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test: increase test coverage of BufferList #10171

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test: increase test coverage of BufferList 
Add tests for edges cases of BufferList

- test operations when the length is 0
- test operations when the list only has one element
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@joyeecheung
joyeecheung committed Dec 8, 2016
commit a136e2d64449489094c778ca76434f678bbec336
27 changes: 27 additions & 0 deletions test/parallel/test-stream-buffer-list.js
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@@ -0,0 +1,27 @@
// Flags: --expose_internals
'use strict';
require('../common');
const assert = require('assert');
const BufferList = require('internal/streams/BufferList');

// 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));

// Test buffer list with one element.
const list = new BufferList();
list.push('foo');

assert.strictEqual(list.concat(1), 'foo');

assert.strictEqual(list.join(','), 'foo');

const shifted = list.shift();
assert.strictEqual(shifted, 'foo');
assert.deepStrictEqual(list, new BufferList());