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.
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It has fairly good JavaScript support (which is constantly improving) and is
able to work even with quite complex AJAX libraries, simulating either Firefox
or Internet Explorer depending on the configuration you want to use.
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It is typically used for testing purposes or to retrieve information from web
sites.
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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.
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This package contains the JavaScript intepreter, based on the Rhino engine.