Ethereum-test-network NPM

NPM

npm i --save-dev ethereum-test-network

Yarn

yarn add --dev ethereum-test-network

Use its

import { TestNetwork } from 'ethereum-test-network';

describe('eth test network', () => {
  let testnetwork: TestNetwork;

  // Act before assertions
  beforeEach(async () => {
    testnetwork = await TestNetwork.init();
  });
  afterEach(async () => {
    await testnetwork.close();
  });

  it('should check block number', async () => {
    const provider = new ethers.providers.JsonRpcProvider(JSON_RPC_PROVIDER);
    const blockNumber = await provider.getBlockNumber();
    expect(blockNumber).toBe(0);
  });
});

Defaults

const DEFAULT_CHAIN_ID = 123;
const DEFAULT_NETWORK_ID = 234;
const DEFAULT_GENESIS_ACCOUNTS = [
  {
    balance: '0x295BE96E64066972000000',
    privateKey:
      '0xa3dac6ca0b1c61f5f0a0b3a0acf93c9a52fd94e8e33d243d3b3a8b8c5dc37f0b', // 0xaaE062157B53077da1414ec3579b4CBdF7a4116f
  },
  {
    balance: '0x295BE96E64066972000000',
    privateKey:
      '0xfc6e27fbc1cc2eb3f04dab6259d926280d4aa8acb8c83f3de506ab9d589d6cc2', // 0xbbDBFf23Df1e064f458aCd943E48179bD3271fA0
  },
  {
    balance: '0x295BE96E64066972000000',
    privateKey:
      '0x735e4ab2cd08798dee1a5fc3a7af4bbdeece90c7dbdf878ceec556c84bd5ec88', // 0xcc5a0dc5152D368D55A10f68f874A05A4dd65bee
  },
];
const DEFAULT_JSON_RPC_PORT = 8545;
const DEFAULT_BLOCK_GAS_LIMIT = 6000000;