Error regarding variable in Selenium Junit test : I'm trying to run below code from IntelliJ but in turns an error (below). I just want to click a button on the website using a Xpath locator and adding an assertion to validate my test. What is the best approach to build such a simple test?

```package selenium;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.testng.annotations.Test;
import java.util.List;

public class ButtonTest extends CommonScenario {

  private static WebDriver driver;

  @Test()
  public void button_test() {
    button b = driver.findElements(By.xpath("//button[text()='Teleworking"));
  }
```

Error:
``` 
Error:(16, 5) java: cannot find symbol
      symbol:   class button
      location: class selenium.ButtonTest