Connections are not closed in tests

[DifferentialOrange]

Connections opened in test_rollback and test_ExceptionsAsConnectionAttributes are opened yet never explicitly closed, which leads to unittest ResourceWarning messages.

dbapi-compliance/dbapi20.py

Lines 181 to 198 in c259a6a

	def test_ExceptionsAsConnectionAttributes(self):
	# OPTIONAL EXTENSION
	# Test for the optional DB API 2.0 extension, where the exceptions
	# are exposed as attributes on the Connection object
	# I figure this optional extension will be implemented by any
	# driver author who is using this test suite, so it is enabled
	# by default.
	con = self._connect()
	drv = self.driver
	_failUnless(self,con.Warning is drv.Warning)
	_failUnless(self,con.Error is drv.Error)
	_failUnless(self,con.InterfaceError is drv.InterfaceError)
	_failUnless(self,con.DatabaseError is drv.DatabaseError)
	_failUnless(self,con.OperationalError is drv.OperationalError)
	_failUnless(self,con.IntegrityError is drv.IntegrityError)
	_failUnless(self,con.InternalError is drv.InternalError)
	_failUnless(self,con.ProgrammingError is drv.ProgrammingError)
	_failUnless(self,con.NotSupportedError is drv.NotSupportedError)

dbapi-compliance/dbapi20.py

Lines 209 to 217 in c259a6a

	def test_rollback(self):
	con = self._connect()
	# If rollback is defined, it should either work or throw
	# the documented exception
	if hasattr(con,'rollback'):
	try:
	con.rollback()
	except self.driver.NotSupportedError:
	pass