parsec-node/src/eventsRelay/ContractEventsSubscription.test.js

https://parseclabs.readthedocs.io/en/latest/

const ContractEventsSubscription = require('./ContractEventsSubscription');

const mockWeb3 = blockNumber => ({
  eth: {
    async getBlockNumber() {
      return blockNumber;
    },
  },
});

const mockContract = getPastEvents => ({
  getPastEvents,
});

test('events fetching', async () => {
  let fetched = false;
  const sub = new ContractEventsSubscription(
    mockWeb3(10),
    mockContract((event, options) => {
      expect(event).toBe('allEvents');
      expect(options.fromBlock).toBe(0);
      expect(options.toBlock).toBe(10);
      fetched = true;

      return [];
    })
  );

  await sub.init();

  expect(fetched).toBe(true);
});

test('events fetching from same block', async () => {
  let fetched = false;
  const sub = new ContractEventsSubscription(
    mockWeb3(10),
    mockContract(() => {
      fetched = true;
    }),
    10
  );

  await sub.init();

  expect(fetched).toBe(false);
});

test('init', async () => {
  const contractEvents = [
    { event: 'NewDeposit' },
    { event: 'NewDeposit' },
    { event: 'NewExit' },
  ];
  const sub = new ContractEventsSubscription(
    mockWeb3(10),
    mockContract(() => contractEvents)
  );

  const events = await sub.init();
  expect(events).toEqual(contractEvents);
});

test('emitter', async () => {
  const contractEvents = [
    { event: 'NewDeposit' },
    { event: 'NewDeposit' },
    { event: 'NewExit' },
  ];
  const sub = new ContractEventsSubscription(
    mockWeb3(10),
    mockContract(() => contractEvents)
  );

  let emitted = false;
  sub.on('events', events => {
    emitted = true;
    expect(events).toEqual(contractEvents);
  });

  await sub.init();

  expect(emitted).toBe(true);
});