web-screenshot-by-selenium.groovy

def testScreenshot() {
  System.setProperty("webdriver.chrome.driver", "C:\\Users\\Greg\\Downloads\\chromedriver79.exe")
  new File("screenshot.png").withOutputStream {
      ChromeOptions options = new ChromeOptions()
      options.headless = true
      WebDriver driver = new ChromeDriver(ChromeDriverService.createDefaultService(), options)
      try {
          driver.get("https://www.google.com")
          it.write(driver.getScreenshotAs(OutputType.BYTES))
      } finally {
          driver.close()
          driver.quit()
      }
  }
}