Parent base class for all webdriver test. Logic to create instance of webdriver and clean up webdriver.

ElementData.java

package com.eternussolutions;

import org.openqa.selenium.By;
import java.util.HashMap;

public class ElementData {
	public String value;
	public By selector;
	public HashMap<String,By> selectors;
	public String triggerEvent;

	{
		selectors = new HashMap<String,By>(); 
	}
}

PageObjectModel.java

package com.eternussolutions;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;

public class PageObjectModel {
		
		public static final String CLICK_EVENT = "click";
		public static final String HOVER_EVENT = "hover";
	
		//	instance variables
		WebDriver driver;
		String baseURL;
		
		public PageObjectModel(WebDriver webDriverP,String baseURLP){
			this.driver	  = webDriverP;
			this.baseURL  = baseURLP;
		}
	
	    //generic helper methods start
		protected void clearInput(By selector){
			driver.findElement(selector).clear();
		}
		
		protected void setValue(By selector, String value){
			// does work of driver.findElement(By.id("ainput")).sendKeys("10");
			driver.findElement(selector).sendKeys(value);
		}
		
		protected String getInputFieldValue(By selector) {
			// does work of driver.findElement(By.id("coutput")).getAttribute("value")
			String inputFieldValue = driver.findElement(selector).getAttribute("value");
			return inputFieldValue;
		}
		
		protected Boolean isVisible(By selector){
			//if(driver.)
			return true;
		}
		
		protected void triggerEvent(By selector,String event) {
			if(CLICK_EVENT.equalsIgnoreCase(event)){
				driver.findElement(selector).click();
			} else if(HOVER_EVENT.equalsIgnoreCase(event)){
				
			}
		}	
		//generic helper methods stop
}

testng.xml

<?xml version="1.0" encoding="UTF-8"?>
<suite name="Suite" parallel="tests">
  <!-- Test Suite Level Parameters -->
  <parameter name="baseUrl" value="http://swapnilshrikhande.github.io/" />

  <test name="FireFoxTest">
  		<!-- Test Level Parameters -->
    	<parameter name="browser" value="firefox" />
	    <classes>
	      <class name="com.eternussolutions.AdditionTest"/>
	    </classes>
  </test>
  
  <test name="ChromeTest">
	  	<!-- Test Level Parameters -->
    	<parameter name="browser" value="chrome" />
	    <classes>
	      <class name="com.eternussolutions.AdditionTest"/>
	    </classes>
  </test>
  
  <test name="IETest">
	  	<!-- Test Level Parameters -->
    	<parameter name="browser" value="ie" />
	    <classes>
	      <class name="com.eternussolutions.AdditionTest"/>
	    </classes>
  </test>
  
  <!-- Test -->
</suite> <!-- Suite -->

WebDriverTest.java

package com.eternussolutions;

import static org.testng.Assert.fail;

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.Alert;
import org.openqa.selenium.By;
import org.openqa.selenium.NoAlertPresentException;
import org.openqa.selenium.NoSuchElementException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.ie.InternetExplorerDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Parameters;

public class WebDriverTest {
	protected boolean acceptNextAlert = true;
	protected StringBuffer verificationErrors = new StringBuffer();
	protected WebDriver driver;
	protected String baseUrl;
	
	@Parameters({"browser","baseUrl"})
	@BeforeClass(alwaysRun = true)
	public void setUp(String browser,String baseUrlProperty) throws Exception {
		initialize(browser,baseUrlProperty);
	}
	
	protected WebDriver getWebdriver(String browser){
		  WebDriver driver = null;
		  // If the browser is Firefox, then do this
		  if(browser.equalsIgnoreCase("firefox")) {
			  System.setProperty("webdriver.gecko.driver", "drivers\\geckodriver.exe");
			  driver = new FirefoxDriver();
		  } else if (browser.equalsIgnoreCase("chrome")){
			  System.setProperty("webdriver.chrome.driver", "drivers\\chromedriver.exe");
			  driver = new ChromeDriver();
		  } else if (browser.equalsIgnoreCase("ie")) { 
		 	  System.setProperty("webdriver.ie.driver", "drivers\\IEDriverServer.exe");
		 	  DesiredCapabilities capabilities = DesiredCapabilities.internetExplorer();    
		 	  capabilities.setCapability(InternetExplorerDriver.INTRODUCE_FLAKINESS_BY_IGNORING_SECURITY_DOMAINS,true);
		 	  driver = new InternetExplorerDriver(capabilities);
		  }
		  return driver;
	 }
	
	
	protected void initialize(String browser,String baseUrlProperty){
		baseUrl = baseUrlProperty;
		driver  	  = getWebdriver(browser);
	    driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
	}
	
	@AfterClass(alwaysRun = true)
	public void tearDown() throws Exception {
		cleanUp();
	}
	
	protected void cleanUp(){
		
		driver.quit();
	    String verificationErrorString = verificationErrors.toString();
	    if (!"".equals(verificationErrorString)) {
	      fail(verificationErrorString);
	    }
		
	}
	
	//Common Utility Methods
	  private boolean isElementPresent(By by) {
	    try {
	      driver.findElement(by);
	      return true;
	    } catch (NoSuchElementException e) {
	      return false;
	    }
	  }

	  private boolean isAlertPresent() {
	    try {
	      driver.switchTo().alert();
	      return true;
	    } catch (NoAlertPresentException e) {
	      return false;
	    }
	  }

	  private String closeAlertAndGetItsText() {
	    try {
	      Alert alert = driver.switchTo().alert();
	      String alertText = alert.getText();
	      if (acceptNextAlert) {
	        alert.accept();
	      } else {
	        alert.dismiss();
	      }
	      return alertText;
	    } finally {
	      acceptNextAlert = true;
	    }
	}
	
}