'use strict';const common = require('../common');const assert = require('assert');
const zero = [];const one = [ Buffer.from('asdf') ];const long = [];for (let i = 0; i < 10; i++) long.push(Buffer.from('asdf'));
const flatZero = Buffer.concat(zero);const flatOne = Buffer.concat(one);const flatLong = Buffer.concat(long);const flatLongLen = Buffer.concat(long, 40);
assert.strictEqual(flatZero.length, 0);assert.strictEqual(flatOne.toString(), 'asdf');
const check = 'asdf'.repeat(10);
assert.notStrictEqual(flatOne, one[0]);assert.strictEqual(flatLong.toString(), check);assert.strictEqual(flatLongLen.toString(), check);
[undefined, null, Buffer.from('hello')].forEach((value) => { assert.throws(() => { Buffer.concat(value); }, { code: 'ERR_INVALID_ARG_TYPE', message: 'The "list" argument must be an instance of Array.' + `${common.invalidArgTypeHelper(value)}` });});
[[42], ['hello', Buffer.from('world')]].forEach((value) => { assert.throws(() => { Buffer.concat(value); }, { code: 'ERR_INVALID_ARG_TYPE', message: 'The "list[0]" argument must be an instance of Buffer ' + `or Uint8Array.${common.invalidArgTypeHelper(value[0])}` });});
assert.throws(() => { Buffer.concat([Buffer.from('hello'), 3]);}, { code: 'ERR_INVALID_ARG_TYPE', message: 'The "list[1]" argument must be an instance of Buffer ' + 'or Uint8Array. Received type number (3)'});
const random10 = common.hasCrypto ? require('crypto').randomBytes(10) : Buffer.alloc(10, 1);const empty = Buffer.alloc(0);
assert.notDeepStrictEqual(random10, empty);assert.notDeepStrictEqual(random10, Buffer.alloc(10));
assert.deepStrictEqual(Buffer.concat([], 100), empty);assert.deepStrictEqual(Buffer.concat([random10], 0), empty);assert.deepStrictEqual(Buffer.concat([random10], 10), random10);assert.deepStrictEqual(Buffer.concat([random10, random10], 10), random10);assert.deepStrictEqual(Buffer.concat([empty, random10]), random10);assert.deepStrictEqual(Buffer.concat([random10, empty, empty]), random10);
assert.deepStrictEqual(Buffer.concat([empty], 100), Buffer.alloc(100));assert.deepStrictEqual(Buffer.concat([empty], 4096), Buffer.alloc(4096));assert.deepStrictEqual( Buffer.concat([random10], 40), Buffer.concat([random10, Buffer.alloc(30)]));
assert.deepStrictEqual(Buffer.concat([new Uint8Array([0x41, 0x42]), new Uint8Array([0x43, 0x44])]), Buffer.from('ABCD'));