text: """
  Test cases for PySQLite2-specific parts of the backend.
  """
  
  from pysqlite2.dbapi2 import OperationalError
  
  from twisted.trial.unittest import TestCase
  
  from axiom._pysqlite2 import Connection
  from axiom.test.cursortest import ConnectionTestCaseMixin, StubConnection
  
  
  class PySQLite2StubConnection(StubConnection):
      def timeout(self):
          raise OperationalError('database is locked')
  
  
  class ConnectionTestCase(ConnectionTestCaseMixin, TestCase):
      expectedUnderlyingExceptionClass = OperationalError
  
      def createStubConnection(self, *a, **kw):
          return PySQLite2StubConnection(*a, **kw)
  
  
      def createAxiomConnection(self, underlyingConnection, *a, **kw):
          return Connection(underlyingConnection, *a, **kw)
  
  
      def createRealConnection(self):
          """
          Create a memory-backed connection for integration testing.
          """
          return Connection.fromDatabaseName(":memory:")
  