Files
python-ganttclient/nova/tests/test_migrations.py
Kurt Taylor af80c50edc Add and check data functions for test_migrations 141
Before the 141 migration test is run, _prerun_141 populates the migrations
table with a generated uuid. The _check_141 function checks that
the uuid migrated properly down to 36 char.

Partially implements: blueprint migration-testing-with-data

Change-Id: I43b47f69a94720bf9487eb30576035493700ddca
2013-02-18 08:51:19 -05:00

725 lines
30 KiB
Python

# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2010-2011 OpenStack, LLC
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
Tests for database migrations. This test case reads the configuration
file test_migrations.conf for database connection settings
to use in the tests. For each connection found in the config file,
the test case runs a series of test cases to ensure that migrations work
properly both upgrading and downgrading, and that no data loss occurs
if possible.
There are also "opportunistic" tests for both mysql and postgresql in here,
which allows testing against all 3 databases (sqlite in memory, mysql, pg) in
a properly configured unit test environment.
For the opportunistic testing you need to set up a db named 'openstack_citest'
with user 'openstack_citest' and password 'openstack_citest' on localhost.
The test will then use that db and u/p combo to run the tests.
For postgres on Ubuntu this can be done with the following commands:
sudo -u postgres psql
postgres=# create user openstack_citest with createdb login password
'openstack_citest';
postgres=# create database openstack_citest with owner openstack_citest;
"""
import collections
import commands
import ConfigParser
import datetime
import os
import sqlalchemy
import urlparse
import uuid
from migrate.versioning import repository
import nova.db.migration as migration
import nova.db.sqlalchemy.migrate_repo
from nova.db.sqlalchemy.migration import versioning_api as migration_api
from nova.openstack.common import log as logging
from nova.openstack.common import timeutils
from nova import test
LOG = logging.getLogger(__name__)
def _get_connect_string(backend,
user="openstack_citest",
passwd="openstack_citest",
database="openstack_citest"):
"""
Try to get a connection with a very specific set of values, if we get
these then we'll run the tests, otherwise they are skipped
"""
if backend == "postgres":
backend = "postgresql+psycopg2"
elif backend == "mysql":
backend = "mysql+mysqldb"
return ("%(backend)s://%(user)s:%(passwd)s@localhost/%(database)s"
% locals())
def _is_backend_avail(backend,
user="openstack_citest",
passwd="openstack_citest",
database="openstack_citest"):
try:
if backend == "mysql":
connect_uri = _get_connect_string("mysql",
user=user, passwd=passwd, database=database)
elif backend == "postgres":
connect_uri = _get_connect_string("postgres",
user=user, passwd=passwd, database=database)
engine = sqlalchemy.create_engine(connect_uri)
connection = engine.connect()
except Exception:
# intentionally catch all to handle exceptions even if we don't
# have any backend code loaded.
return False
else:
connection.close()
engine.dispose()
return True
def _have_mysql():
present = os.environ.get('NOVA_TEST_MYSQL_PRESENT')
if present is None:
return _is_backend_avail('mysql')
return present.lower() in ('', 'true')
def get_table(engine, name):
"""Returns an sqlalchemy table dynamically from db.
Needed because the models don't work for us in migrations
as models will be far out of sync with the current data."""
metadata = sqlalchemy.schema.MetaData()
metadata.bind = engine
return sqlalchemy.Table(name, metadata, autoload=True)
class BaseMigrationTestCase(test.TestCase):
"""Base class fort testing migrations and migration utils."""
DEFAULT_CONFIG_FILE = os.path.join(os.path.dirname(__file__),
'test_migrations.conf')
# Test machines can set the NOVA_TEST_MIGRATIONS_CONF variable
# to override the location of the config file for migration testing
CONFIG_FILE_PATH = os.environ.get('NOVA_TEST_MIGRATIONS_CONF',
DEFAULT_CONFIG_FILE)
MIGRATE_FILE = nova.db.sqlalchemy.migrate_repo.__file__
REPOSITORY = repository.Repository(
os.path.abspath(os.path.dirname(MIGRATE_FILE)))
def setUp(self):
super(BaseMigrationTestCase, self).setUp()
self.snake_walk = False
self.test_databases = {}
# Load test databases from the config file. Only do this
# once. No need to re-run this on each test...
LOG.debug('config_path is %s' % BaseMigrationTestCase.CONFIG_FILE_PATH)
if os.path.exists(BaseMigrationTestCase.CONFIG_FILE_PATH):
cp = ConfigParser.RawConfigParser()
try:
cp.read(BaseMigrationTestCase.CONFIG_FILE_PATH)
defaults = cp.defaults()
for key, value in defaults.items():
self.test_databases[key] = value
self.snake_walk = cp.getboolean('walk_style', 'snake_walk')
except ConfigParser.ParsingError, e:
self.fail("Failed to read test_migrations.conf config "
"file. Got error: %s" % e)
else:
self.fail("Failed to find test_migrations.conf config "
"file.")
