openzeppelin-contracts/test/proposals/ERC1046/TokenMetadata.test.js

const ERC20WithMetadata = artifacts.require('ERC20WithMetadataMock');

require('chai')
  .use(require('chai-as-promised'))
  .should();

const metadataURI = 'https://example.com';

describe('ERC20WithMetadata', function () {
  before(async function () {
    this.token = await ERC20WithMetadata.new(metadataURI);
  });

  it('responds with the metadata', async function () {
    const got = await this.token.tokenURI();
    got.should.eq(metadataURI);
  });
});