Restored some tests that had been inadvertantly disabled in a branh

merge a couple of years ago.  Fortunately, they still pass, so no new
release is indicated.

I didn't restore and removed one silly test class, OneTimeTests,
related to obsolete packing issues.

I didn't restore and removed another silly test class,
DemoStorageWrappedAroundClientStorage, because it is an error to wrap
a demo storage around a client storage. A DemoStorage should only wrap
a storage who's data never changes.

Removed test levels. Test levels are an invitation to inadvertently
not run tests.

src/ZEO/tests/testZEO.py

@@ -24,7 +24,6 @@ from ZODB.tests import StorageTestBase, BasicStorage,  \
      MTStorage, ReadOnlyStorage, IteratorStorage, RecoveryStorage
 from ZODB.tests.MinPO import MinPO
 from ZODB.tests.StorageTestBase import zodb_unpickle
-from ZODB.tests.testDemoStorage import DemoStorageWrappedBase
 
 import asyncore
 import doctest
@@ -59,15 +58,6 @@ class DummyDB:
         pass
 
 
-class OneTimeTests(unittest.TestCase):
-
-    def checkZEOVersionNumber(self):
-        import ZEO
-        # Starting with ZODB 3.4, the ZODB and ZEO version numbers should
-        # be identical.
-        self.assertEqual(ZODB.__version__, ZEO.version)
-
-
 class CreativeGetState(persistent.Persistent):
     def __getstate__(self):
         self.name = 'me'
@@ -267,8 +257,6 @@ class FullGenericTests(
 class FileStorageRecoveryTests(StorageTestBase.StorageTestBase,
                                RecoveryStorage.RecoveryStorage):
 
-    level = 2
-
     def getConfig(self):
         return """\
         <filestorage 1>
@@ -319,7 +307,6 @@ class FileStorageRecoveryTests(StorageTestBase.StorageTestBase,
 
 class FileStorageTests(FullGenericTests):
     """Test ZEO backed by a FileStorage."""
-    level = 2
 
     def getConfig(self):
         return """\
@@ -532,46 +519,6 @@ class ConnectionInvalidationOnReconnect(
         self.assertEqual(db._invalidatedCache, base+1)
     
 
-class DemoStorageWrappedAroundClientStorage(DemoStorageWrappedBase):
-
-    def getConfig(self):
-        return """<mappingstorage 1/>"""
-
-    def _makeBaseStorage(self):
-        logger.info("setUp() %s", self.id())
-        port = get_port(self)
-        zconf = forker.ZEOConfig(('', port))
-        zport, adminaddr, pid, path = forker.start_zeo_server(self.getConfig(),
-                                                              zconf, port)
-        self._pids = [pid]
-        self._servers = [adminaddr]
-        self._conf_path = path
-        _base = ClientStorage(zport, '1', cache_size=20000000,
-                                      min_disconnect_poll=0.5, wait=1,
-                                      wait_timeout=60)
-        _base.registerDB(DummyDB())
-        return _base
-
-    def tearDown(self):
-        DemoStorageWrappedBase.tearDown(self)
-        os.remove(self._conf_path)
-        for server in self._servers:
-            forker.shutdown_zeo_server(server)
-        if hasattr(os, 'waitpid'):
-            # Not in Windows Python until 2.3
-            for pid in self._pids:
-                os.waitpid(pid, 0)
-
-
-test_classes = [OneTimeTests,
-                FileStorageTests,
-                MappingStorageTests,
-                DemoStorageWrappedAroundClientStorage,
-                HeartbeatTests,
-                CatastrophicClientLoopFailure,
-                ConnectionInvalidationOnReconnect,
-               ]
-
 class CommonBlobTests:
 
     def getConfig(self):
@@ -1207,7 +1154,10 @@ slow_test_classes = [
     DemoStorageTests, FileStorageTests, MappingStorageTests,
     ]
     
-quick_test_classes = [FileStorageRecoveryTests, ConfigurationTests]
+quick_test_classes = [
+    FileStorageRecoveryTests, ConfigurationTests, HeartbeatTests,
+    CatastrophicClientLoopFailure, ConnectionInvalidationOnReconnect,
+    ]
 
 class ServerManagingClientStorage(ClientStorage):