If you look at the download statistics of HtmlUnit and HttpUnit at Sourceforge (here for HtmlUnit and here for HttpUnit), you’ll see that HttpUnit still has more downloads than HtmlUnit. This is quite surprising when you have some knowledge of both libraries and particularly of the fact that HttpUnit is deeply asleep since so many years (the recent 1.7 release doesn’t really change the deal).
In his blog post “HtmlUnit vs HttpUnit“, Daniel Gredler wrote “HttpUnit is to the web app testing world what Struts is to the web app framework world: there are many “better” options out there, but it just won’t go away!“. I totally agree but it is interesting to examine the reasons why it doesn’t go away. I believe that one element of the answer is that many “experts” have outdated knowledge in this domain and still talk about HttpUnit.
- Rod Johnson
In “System Integration Testing Using Spring” at the The Spring Experience conference, Rod talked about HttpUnit but not about HtmlUnit.
The JBoss project JSFUnit contains HttpUnit not HtmlUnit.
Nevertheless it seems that in this case the mistake has been identified as a feature request “Investigate replacing HttpUnit with HtmlUnit” already exists.
- Recent books
Different recent books mention HttpUnit but not HtmlUnit, like for instance Java Power Tools (by John Ferguson Smart), Test Driven, Practical TDD and Acceptance TDD for Java Developers (by Lasse Koskela), or Ant in Action, 2nd Edition (by Steve Loughran and Erik Hatcher). In this latest case, rather than HtmlUnit, they should probably have written about WebTest as it is probably the tool – web testing or not – that makes the most intensive usage of Ant.
Why did all these famous developers talk / write about HttpUnit? My guess is simply that functional tests of web applications are not their favorite field of expertise and therefore that they didn’t update their knowledge in this area since a – too – long time.
I see two consequences. First it gives a bad impression on the whole presented content: no matter how good it may be, when you detect outdated areas, you start to question the rest. Second, it influences newcomers that have no idea of the domain and this can be a good explaination for HttpUnit surprising high download numbers.