self.engines = {}
for key, value in self.test_databases.items():
self.engines[key] = sqlalchemy.create_engine(value)
# We start each test case with a completely blank slate.
self._reset_databases()
def tearDown(self):
# We destroy the test data store between each test case,
# and recreate it, which ensures that we have no side-effects
# from the tests
self._reset_databases()
super(BaseMigrationTestCase, self).tearDown()
def _reset_databases(self):
def execute_cmd(cmd=None):
status, output = commands.getstatusoutput(cmd)
LOG.debug(output)
self.assertEqual(0, status)
for key, engine in self.engines.items():
conn_string = self.test_databases[key]
conn_pieces = urlparse.urlparse(conn_string)
engine.dispose()
if conn_string.startswith('sqlite'):
# We can just delete the SQLite database, which is
# the easiest and cleanest solution
db_path = conn_pieces.path.strip('/')
if os.path.exists(db_path):
os.unlink(db_path)
# No need to recreate the SQLite DB. SQLite will
# create it for us if it's not there...
elif conn_string.startswith('mysql'):
# We can execute the MySQL client to destroy and re-create
# the MYSQL database, which is easier and less error-prone
# than using SQLAlchemy to do this via MetaData...trust me.
database = conn_pieces.path.strip('/')
loc_pieces = conn_pieces.netloc.split('@')
host = loc_pieces[1]
auth_pieces = loc_pieces[0].split(':')
user = auth_pieces[0]
password = ""
if len(auth_pieces) > 1:
if auth_pieces[1].strip():
password = "-p\"%s\"" % auth_pieces[1]
sql = ("drop database if exists %(database)s; "
"create database %(database)s;") % locals()
cmd = ("mysql -u \"%(user)s\" %(password)s -h %(host)s "
"-e \"%(sql)s\"") % locals()
execute_cmd(cmd)
elif conn_string.startswith('postgresql'):
database = conn_pieces.path.strip('/')
loc_pieces = conn_pieces.netloc.split('@')
host = loc_pieces[1]
auth_pieces = loc_pieces[0].split(':')
user = auth_pieces[0]
password = ""
if len(auth_pieces) > 1:
password = auth_pieces[1].strip()
# note(krtaylor): File creation problems with tests in
# venv using .pgpass authentication, changed to
# PGPASSWORD environment variable which is no longer
# planned to be deprecated
os.environ['PGPASSWORD'] = password
os.environ['PGUSER'] = user
# note(boris-42): We must create and drop database, we can't
# drop database which we have connected to, so for such
# operations there is a special database template1.
sqlcmd = ("psql -w -U %(user)s -h %(host)s -c"
" '%(sql)s' -d template1")
sql = ("drop database if exists %(database)s;") % locals()
droptable = sqlcmd % locals()
execute_cmd(droptable)
sql = ("create database %(database)s;") % locals()
createtable = sqlcmd % locals()
execute_cmd(createtable)
os.unsetenv('PGPASSWORD')
os.unsetenv('PGUSER')
class TestMigrations(BaseMigrationTestCase):
"""Test sqlalchemy-migrate migrations."""
def test_walk_versions(self):
"""
Walks all version scripts for each tested database, ensuring
that there are no errors in the version scripts for each engine
"""
for key, engine in self.engines.items():
self._walk_versions(engine, self.snake_walk)
def test_mysql_connect_fail(self):
"""
Test that we can trigger a mysql connection failure and we fail
gracefully to ensure we don't break people without mysql
"""
if _is_backend_avail('mysql', user="openstack_cifail"):
self.fail("Shouldn't have connected")
def test_mysql_opportunistically(self):
# Test that table creation on mysql only builds InnoDB tables
if not _is_backend_avail('mysql'):
self.skipTest("mysql not available")
# add this to the global lists to make reset work with it, it's removed
# automatically in tearDown so no need to clean it up here.
connect_string = _get_connect_string("mysql")
engine = sqlalchemy.create_engine(connect_string)
self.engines["mysqlcitest"] = engine
self.test_databases["mysqlcitest"] = connect_string
# build a fully populated mysql database with all the tables
self._reset_databases()
self._walk_versions(engine, False, False)
connection = engine.connect()
# sanity check
total = connection.execute("SELECT count(*) "
"from information_schema.TABLES "
"where TABLE_SCHEMA='openstack_citest'")
self.assertTrue(total.scalar() > 0, "No tables found. Wrong schema?")
