Background
Selenium is a portable Browser automation framework for web applications. Selenium provides a record/playback tool called Selenium Remote Control (RC) that runs your tests in multiple browsers and platforms for authoring tests without learning a test scripting language. Selenium also provides Firefox add-on that records clicks, typing, and other actions to make a test, which you can play back in the browser, known as Selenium IDE.
But in this article, I am going to demonstrate how to use Selenium Java WebDriver API to automate your web application or any third party web application.
Create a Simple Web Application
First of all, you need to have a web application in place which you want to test. Let’s assume you have an existing application like I am going to show you now. In this application, the users have to enter their name to go to the welcome page and then they can go back to the input page. Refer to the screenshots of the application:
Index Page Screenshot
Welcome Page Screenshot
In the following sections, you will find how to test all highlighted portions of the screenshot using JUnit and Selenium. The code of this sample web application is listed as below:
="1.0"="ISO-8859-1"
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Enter your name</title>
</head>
<body>
<h3>Please enter your name</h3>
<form action="./UserNameServlet" method="post">
<table>
<tr>
<th>Name:</th>
<th><input name="userName" type="text" /></th>
</tr>
<tr>
<td colspan="2" align="right"><input type="submit" value="submit"/>
</td>
</tr>
</table>
</form>
</body>
</html>
Source Code of index.jsp
package blog.selenium;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class UserNameServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
processRequest(request,response);
}
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
processRequest(request,response);
}
private void processRequest(HttpServletRequest request,
HttpServletResponse response) throws IOException, ServletException{
String userName = request.getParameter("userName");
HttpSession session = request.getSession();
session.setAttribute("userName", userName);
request.getRequestDispatcher("welcome.jsp").forward(request, response);
}
}
Source Code of UserNameServlet.java
<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Welcome Page</title>
</head>
<body>
<h3 align="center">Welcome ${userName}!!!</h3>
<a href="index.jsp">go back</a>
</body>
</html>
Source Code of welcome.jsp
Before you are going to write test cases, make sure the application you want to test is up and running.
Test Web Application Using JUnit and Selenium
Before I illustrate the code of how to test the UI, let’s understand the core Selenium classes which are used most frequently to write test cases.
org.openqa.selenium.WebDriver: The main interface to use for testing, which represents an idealised web browser. The methods in this class fall into three categories – Control of the browser itself, Selection of WebElements, Debugging aids org.openqa.selenium.WebElement: Represents an HTML element. Generally, all interesting operations to do with interacting with a page will be performed through this interface. org.openqa.selenium.By: Mechanism used to locate elements within a document.
import static org.hamcrest.Matchers.equalTo;
import static org.junit.Assert.assertThat;
import org.junit.Before;
import org.junit.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.htmlunit.HtmlUnitDriver;
public class TestEndToEndPages {
private WebDriver driver;
@Before
public void setUp() {
driver = new HtmlUnitDriver();
driver.get("http://localhost:6060/WebApplication4Selenium");
}
@Test
public void shouldBeAbleEnterUserNameAndClickSubmitToVerifyWelcomeMessage()
{
verifyTitle("Enter your name");
verifyHeaderMessage("Please enter your name");
enterUserName("Allen");
verifyTitle("Welcome");
verifyHeaderMessage("Welcome Allen!!!");
backToPreviousPage("go back");
verifyTitle("Enter your name");
}
private void verifyTitle(String expectedTitle) {
String actualTitle = driver.getTitle();
assertThat(actualTitle, equalTo(expectedTitle));
}
private void verifyHeaderMessage(String expectedHeaderMessage) {
WebElement element = driver.findElement(By.tagName("h3"));
String actualHeaderMessage = element.getText();
assertThat(actualHeaderMessage, equalTo(expectedHeaderMessage));
}
private void enterUserName(String userName) {
WebElement element = driver.findElement(By.name("userName"));
element.sendKeys(userName);
element.submit();
}
private void backToPreviousPage(String expectedLinkText) {
WebElement element = driver.findElement(By.id("back"));
String actualLinkText = element.getText();
assertThat(actualLinkText, equalTo(expectedLinkText));
element.click();
}
}
Source Code of TestEndToEndPages.java
If you look closely at the comments in the above mentioned test class, you will be able to find how you can navigate to a page or how you can find an element to perform certain operations like get the text, set a value, trigger any event, etc.
Resources
This is very basic but a workable example that shows you how to use selenium for your web application’s UI automation. For more information, you can visit the official selenium sites listed below:
- Download Selenium IDE, RC etc.: http://seleniumhq.org
- Google code base for Selenium: http://code.google.com/p/selenium/
- Documentation of Selenium JAVA API: http://wiki.openqa.org/display/SEL/Home
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