@tetcoin/util/bn/toU8a.spec.js

A collection of useful utilities for @tetcoin

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

var _bn = _interopRequireDefault(require("bn.js"));

var _ = require(".");

// Copyright 2017-2019 @polkadot/util authors & contributors
// This software may be modified and distributed under the terms
// of the Apache-2.0 license. See the LICENSE file for details.
describe('bnToU8a', () => {
  it('converts null values to 0x00', () => {
    expect((0, _.bnToU8a)(null, -1, false)).toEqual(new Uint8Array([]));
  });
  it('converts null values to 0x00000000 (bitLength)', () => {
    expect((0, _.bnToU8a)(null, 32, false)).toEqual(new Uint8Array([0, 0, 0, 0]));
  });
  it('converts BN values to a prefixed hex representation', () => {
    expect((0, _.bnToU8a)(new _bn.default(0x123456), -1, false)).toEqual(new Uint8Array([0x12, 0x34, 0x56]));
  });
  it('converts BN values to a prefixed hex representation (bitLength)', () => {
    expect((0, _.bnToU8a)(new _bn.default(0x123456), 32, false)).toEqual(new Uint8Array([0x00, 0x12, 0x34, 0x56]));
  });
  it('converts using little endian (as set)', () => {
    expect((0, _.bnToU8a)(new _bn.default(0x123456), 32, true)).toEqual(new Uint8Array([0x56, 0x34, 0x12, 0x00]));
  });
  it('converts negative numbers', () => {
    expect((0, _.bnToU8a)(new _bn.default(-1234), {
      isNegative: true
    })).toEqual(new Uint8Array([46, 251]));
  });
  it('converts negative numbers (BE)', () => {
    expect((0, _.bnToU8a)(new _bn.default(-1234), {
      isNegative: true,
      isLe: false
    })).toEqual(new Uint8Array([251, 46]));
  });
  it('converts negative numbers (bitLength)', () => {
    expect((0, _.bnToU8a)(new _bn.default(-1234), {
      isNegative: true,
      bitLength: 32
    })).toEqual(new Uint8Array([46, 251, 255, 255]));
  });
  it('handles backwards compatibility', () => {
    expect((0, _.bnToU8a)(new _bn.default(1234), 32, false)).toEqual((0, _.bnToU8a)(new _bn.default(1234), {
      bitLength: 32,
      isLe: false
    }));
  });
});