add extra paths option for packages that relies on zope 2

src/z3c/recipe/compattest/README.txt

@@ -81,3 +81,25 @@ the ``--foo`` option by default to all generated test runners, you can set
 
 Every options prefixed by ``runner-`` will be automatically passed to the
 generated test runners.
+
+
+Passing Extra paths to the test runners
+=======================================
+
+If you want to add some paths to the generated test runners, you can do it with
+the extra-paths option in the part. This might be interesting if you want to test packages
+that depends on zope2 < 2.12:
+
+>>> write('buildout.cfg', """
+... [buildout]
+... parts = compattest
+...
+... [compattest]
+... recipe = z3c.recipe.compattest
+... include = z3c.recipe.compattest
+... extra-paths = zope2location/lib/python
+... """)
+>>> ignore = system(buildout)
+>>> cat('bin', 'compattest-z3c.recipe.compattest')
+#!...python...
+...zope2location/lib/python...

src/z3c/recipe/compattest/recipe.py

@@ -26,6 +26,7 @@ def __init__(self, buildout, name, options):
 
         self.include = string2list(self.options.get('include', ''), [])
         self.exclude = string2list(self.options.get('exclude', ''), [])
+        self.extra_paths = self.options.get('extra-paths', '')
         self.wanted_packages = self._wanted_packages()
 
         self.script = self.options.get('script', self.name)
@@ -55,6 +56,8 @@ def _install_testrunners(self):
 
             options = self.testrunner_options.copy()
             options['eggs'] = package + extras
+            if self.extra_paths:
+                options['extra-paths'] = self.extra_paths
 
             recipe = zc.recipe.testrunner.TestRunner(
                 self.buildout, '%s-%s' % (self.name, package), options)