--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rhodecode/tests/vcs/base.py	Wed Jun 13 23:27:33 2012 +0200
@@ -0,0 +1,111 @@
+"""
+Module providing backend independent mixin class. It requires that
+InMemoryChangeset class is working properly at backend class.
+"""
+import os
+from rhodecode.lib import vcs
+import time
+import shutil
+import datetime
+from rhodecode.lib.vcs.utils.compat import unittest
+
+from conf import SCM_TESTS, get_new_dir
+
+from rhodecode.lib.vcs.nodes import FileNode
+
+
+class BackendTestMixin(object):
+    """
+    This is a backend independent test case class which should be created
+    with ``type`` method.
+
+    It is required to set following attributes at subclass:
+
+    - ``backend_alias``: alias of used backend (see ``vcs.BACKENDS``)
+    - ``repo_path``: path to the repository which would be created for set of
+      tests
+    - ``recreate_repo_per_test``: If set to ``False``, repo would NOT be created
+      before every single test. Defaults to ``True``.
+    """
+    recreate_repo_per_test = True
+
+    @classmethod
+    def get_backend(cls):
+        return vcs.get_backend(cls.backend_alias)
+
+    @classmethod
+    def _get_commits(cls):
+        commits = [
+            {
+                'message': u'Initial commit',
+                'author': u'Joe Doe <joe.doe@example.com>',
+                'date': datetime.datetime(2010, 1, 1, 20),
+                'added': [
+                    FileNode('foobar', content='Foobar'),
+                    FileNode('foobar2', content='Foobar II'),
+                    FileNode('foo/bar/baz', content='baz here!'),
+                ],
+            },
+            {
+                'message': u'Changes...',
+                'author': u'Jane Doe <jane.doe@example.com>',
+                'date': datetime.datetime(2010, 1, 1, 21),
+                'added': [
+                    FileNode('some/new.txt', content='news...'),
+                ],
+                'changed': [
+                    FileNode('foobar', 'Foobar I'),
+                ],
+                'removed': [],
+            },
+        ]
+        return commits
+
+    @classmethod
+    def setUpClass(cls):
+        Backend = cls.get_backend()
+        cls.backend_class = Backend
+        cls.repo_path = get_new_dir(str(time.time()))
+        cls.repo = Backend(cls.repo_path, create=True)
+        cls.imc = cls.repo.in_memory_changeset
+
+        for commit in cls._get_commits():
+            for node in commit.get('added', []):
+                cls.imc.add(FileNode(node.path, content=node.content))
+            for node in commit.get('changed', []):
+                cls.imc.change(FileNode(node.path, content=node.content))
+            for node in commit.get('removed', []):
+                cls.imc.remove(FileNode(node.path))
+            
+            cls.tip = cls.imc.commit(message=unicode(commit['message']),
+                                     author=unicode(commit['author']),
+                                     date=commit['date'])
+
+    @classmethod
+    def tearDownClass(cls):
+        if not getattr(cls, 'recreate_repo_per_test', False) and \
+            'VCS_REMOVE_TEST_DIRS' in os.environ:
+            shutil.rmtree(cls.repo_path)
+
+    def setUp(self):
+        if getattr(self, 'recreate_repo_per_test', False):
+            self.__class__.setUpClass()
+
+    def tearDown(self):
+        if getattr(self, 'recreate_repo_per_test', False) and \
+            'VCS_REMOVE_TEST_DIRS' in os.environ:
+            shutil.rmtree(self.repo_path)
+
+
+# For each backend create test case class
+for alias in SCM_TESTS:
+    attrs = {
+        'backend_alias': alias,
+    }
+    cls_name = ''.join(('%s base backend test' % alias).title().split())
+    bases = (BackendTestMixin, unittest.TestCase)
+    globals()[cls_name] = type(cls_name, bases, attrs)
+
+
+if __name__ == '__main__':
+    unittest.main()