ERC777 constructor arguments

For the record, when testing against a development network like ganache or geth --dev you need to use openzeppelin-test-helpers as shown below.

const { singletons } = require('openzeppelin-test-helpers');

contract('ERC777', function (accounts) {
  before(async function () {
    const funder = accounts[0]; // account that will be used to fund the deployment
    await singletons.ERC1820Registry(funder);

  it(...your test here...);
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