message: use test partition, and improve users integration tests for debugging
diff: import { AccountingAPIClient } from '../AccountingAPIClient';
  import { getPrivateConfig, setJestTimeout } from './helpers/integration.helpers';
  -import { UsersResponse } from '../AccountingAPI-types';
  describe('users', () => {
  let xero: AccountingAPIClient;
  - let response: UsersResponse;
  + let existingId: string;
  beforeAll(() => {
  setJestTimeout();
  - const config = getPrivateConfig();
  + const config = getPrivateConfig('1');
  xero = new AccountingAPIClient(config);
  });
  it('get all', async () => {
  - response = await xero.users.get();
  + const response = await xero.users.get();
  expect(response).toBeDefined();
  expect(response.Id).toBeTruthy();
  expect(response.Users.length).toBeGreaterThan(0);
  expect(response.Users[0].UserID).toBeTruthy();
  +
  + existingId = response.Users[0].UserID;
  });
  it('get single', async () => {
  - const singleResponse = await xero.users.get({ UserID: response.Users[0].UserID});
  + const response = await xero.users.get({ UserID: existingId });
  - expect(singleResponse).toBeDefined();
  - expect(singleResponse.Id).toBeTruthy();
  - expect(singleResponse.Users.length).toBe(1);
  - expect(singleResponse.Users[0].UserID).toBeTruthy();
  + expect(response).toBeDefined();
  + expect(response.Id).toBeTruthy();
  + expect(response.Users.length).toBe(1);
  + expect(response.Users[0].UserID).toBeTruthy();
  });
  });
  