buffer.from('0', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('-5', '10'),
Buffer.from('56789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('-10', '10'),
Buffer.from('0123456789', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('-10', '-5'),
Buffer.from('01234', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('-10', '-0'),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('111'),
Buffer.from('', 'utf8')));
assert.strictEqual(0, Buffer.compare(buf.slice('0', '-111'),
Buffer.from('', 'utf8')));

// try to slice a zero length Buffer
// see https://github.com/joyent/node/issues/5881
Expand All @@ -57,30 +88,32 @@ assert.strictEqual(Buffer.alloc(0).slice(0, 1).length, 0);

{
// Single argument slice
assert.strictEqual('bcde', Buffer.from('abcde').slice(1).toString());
assert.strictEqual('bcde',
Buffer.from('abcde', 'utf8').slice(1).toString('utf8'));
}

// slice(0,0).length === 0
assert.strictEqual(0, Buffer.from('hello').slice(0, 0).length);
assert.strictEqual(0, Buffer.from('hello', 'utf8').slice(0, 0).length);

{
// Regression tests for https://github.com/nodejs/node/issues/9096
const buf = Buffer.from('abcd');
assert.strictEqual(buf.slice(buf.length / 3).toString(), 'bcd');
const buf = Buffer.from('abcd', 'utf8');
assert.strictEqual(buf.slice(buf.length / 3).toString('utf8'), 'bcd');
assert.strictEqual(
buf.slice(buf.length / 3, buf.length).toString(),
'bcd'
);
}

{
const buf = Buffer.from('abcdefg');
assert.strictEqual(buf.slice(-(-1 >>> 0) - 1).toString(), buf.toString());
const buf = Buffer.from('abcdefg', 'utf8');
assert.strictEqual(buf.slice(-(-1 >>> 0) - 1).toString('utf8'),
buf.toString('utf8'));
}

{
const buf = Buffer.from('abc');
assert.strictEqual(buf.slice(-0.5).toString(), buf.toString());
const buf = Buffer.from('abc', 'utf8');
assert.strictEqual(buf.slice(-0.5).toString('utf8'), buf.toString('utf8'));
}

{
Expand Down