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// Flags: --expose_internals
'use strict';
require('../common');
const assert = require('assert');
const BufferList = require('internal/streams/buffer_list');
// Test empty buffer list.
const emptyList = new BufferList();
emptyList.shift();
assert.deepStrictEqual(emptyList, new BufferList());
assert.strictEqual(emptyList.join(','), '');
assert.deepStrictEqual(emptyList.concat(0), Buffer.alloc(0));
const buf = Buffer.from('foo');
function testIterator(list, count) {
// test iterator
let len = 0;
// eslint-disable-next-line no-unused-vars
for (const x of list) {
len++;
}
assert.strictEqual(len, count);
}
// Test buffer list with one element.
const list = new BufferList();
testIterator(list, 0);
list.push(buf);
testIterator(list, 1);
for (const x of list) {
assert.strictEqual(x, buf);
}
const copy = list.concat(3);
testIterator(copy, 3);
assert.notStrictEqual(copy, buf);
assert.deepStrictEqual(copy, buf);
assert.strictEqual(list.join(','), 'foo');
const shifted = list.shift();
testIterator(list, 0);
assert.strictEqual(shifted, buf);
assert.deepStrictEqual(list, new BufferList());
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