@tetcoin/util/compact/fromU8a.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 _toU8a = _interopRequireDefault(require("../hex/toU8a"));

var _fromU8a = _interopRequireDefault(require("./fromU8a"));

// Copyright 2017-2019 @polkadot/util authors & contributors
// This software may be modified and distributed under the terms
// of the ISC license. See the LICENSE file for details.
describe('compactFromU8a', () => {
  it('decoded u8 value', () => {
    expect((0, _fromU8a.default)(new Uint8Array([0b11111100]))).toEqual([1, new _bn.default(63)]);
  });
  it('decodes from same u16 encoded value', () => {
    expect((0, _fromU8a.default)(new Uint8Array([0b11111101, 0b00000111]), 32)).toEqual([2, new _bn.default(511)]);
  });
  it('decodes from same u32 encoded value (short)', () => {
    expect((0, _fromU8a.default)(new Uint8Array([254, 255, 3, 0]), 32)).toEqual([4, new _bn.default(0xffff)]);
  });
  it('decodes from same u32 encoded value (full)', () => {
    expect((0, _fromU8a.default)(new Uint8Array([3, 249, 255, 255, 255]), 32)).toEqual([5, new _bn.default(0xfffffff9)]);
  });
  it('decodes from same u32 as u64 encoded value (full, default)', () => {
    expect((0, _fromU8a.default)(new Uint8Array([3 + (4 - 4 << 2), 249, 255, 255, 255]), 64)).toEqual([5, new _bn.default(0xfffffff9)]);
  });
  it('decodes an actual value', () => {
    expect((0, _fromU8a.default)((0, _toU8a.default)('0x0b00407a10f35a'))).toEqual([7, new _bn.default('5af3107a4000', 16)]);
  });
});