lightning/test/lnd_methods/onchain/test_subscribe_to_chain_spend.js

Lightning Network client library

const EventEmitter = require('node:events');
const {strictEqual} = require('node:assert').strict;
const test = require('node:test');
const {throws} = require('node:assert').strict;

const {subscribeToChainSpend} = require('./../../../lnd_methods');

const emptyTx = '01000000000000000000';

const tests = [
  {
    args: {
      min_height: 100,
      output_script: 'a914898ffd60ad6091221250047a9f2bd6456190263487',
      transaction_id: Buffer.alloc(32).toString('hex'),
      transaction_vout: 0,
    },
    description: 'Confirmation emitted for chain spend',
    expected: {height: 200, transaction: emptyTx, vin: 0},
  },
  {
    args: {},
    description: 'An lnd is required',
    error: 'ExpectedLndGrpcApiToSubscribeToSpendConfirmations',
  },
  {
    args: {lnd: {chain: {registerSpendNtfn: () => {}}}},
    description: 'Min height is required',
    error: 'ExpectedMinHeightToSubscribeToChainSpend',
  },
  {
    args: {lnd: {chain: {registerSpendNtfn: () => {}}}, min_height: 1},
    description: 'An address or output script is required',
    error: 'ExpectedRecognizedAddressFormatToWatchForSpend',
  },
];

tests.forEach(({args, description, error, expected}) => {
  return test(description, (t, end) => {
    if (!!error) {
      throws(() => subscribeToChainSpend(args), new Error(error), 'Got error');

      return end();
    }

    const emitter = new EventEmitter();

    args.lnd = {chain: {registerSpendNtfn: ({}) => emitter}};

    const sub = subscribeToChainSpend(args);

    sub.on('confirmation', ({height, transaction, vin}) => {
      strictEqual(height, expected.height, 'Got height');
      strictEqual(transaction, expected.transaction, 'Got transaction');
      strictEqual(vin, expected.vin, 'Got vin');

      return end();
    });

    emitter.emit('data', {
      spend: {
        raw_spending_tx: Buffer.from(emptyTx, 'hex'),
        spending_height: 200,
        spending_input_index: 0,
      },
    });

    return;
  });
});