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Headless browser Testing using Selenium HtmlUnitDriver

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Headless browser Testing using Selenium

Hello Welcome to Selenium tutorial, today we will see how to perform Headless browser Testing using Selenium HtmlUnitDriver.

Headless refer which we can’t see on UI.

Headless browser Testing using Selenium

If you have ever worked on Firefox, Chrome, IE browser in Selenium you might have faced so many issues like xpath is changing everytime when a new feature is getting added.Using these browsers, some common issue which I faced during my daily automation like Sync issues and speed as well. Some browser takes the time to load in my experience I faced performance issues with IE browser.

To  increase the speed of your test script i.e. performance of your script we can try some testcases using Headless browser Testing using Selenium.

What is Headless testing/Headless browser in Automation?

Advantage and Disadvantage of headless browsers or Why should I use this?

How to perform Headless testing in Selenium Webdriver using HTMLUnitDriver.

What are the common issues or limitation while working with Headless browsers?

So let us discuss each topic separately.

What is Headless testing/Headless browser in Automation?

Ans-A browser, which does not have any GUI it means which runs in the background. If you run your programs in Firefox, Chrome, IE and the different browser then you can see how the browser is behaving but in headless browsers, you cannot .

Advantage and Disadvantage of headless browsers or Why should I use this?

Ans-One of the most Important advantage is Performance.

1-When we run your test case using headless browsers then you will get the result just in seconds, you will see the result in below program.

2-When we have to run a test case to create some sample test data or just you have to verify some messages and functionality then you can try headless browsers.

3- When we have to run the test case on the remote machine or server, which does not have any browser, but still you have to execute test case then you can try with headless browsers again.

I hope you get the clear picture of this so let us start with some program and output as well.

There is so many headless browsers available in the market, which does the same like Nodejs etc.

When you build your test case using Jenkins then also it runs in Headless mode.

 

Here is the quick video for Headless testing using HTMLUNITDriver

 

 

Headless browser Testing using Selenium

To implement Headless testing selenium have inbuilt class known as

HtmlUnitDriver like other browsers like FirefoxDriver, ChromeDriver etc.

You can find the official https://code.google.com/p/selenium/wiki/HtmlUnitDriver

Before moving to the program, you should have the setup ready. If you have not done setup then no worry use download and Install

Java, Eclipse, Selenium Webdriver Jars, Latest Release

Program-Headless browser Testing using Selenium

package com.bog.htmldemo;

import org.openqa.selenium.By;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.WebElement;

import org.openqa.selenium.htmlunit.HtmlUnitDriver;

public class HtmlDemoProgram1 {

public static void main(String[] args) throws InterruptedException {

// Declaring and initialize  HtmlUnitWebDriver
WebDriver driver = new HtmlUnitDriver();

// open facebook webpage
driver.get("http://www.facebook.com");

// Print the title
System.out.println("Title of the page "+ driver.getTitle());

// find the username field
WebElement username = driver.findElement(By.id("email"));

// enter username
username.sendKeys("mukeshotwani.50@gmail.com");

// find the password field
WebElement password = driver.findElement(By.id("pass"));

// Click the loginbutton
password.sendKeys("pjs@903998");

// find the Sign up button
WebElement Signup_button = driver.findElement(By.id("loginbutton"));

// Click the loginbutton
Signup_button.click();

// wait for 5 second to login
Thread.sleep(5000);

// You will get new title after login
System.out.println("After login title is = " + driver.getTitle());

}}

Output

Title of the page Welcome to Facebook – Log In, Sign Up or Learn More

After login, title is = Facebook

In above program, you will notice it will take only 3-4 seconds to give you the result but if try the same in other browsers it will take 15-20 seconds.

Javascript supports in the HtmlUnitDriver

All the browser which  we are using they use separate javascript engine, but HTMLUnitDriver use Rhino engine so if you will test some javascript applications then chances are high you will get diff results.

By default, JavaScript is disabled in HTMLUnitDriver so you have to enable it while writing the script.

Two ways to enable javascript in HTMLUnitDriver

First- setJavascriptEnabled method to true

WebDriver driver = new HtmlUnitDriver();

driver.setJavascriptEnabled(true);

 Second- While initializing browser itself you can enable. 

HtmlUnitDriver driver = new HtmlUnitDriver(true);

Thanks for visiting my blog. Keep in touch.

