polkadot-js/common

// Copyright 2017-2024 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0

/// <reference types="@polkadot/dev-test/globals.d.ts" />

import { u8aToHex } from './toHexBuffer.js';

describe('u8aToHex', (): void => {
  it('returns empty as 0x', (): void => {
    expect(
      u8aToHex()
    ).toEqual('0x');
  });

  it('returns empty as "" (unprefixed)', (): void => {
    expect(
      u8aToHex(null, -1, false)
    ).toEqual('');
  });

  it('returns the hex value for the array', (): void => {
    expect(
      u8aToHex(
        new Uint8Array([128, 0, 10])
      )
    ).toEqual('0x80000a');
  });

  it('returns the hex value for the array (unprefixed)', (): void => {
    expect(
      u8aToHex(
        new Uint8Array([128, 0, 10]),
        -1,
        false
      )
    ).toEqual('80000a');
  });

  it('handles starting zeros correctly', (): void => {
    expect(
      u8aToHex(
        new Uint8Array([0, 1, 0, 0, 0, 0, 0, 0])
      )
    ).toEqual('0x0001000000000000');
  });

  it('returns the hex value where allowed < max', (): void => {
    expect(
      u8aToHex(
        new Uint8Array(Uint8Array.from([128, 0, 10, 11]), 64)
      )
    ).toEqual('0x80000a0b');
  });

  it('returns the trimmed hex value where allowed >= max', (): void => {
    expect(
      u8aToHex(
        new Uint8Array([128, 0, 10, 11, 12, 13]),
        32
      )
    ).toEqual('0x8000…0c0d');
  });
});