I would like to different files for each test

fileupload.js

'use strict';

class FileUpload  {

  upload(path,domain) {

    browser.url(domain);
    browser.waitForExist('.btn-primary', 10000);
    browser.chooseFile('#snapshot_file', path);
    browser.element('#btn-upload').click();

    //browser.ignoreSynchronization = true;
    browser.waitUntil(() => {
            try {
              return browser.alertText() != null;
            }
            catch (error) {
              return false;
            }
          }, 5000);

    browser.alertAccept();
    browser.pause(300);
    browser.waitUntil(() => {
                  try {
                    return browser.alertText() != null;
                  }
                  catch (error) {
                    return false;
                  }
                }, 5000);

    browser.alertAccept();
    //browser.ignoreSynchronization = false;

  }
}

module.exports = new FileUpload();

test-sample2.spec.js

import FileUpload from './../fileupload';
const env = require('../env.js');
const WAIT_TIME = 5000;
const assert = require("power-assert");
describe('login - file upload - startoz', function() {
 beforeEach(function() {
   FileUpload.upload("A.json","xxx");
   console.log("******************************************");
   console.log("FileUpload2");
   console.log("******************************************");

 });
 it('test2', function() {
   browser.waitForExist('.speaker-name', WAIT_TIME + 18000);
   var speakerName =  browser.getHTML('.speaker-name', false);
   assert.equal("xxx", common.omitReactComment(speakerName));
   console.log("******************************************");
   console.log("test2");
   console.log("******************************************");   
 });
});

test-sample3.spec.js

import FileUpload from './../fileupload';
const env = require('../env.js');
const WAIT_TIME = 5000;
const assert = require("power-assert");
describe('login - file upload - startoz', function() {
 beforeEach(function() {
   FileUpload.upload("B.json","xxx");
   console.log("******************************************");
   console.log("FileUpload3");
   console.log("******************************************");

 });
 it('test3', function() {
   browser.waitForExist('.speaker-name', WAIT_TIME + 18000);
   var speakerName =  browser.getHTML('.speaker-name', false);
   assert.equal("xxx", common.omitReactComment(speakerName));
   console.log("******************************************");
   console.log("test3");
   console.log("******************************************");
 });
});

webio.conf.js

const env = require('./src/env.js');
exports.config = {
  specs: [
    __dirname + '/dest/specs/test-sample{2,3}.spec.js'
  ],
  capabilities: [{
    browserName: 'chrome'
  }],
  sync: true,
  logLevel: 'verbose',
  coloredLogs: true,
  screenshotPath: './screenshots/',
  baseUrl: 'https://xx',
  waitforTimeout: 100000,
  connectionRetryTimeout: 100000,
  connectionRetryCount: 3,
  framework: 'mocha',
  reporters: ['dot'],
  mochaOpts: {
    ui: 'bdd',
    timeout: 30000
  },

  before: function (capabilities, specs) {
    browser.url(env.TOP_DOMAIN);
    browser.setValue('input[name=username]', "test");
    browser.setValue('input[name=password]', "password");
    browser.pause(1000);
    browser.getUrl();
    browser.element('button').click();
    browser.getUrl();
    browser.pause(1000);
    browser.url(env.TOP_DOMAIN);
    browser.pause(1000);
  },

}