HtmlUnit is a “GUI-Less browser for Java programs”.
It models HTML documents and provides an API that allows you to invoke pages, fill out forms, click links, etc…
just like you do in your “normal” browser.
It has fairly good JavaScript support (which is constantly improving) and is able to work even with quite complex AJAX libraries,
simulating Chrome, Firefox or Internet Explorer depending on the configuration used.
It is typically used for testing purposes or to retrieve information from web sites.
HtmlUnit is not a generic unit testing framework. It is specifically a way to simulate
a browser for testing purposes and is intended to be used within another testing
framework such as JUnit or TestNG.
Refer to the document “Getting Started with HtmlUnit”
for an introduction.
HtmlUnit is used as the underlying “browser” by different Open Source tools like
Canoo WebTest,
JWebUnit,
WebDriver,
JSFUnit,
WETATOR,
Celerity,
Spring MVC Test HtmlUnit, …
HtmlUnit was originally written by
Mike Bowler of
Gargoyle Software
and is released under the Apache 2 license.
Since then, it has received many contributions from
other developers, and would not be where it is today without their
assistance.
Where to find…
Latest build
Build server (Log in as ‘guest’)
Latest release Feb 28, 2016
version 2.20
Documentation
Javadoc API documentation
Change history
Frequently Asked Questions
HtmlUnit project page on SourceForge.net
HtmlUnit mailing list
HtmlUnit coding conventions
Submitting bugs
Submitting patches
Getting and building the most recent code
Tutorials
Getting Started
Tables
Logging
Windows and frames
Keyboard navigation
Features
- Support for the HTTP and HTTPS protocols
- Support for cookies
- Ability to specify whether failing responses from the server should throw
exceptions or should be returned as pages of the appropriate type (based on content
type)
- Support for submit methods POST and GET (as well as HEAD, DELETE, …)
- Ability to customize the request headers being sent to the server
- Support for HTML responses
- Wrapper for HTML pages that provides easy access to all information
contained inside them
- Support for submitting forms
- Support for clicking links
- Support for walking the DOM model of the HTML document
- Proxy server support
- Support for basic and NTLM authentication
- Excellent JavaScript support (see the JavaScript section below)
Installation
Place all the required jars in your classpath.
All of these can be found in the lib directory of the HtmlUnit installation.
For maven, you would add:
<dependency>
<groupId>net.sourceforge.htmlunit</groupId>
<artifactId>htmlunit</artifactId>
<version>2.20</version>
</dependency>
JavaScript Support
HtmlUnit provides excellent JavaScript support, simulating the behavior of the configured browser (Firefox or Internet Explorer).
It uses the Rhino JavaScript engine for the core language (plus workarounds for some Rhino bugs) and provides the implementation
for the objects specific to execution in a browser.
The unit tests of some well-known JavaScript libraries are included in HtmlUnit’s own unit tests; based on these unit
tests, the following libraries are known to work well with HtmlUnit:
- jQuery 1.8.2: Full support (see unit test here)
- MochiKit 1.4.1: Full support (see unit tests here)
- GWT 2.5.0: Full support (see unit test here)
- Sarissa 0.9.9.3: Full support (see unit test here)
- MooTools 1.2.1: Full support (see unit test here)
- Prototype 1.7.1 (1.6.0, 1.6.1): Very good support (see unit test here)
- Ext JS 2.2: Very good support (see unit test here)
- Dojo 1.0.2: Good support (see unit test here)
- YUI 2.3.0: Good support (see unit test here)
Disabling JavaScript support: to disable JavaScript processing for one WebClient,
call webClient.getOptions().setJavaScriptEnabled(false).
JavaScript code is executed just like in normal browsers when the page loads or when an handler is triggered.
Additionally HtmlUnit provides the ability to inject code into an existing page via
HtmlPage.executeJavascript(String yourJsCode).
Refer to the changes document for details on what is being added.