functional tests broken in Grok 1.2.1

[Ben Caddis]

It seems that either functional tests work in a new, undocumented fashion, or functional test support is broken. I am using Grok 1.2.1 with Python 2.6.1.

This bug does not seem to be related to Bug #677401. I am not having problems with z3c.testsetup.register_all_tests(). That utility finds my test modules without any problems. Unit tests also work as expected.

However, when I try to use a functional test in the same manner described here:
http://grok.zope.org/doc/current/reference/testing.html#functional-test-layer
(exact same code, just replaced the project name) ...I get output like this:

-----
...
File "/home/.../.../GrokTest/src/groktest/test_app_functional.py", line 9, in <module>
    from groktest.testing import FunctionalLayer
ZopeXMLConfigurationError: File "/home/.../.../GrokTest/src/groktest/ftesting.zcml", line 7.2-7.32
    ZopeXMLConfigurationError: File "/home/.../.../GrokTest/src/groktest/configure.zcml", line 5.2-5.27
    ImportError: No module named testing

Running zope.testrunner.layer.UnitTests tests:
  Set up zope.testrunner.layer.UnitTests in 0.000 seconds.
  Running:
.
  Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
Tearing down left over layers:
  Tear down zope.testrunner.layer.UnitTests in 0.000 seconds.

Tests with errors:
   Layer: <zope.app.wsgi.testlayer.BrowserLayer object at 0xb74db74c>
Total: 1 tests, 0 failures, 1 errors in 0.785 seconds.
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[Ben Caddis (nebuloustwo)]

The scope of the discussion in Bug #677401 has grown to include the issue described here. Therefore I'll mark this one as a duplicate to minimize confusion.