Re: [stellation-res] Something helpful for writing tests...

[Rafal Krzewski <rafal.krzewski@xxxxxxxxx>]

Mark C. Chu-Carroll wrote:

> Just found this while doing some web-browsing. It's a very neat idea 
> called mock objects for helping to write unit tests for complex 
> systems.  There's a very nice looking implementation of it for JUnit 
> called JMock, at jmock.org, which is distributed under a very friendly 
> BSD style license.  There's also a very short tutorial there to give 
> you the sense of what mock objects are for, at
> http://jmock.org/getting-started.html.
>
> I think this could make our lives significantly easier when it comes 
> to a lot of the kinds of testing
> that we really need to do.

I happen to be an user of jMock for about one month and I must say that 
it really brought my testing to a new level!  Now I'm able to do proper 
unit tests, testing one class at a time.
I have a little tip that'll hopefuly save you a bit of frustration: 
org.jmock.Mock can mock only interfaces. If your code is not 
interface/implementation separated, there is an extension that enables 
you to mock concrete classes too (they need to have protected or public 
no-arg constructor for that), it's in extensions/cglib in jMock source.

If you wish to take a look at more examples of jMock usage, here's my 
project's base testcase (jMock stuff at the bottom):
http://objectledge.org/viewcvs.cgi/ledge-components/src/main/java/org/objectledge/utils/LedgeTestCase.java?rev=HEAD&content-type=text/vnd.viewcvs-markup

And here's one of my jMock unit tests:
http://coral.objectledge.org/viewcvs.cgi/coral-maven-plugin/src/test/java/org/objectledge/coral/tools/generator/model/ResourceClassTest.java?rev=HEAD&content-type=text/vnd.viewcvs-markup

Other tools that I find extremely useful are Clover - test coverage 
reportnig tool (commercial, but OS projects are granted gratis 
licenses), example report:
http://objectledge.org/modules/ledge-components/clover/index.html

And Maven itself, unfortunately there is no plugin for generating 
Eclipse plugins, features and update sites that I know of, so it may be 
not so useful to you, example report:
http://objectledge.org/modules/ledge-components/

R.