DB.open() doesn't support the `synch` parameter in ZODB 3.8, so this test...

DB.open() doesn't support the `synch` parameter in ZODB 3.8, so this test doesn't make sense anymore (and can be removed)

lib/python/Products/Transience/tests/testCounters.py

-##############################################################################
-#
-# Copyright (c) 2001, 2002 Zope Corporation and Contributors.
-# All Rights Reserved.
-#
-# This software is subject to the provisions of the Zope Public License,
-# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
-# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
-# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
-# FOR A PARTICULAR PURPOSE
-#
-##############################################################################
-
-import os
-from unittest import TestCase, TestSuite, makeSuite
-from ZODB.POSException import ConflictError
-from ZODB.FileStorage import FileStorage
-from ZODB.DB import DB
-import transaction
-
-from Products.Transience.Transience import Length2, Increaser
-
-# Test pattern is copied from BTrees/tests/testConflict.py
-
-class Base(TestCase):
-    storage = None
-
-    def setUp(self):
-        pass
-
-    def tearDown(self):
-        transaction.abort()
-        if self.storage is not None:
-            self.storage.close()
-            self.storage.cleanup()
-
-    def openDB(self):
-        n = 'fs_tmp__%s' % os.getpid()
-        self.storage = FileStorage(n)
-        self.db = DB(self.storage)
-
-class TestLength2(Base):
-
-    def testConflict(self):
-        # Set up database connections to provoke conflict.
-        self.openDB()
-        length = Length2(0)
-
-        r1 = self.db.open().root()
-        r1['ob'] = length
-        transaction.commit()
-
-        r2 = self.db.open(synch=False).root()
-        copy = r2['ob']
-        # The following ensures that copy is loaded.
-        self.assertEqual(copy(),0)
-
-        # First transaction.
-        length.increment(10)
-        length.decrement(1)
-        transaction.commit()
-
-        # Second transaction.
-        length = copy
-        length.increment(20)
-        length.decrement(2)
-        transaction.commit()
-
-        self.assertEqual(length(), 10+20-max(1,2))
-
-class TestIncreaser(Base):
-
-    def testConflict(self):
-
-        # Set up database connections to provoke conflict.
-        self.openDB()
-        increaser = Increaser(0)
-
-        r1 = self.db.open().root()
-        r1['ob'] = increaser
-        transaction.commit()
-
-        r2 = self.db.open(synch=False).root()
-        copy = r2['ob']
-        # The following ensures that copy is loaded.
-        self.assertEqual(copy(),0)
-
-        # First transaction.
-        increaser.set(10)
-        transaction.commit()
-
-
-        # Second transaction.
-        increaser = copy
-        increaser.set(20)
-        transaction.commit()
-
-        self.assertEqual(increaser(), 20)
-
-def test_suite():
-    suite = TestSuite()
-    suite.addTest(makeSuite(TestLength2))
-    suite.addTest(makeSuite(TestIncreaser))
-    return suite