Add the function call

testOne.js

const { By, Key, Builder } = require("selenium-webdriver");
require("chromedriver");
 
async function example() {
  //To wait for browser to build and launch properly
  let driver = await new Builder().forBrowser("chrome").build();
 
  try {
    //To go to the test website from the browser with our code.
    await driver.get("http://demo.automationtesting.in/FileDownload.html");
 
    //To enter data inside the text area
    await driver
      .findElement(By.id("textbox"))
      .sendKeys("I love testing!", Key.RETURN);
 
    //To click on "Generate File" button
    await driver.findElement(By.id("createTxt")).click();
 
    //To click on "Download" link
    await driver.findElement(By.id("link-to-download")).click();
 
    //Wait for 5s till download is completed
    await driver.sleep(5000);
  } catch (e) {
    console.log("Error Occured:", e.name);
  }
  //It is always a safe practice to quit the browser after execution
  await driver.quit();
}
 
example();