botbuilder-unit.js
function resolveBot(bot) {
  let isWaterfall = ("function" == typeof bot) || Array.isArray(bot);
  if (isWaterfall) {
    let dialog = bot;
    let connector = new TestConnector();
    bot = new builder.UniversalBot(connector);
    bot.dialog('/', dialog);
  } else if (bot instanceof builder.UniversalBot) {
    if ( !bot.connector()) {
      bot.connector('console', new TestConnector());
    }
  } else {
    throw new Error(`Unknown type of bot/dialog. Error: ${JSON.stringify(bot)}`);
  }
  return bot;
}
function resolveBot(bot) {
  let isWaterfall = ("function" == typeof bot) || Array.isArray(bot);
  if (isWaterfall) {
    let dialog = bot;
    let connector = new TestConnector();
    bot = new builder.UniversalBot(connector);
    bot.dialog('/', dialog);
  } else if (bot instanceof builder.UniversalBot) {
    if ( !bot.connector()) {
      bot.connector('console', new TestConnector());
    }
  } else {
    throw new Error(`Unknown type of bot/dialog. Error: ${JSON.stringify(bot)}`);
  }
  return bot;
}
Wraps arrays and functions into instance of UniversalBot
Ensure that given bot has connector, otherwise inject TestConnector

@param bot
@returns {*}