Have a nice day 🙂

Reader Interactions

Comments

  1. Kavya Chitra says

    Hi Mukesh,

    I am using HtmlUnit for headless browser, it is not detecting some Elements like Button. Whereas with WebDriver the test is executing. Plz help me on this.

    Reply

  2. Hari says

    Hi,
    Nice article and it is very useful for all selenium testers.
    I executed my code as per your suggetions with HtmlUnitDriver. Thank you very much

    Reply

  4. Lae says

    Hi Mukesh,

    On you script everything appears fine. But, on my package Test;. It’s seem to have an error. It wanted for me to import The type org.openqa.selenium.HasInputDevices cannot be resolved. It is indirectly referenced from required .class .

    Now, what is that?

    Reply

  5. Suman says

    Hi Mukesh,

    I am using Angular JS application and I am trying to fetch the data from table then it is showing error message saying that “Element not visible”.
    Can you please help me on this.

    Reply

  6. Naresh says

    Hi Mukesh,
    I am using phantomjs for Headless browser testing.

    Q: How handle the alert message in headless browser ?

    Reply

  8. Naveen says

    Hi Mukesh,
    When I tried to print result page in google using following code.it is not printing any value. please suggest any changes it current code
    DesiredCapabilities capabilities = DesiredCapabilities.htmlUnit();
    capabilities.setBrowserName(BrowserType.FIREFOX);
    HtmlUnitDriver driver = new HtmlUnitDriver(capabilities);
    driver = new HtmlUnitDriver(capabilities);
    driver.setJavascriptEnabled(false);
    driver.get(“http://www.google.com”);
    WebElement element = driver.findElement(By.name(“q”));
    element.sendKeys(“uber”);
    element.submit();
    WebElement webElement = driver.findElement(By.xpath(“/html”));
    // WebElement webElement = driver.findElement(By.xpath(“/html”));
    String str=webElement.getAttribute(“outerHTML”);
    // String str= webElement.getAttribute(“outerHTML”);
    System.out.println(str);

    output:
    null

    Thanks
    Naveen

    Reply

  9. Arpitha says

    hi Mukesh,

    I am facing problem in headless browser testing. The application is built using Angular JS, when i do the headless testing for the application – the script will launch the browser but it fails to load the page, as i can see in the logs “unable to locate web element “. Could you please help me in resolving this.

    Reply

  10. Swatik Panda says

    Hi MUkesh,
    Thanks for this fine article on Headless browser .
    I am getting following error
    driver = new HtmlUnitDriver(BrowserVersion.FIREFOX_38);
    ((HtmlUnitDriver)driver).setJavascriptEnabled(true);

    Output:
    ———-
    Mar 28, 2016 11:38:38 AM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
    WARNING: Invalid base url: “/”, ignoring it
    Mar 28, 2016 11:38:39 AM com.gargoylesoftware.htmlunit.javascript.StrictErrorReporter runtimeError
    SEVERE: runtimeError: message=[An invalid or illegal selector was specified (selector: ‘*,:x’ error: Invalid selector: *:x).] sourceName=[https://stage.xyz.net/sf/js/jquery/jquery.js] line=[4] lineSource=[null] lineOffset=[0]
    Mar 28, 2016 11:38:39 AM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
    WARNING: Invalid base url: “/”, ignoring it
    Mar 28, 2016 11:38:39 AM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
    WARNING: Invalid base url: “/”, ignoring it
    Mar 28, 2016 11:38:40 AM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
    WARNING: Invalid base url: “/”, ignoring it
    Mar 28, 2016 11:38:40 AM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
    WARNING: Invalid base url: “/”, ignoring it
    Mar 28, 2016 11:38:40 AM com.gargoylesoftware.htmlunit.IncorrectnessListenerImpl notify
    WARNING: Invalid base url: “/”, ignoring it

    Note : I have disabled all the listners in xml .

    Reply

  11. Tony says

    any limitation of HTMLunitTest Driver it may be? i.e. support the same behavior of IE, Firefox or Chrome? thanks the sharing.

    Reply

  15. Madiraju Krishna Chaitanya says

    Hi Mukesh Ji,Nice Program.I want to highlight a small correction in the comments section in the above program that you have written.In the Line Number: 33 you have given it as “// Click the loginbutton” for the password being entered code, written below(Line Number: 34).Please correct the comment something as “enter password”. The rest of the is working fine, as designed.Thank You for your valuable time and for sharing your knowledge and experience.

    Reply

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