@tetcoin/util/u8a/toBn.spec.js

A collection of useful utilities for @tetcoin

"use strict";

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('u8aToBn', () => {
  it('converts little-endian by default', () => {
    expect((0, _.u8aToBn)(new Uint8Array([0x12, 0x34])).toString(16)).toBe('3412');
  });
  it('converts values (big-endian)', () => {
    expect((0, _.u8aToBn)(new Uint8Array([0x12, 0x34]), {
      isLe: false
    }).toString(16)).toBe('1234');
  });
  it('converts values (little-endian)', () => {
    expect((0, _.u8aToBn)(new Uint8Array([0x12, 0x34]), {
      isLe: true
    }).toString(16)).toBe('3412');
  });
  it('converts empty', () => {
    expect((0, _.u8aToBn)(new Uint8Array([]), {
      isLe: true
    }).toString(16)).toBe('0');
  });
  it('handles negative numbers (little-endian)', () => {
    expect((0, _.u8aToBn)(new Uint8Array([46, 251]), {
      isLe: true,
      isNegative: true
    }).toNumber()).toBe(-1234);
  });
  it('handles negative numbers (big-endian)', () => {
    expect((0, _.u8aToBn)(new Uint8Array([251, 46]), {
      isLe: false,
      isNegative: true
    }).toNumber()).toBe(-1234);
  });
  it('handles overflows correctly (little-endian)', () => {
    expect((0, _.u8aToBn)(new Uint8Array([0, 1, 0, 0, 0, 0, 0, 0]), {
      isLe: true
    }).toNumber()).toBe(256);
  });
  it('handles backward compatibility)', () => {
    expect((0, _.u8aToBn)(new Uint8Array([0, 1, 0, 0, 0, 0, 0, 0]), false).eq((0, _.u8aToBn)(new Uint8Array([0, 1, 0, 0, 0, 0, 0, 0]), {
      isLe: false
    }))).toBe(true);
    expect((0, _.u8aToBn)(new Uint8Array([0, 1, 0, 0, 0, 0, 0, 0]), true).eq((0, _.u8aToBn)(new Uint8Array([0, 1, 0, 0, 0, 0, 0, 0]), {
      isLe: true
    }))).toBe(true);
  });
});