merged branch drak/reusable_fixtures (PR #805)

Commits
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36372c6 Made node tests reusable

Discussion
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Reusable tests and fixtures

This PR makes Twig integration testing reusable for 3rd party extensions.

I have implemented resuable functional tests.

The [test runner](https://github.com/zikula/core/blob/master/src/Zikula/Bundle/CoreBundle/Tests/Twig/IntegrationTest.php) and the [fixtures](https://github.com/zikula/core/tree/master/src/Zikula/Bundle/CoreBundle/Tests/Twig/Fixtures) are the only part that an extension needs to implement itself.

I've included documentation in the PR.

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by jusuff at 2012-08-11T20:41:55Z

This PR would make things little easier. Right now tests are organized in confusing way and are hard to implement for Twig extensions

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by drak at 2012-08-14T09:09:45Z

@fabpot - This is ready for merging now. When it's merged I'll update the documentation as this PR significantly eases our ability to test extensions.

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by fabpot at 2012-09-16T14:28:16Z

@drak Do you plan to update this PR with the code you have in Zikula?

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by drak at 2012-09-16T14:37:30Z

@fabpot - Yes, I just need a couple of days (or less).

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by drak at 2012-09-17T12:00:34Z

@fabpot - I have ported over the code.

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by drak at 2012-09-18T08:23:18Z

@fabpot - I updated Zikula to us this particular branch so there is a practical test. I've updated the links in the top description part of this PR with the relevant links. The PR also refactors Twig's core tests to use the re-usable test base classes.

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by fabpot at 2012-09-18T09:01:10Z

@drak Can you squash your commits before I merge? Thanks.

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by drak at 2012-09-18T09:14:08Z

@fabpot - I've squashed them now. Thanks!