Cross device test example using interface and factory

AndroidCalculator.java

public AndroidCalculator implements Calculator { //... }

Calculator.java

public interface Calculator {
  WebElement getNumberKey();
  WebElement getPlusKey();
  WebElement getEqualsKey();

  void pressNumber(int number);
  void pressPlusKey();
  void pressEqualsKey();
  //...
}

CalculatorFactory.java

public CalculatorFactory {
  public static Calculator getInstance(WebDriver driver) { ... }
}

CalculatorTests.java

public CalculatorTests {
  Calculator calculator;

  public CalculatorTests(Calculator calculator) {
    this.calculator = calculator;
  }

  @Test
  public void add_two_numbers() {
    calculator.pressNumber(1);
    calculator.pressPlus();
    calculator.pressNumber(2);
    calculator.pressEquals();
    
    int total = Integer.valueOf(calculator.readDisplay());
    
    assertEquals(1+2, total)
  }

  @DataProvider(parallel = true)
  public static Object[][] calculatorProvider() {
    URL sauceUrl = new URL("https://SAUCE_USERNAME:[email protected]:443/wd/hub");
    
    DesiredCapabilities androidCapabilities = new DesiredCapabilities();
    androidCapabilitlies.put("platformName", "Android");
    //...
    
    DesiredCapabilities iphoneCapabilities = new DesiredCapabilities();
    iphoneCapabilitlies.put("platformName", "iOS");
    //...
    
    return new Object[][] {
      new Object[] { new AndroidCalculator(new AndroidDriver(sauceURL, androidCapabilities))},
      new Object[] { new IOSCalculator(new IOSDriver(sauceURL, iphoneCapabilities))}
    }
  };
}

IOSCalculator.java

public IOSCalcuator implements Calculator { //... }

WebCalculator.java

public WebCalcuator implements Calculator { //... }