test-buffer-inspect.js

// Copyright Joyent, Inc. and other Node contributors.
//
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//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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'use strict';
require('../common');
const assert = require('assert');
const util = require('util');
const buffer = require('buffer');

buffer.INSPECT_MAX_BYTES = 2;

let b = Buffer.allocUnsafe(4);
b.fill('1234');

let s = buffer.SlowBuffer(4);
s.fill('1234');

let expected = '<Buffer 31 32 ... 2 more bytes>';

assert.strictEqual(util.inspect(b), expected);
assert.strictEqual(util.inspect(s), expected);

b = Buffer.allocUnsafe(2);
b.fill('12');

s = buffer.SlowBuffer(2);
s.fill('12');

expected = '<Buffer 31 32>';

assert.strictEqual(util.inspect(b), expected);
assert.strictEqual(util.inspect(s), expected);

buffer.INSPECT_MAX_BYTES = Infinity;

assert.strictEqual(util.inspect(b), expected);
assert.strictEqual(util.inspect(s), expected);

b.inspect = undefined;
b.prop = new Uint8Array(0);
assert.strictEqual(
  util.inspect(b),
  '<Buffer 31 32, inspect: undefined, prop: Uint8Array []>'
);

b = Buffer.alloc(0);
b.prop = 123;

assert.strictEqual(
  util.inspect(b),
  '<Buffer prop: 123>'
);