Run tests with configurable test-source-directory

[saily]

Basic thoughts

In future people will configure their own content types using dexterity and build their own themes using plone.app.theming - all through the web. So it would be a huge benefit for them if they could just write tests with RIDE or their loved editor and run these tests through plone.act.

Discussion

• Set directory containing test files through zope environment vars. Testers should be able to setup a buildout without writing a line of python code
• We could add environment variable configurable p.a.testing -layer and robot-testsuite in plone.act.

[datakurre]

Except that p.a.testing-based test-layer might not know anything about those through the web made themes and content types. (This would work, though, if it would be trivial to export TTW-done stuff into filesystem so that p.a.testing-layer could find them).

[datakurre]

You can do this now with using act_server and pybot, or just pybot with Zope2ServerLibrary.

E.g. bin/act_server plone.app.testing.PLONE_ZSERVER would give you plain Plone and bin/pybot --listener plone.act.server.ZODB path/to/my/test.txt would allow to run any test suites against it (with test isolation).