Stop support for ZODB4

CHANGES.rst

@@ -3,10 +3,10 @@
 Change Log
 ----------
 
-2.5.1 (unreleased)
+2.6.0 (unreleased)
 ~~~~~~~~~~~~~~~~~~
 
-- Nothing changed yet.
+- Stop support for ZODB4
 
 
 2.5.0 (2021-05-12)

docs/index.rst

@@ -7,7 +7,7 @@ Overview
 A library which parses URIs and converts them to ZODB storage objects and
 database arguments.
 
-It will run under CPython 2.7, 3.5 to 3.8, pypy and pypy3.  It will not run under Jython.  It requires ZODB >= 3.10.0.
+It will run under CPython 2.7, 3.5 to 3.8, pypy and pypy3.  It will not run under Jython.  It requires ZODB >= 5.0.0.
 
 Installation
 ------------

tox.ini

 [tox]
 envlist =
-    {py27,py35,py36,pypy,pypy3}-{zodb4,zodb5},
-    {py37,py38}-zodb5,
-    cover,docs,lint
+    py27,py35,py36,py37,py38,pypy,pypy3,cover,docs,lint
 
 [testenv]
 commands =
     python setup.py -q test -q
 deps =
     mock
-    zodb4: ZODB==4.*
-    zodb5: ZODB==5.*
-    zodb4: ZEO==4.*
-    zodb5: ZEO==5.*
+    ZODB==5.*
+    ZEO==5.*
 
 [testenv:cover]
 basepython =

zodburi/tests/test_resolvers.py

@@ -3,9 +3,6 @@ import pkg_resources
 import unittest
 
 
-ZODB_VERSION = tuple(map(int, pkg_resources.get_distribution("ZODB").version.split('.')))
-
-
 class Base:
 
     def test_interpret_kwargs_noargs(self):
@@ -442,16 +439,6 @@ class TestZConfigURIResolver(unittest.TestCase):
         storage = factory()
         from ZODB.MappingStorage import MappingStorage
         self.assertTrue(isinstance(storage, MappingStorage))
-        if ZODB_VERSION[0] < 5:
-            self.assertEqual(dbkw,
-                             {'connection_cache_size': 5000,
-                              'connection_cache_size_bytes': 0,
-                              'connection_historical_cache_size': 1000,
-                              'connection_historical_cache_size_bytes': 0,
-                              'connection_historical_pool_size': 3,
-                              'connection_historical_timeout': 300,
-                              'connection_pool_size': 7})
-        else:
         self.assertEqual(dbkw,
                          {'connection_cache_size': 5000,
                           'connection_cache_size_bytes': 0,
@@ -479,17 +466,6 @@ class TestZConfigURIResolver(unittest.TestCase):
         storage = factory()
         from ZODB.MappingStorage import MappingStorage
         self.assertTrue(isinstance(storage, MappingStorage))
-        if ZODB_VERSION[0] < 5:
-            self.assertEqual(dbkw,
-                             {'connection_cache_size': 20000,
-                              'connection_cache_size_bytes': 0,
-                              'connection_historical_cache_size': 1000,
-                              'connection_historical_cache_size_bytes': 0,
-                              'connection_historical_pool_size': 3,
-                              'connection_historical_timeout': 300,
-                              'connection_pool_size': 5,
-                              'database_name': 'foo'})
-        else:
         self.assertEqual(dbkw,
                          {'connection_cache_size': 20000,
                           'connection_cache_size_bytes': 0,
@@ -546,17 +522,6 @@ class TestZConfigURIResolver(unittest.TestCase):
         storage = factory()
         from ZODB.MappingStorage import MappingStorage
         self.assertTrue(isinstance(storage, MappingStorage))
-        if ZODB_VERSION[0] < 5:
-            self.assertEqual(dbkw,
-                             {'cache_size': 5000,
-                              'cache_size_bytes': 0,
-                              'historical_cache_size': 1000,
-                              'historical_cache_size_bytes': 0,
-                              'historical_pool_size': 3,
-                              'historical_timeout': 300,
-                              'pool_size': 7,
-                              'database_name': 'unnamed'})
-        else:
         self.assertEqual(dbkw,
                          {'cache_size': 5000,
                           'cache_size_bytes': 0,