noninnodb = connection.execute("SELECT count(*) "
"from information_schema.TABLES "
"where TABLE_SCHEMA='openstack_citest' "
"and ENGINE!='InnoDB' "
"and TABLE_NAME!='migrate_version'")
count = noninnodb.scalar()
self.assertEqual(count, 0, "%d non InnoDB tables created" % count)
connection.close()
def test_postgresql_connect_fail(self):
"""
Test that we can trigger a postgres connection failure and we fail
gracefully to ensure we don't break people without postgres
"""
if _is_backend_avail('postgresql', user="openstack_cifail"):
self.fail("Shouldn't have connected")
def test_postgresql_opportunistically(self):
# Test postgresql database migration walk
if not _is_backend_avail('postgres'):
self.skipTest("postgresql not available")
# add this to the global lists to make reset work with it, it's removed
# automatically in tearDown so no need to clean it up here.
connect_string = _get_connect_string("postgres")
engine = sqlalchemy.create_engine(connect_string)
self.engines["postgresqlcitest"] = engine
self.test_databases["postgresqlcitest"] = connect_string
# build a fully populated postgresql database with all the tables
self._reset_databases()
self._walk_versions(engine, False, False)
def _walk_versions(self, engine=None, snake_walk=False, downgrade=True):
# Determine latest version script from the repo, then
# upgrade from 1 through to the latest, with no data
# in the databases. This just checks that the schema itself
# upgrades successfully.
# Place the database under version control
migration_api.version_control(engine, TestMigrations.REPOSITORY,
migration.INIT_VERSION)
self.assertEqual(migration.INIT_VERSION,
migration_api.db_version(engine,
TestMigrations.REPOSITORY))
migration_api.upgrade(engine, TestMigrations.REPOSITORY,
migration.INIT_VERSION + 1)
LOG.debug('latest version is %s' % TestMigrations.REPOSITORY.latest)
for version in xrange(migration.INIT_VERSION + 2,
TestMigrations.REPOSITORY.latest + 1):
# upgrade -> downgrade -> upgrade
self._migrate_up(engine, version, with_data=True)
if snake_walk:
self._migrate_down(engine, version)
self._migrate_up(engine, version)
if downgrade:
# Now walk it back down to 0 from the latest, testing
# the downgrade paths.
for version in reversed(
xrange(migration.INIT_VERSION + 2,
TestMigrations.REPOSITORY.latest + 1)):
# downgrade -> upgrade -> downgrade
self._migrate_down(engine, version)
if snake_walk:
self._migrate_up(engine, version)
self._migrate_down(engine, version)
def _migrate_down(self, engine, version):
migration_api.downgrade(engine,
TestMigrations.REPOSITORY,
version)
self.assertEqual(version,
migration_api.db_version(engine,
TestMigrations.REPOSITORY))
def _migrate_up(self, engine, version, with_data=False):
"""migrate up to a new version of the db.
We allow for data insertion and post checks at every
migration version with special _prerun_### and
_check_### functions in the main test.
"""
# NOTE(sdague): try block is here because it's impossible to debug
# where a failed data migration happens otherwise
try:
if with_data:
data = None
prerun = getattr(self, "_prerun_%d" % version, None)
if prerun:
data = prerun(engine)
migration_api.upgrade(engine,
TestMigrations.REPOSITORY,
version)
self.assertEqual(
version,
migration_api.db_version(engine,
TestMigrations.REPOSITORY))
if with_data:
check = getattr(self, "_check_%d" % version, None)
if check:
check(engine, data)
except Exception:
LOG.error("Failed to migrate to version %s on engine %s" %
(version, engine))
raise
def _prerun_134(self, engine):
now = timeutils.utcnow()
data = [{
'id': 1,
'uuid': '1d739808-d7ec-4944-b252-f8363e119755',
'mac': '00:00:00:00:00:01',
'start_period': now,
'last_refreshed': now + datetime.timedelta(seconds=10),
'bw_in': 100000,
'bw_out': 200000,
}, {
'id': 2,
'uuid': '1d739808-d7ec-4944-b252-f8363e119756',
'mac': '2a:f2:48:31:c1:60',
'start_period': now,
'last_refreshed': now + datetime.timedelta(seconds=20),
'bw_in': 1000000000,
'bw_out': 200000000,
}, {
'id': 3,
# This is intended to be the same as above.
'uuid': '1d739808-d7ec-4944-b252-f8363e119756',
'mac': '00:00:00:00:00:02',
'start_period': now,
'last_refreshed': now + datetime.timedelta(seconds=30),
'bw_in': 0,
'bw_out': 0,
}]
bw_usage_cache = get_table(engine, 'bw_usage_cache')
engine.execute(bw_usage_cache.insert(), data)
return data
def _check_134(self, engine, data):
bw_usage_cache = get_table(engine, 'bw_usage_cache')
# Checks if both columns have been successfuly created.
self.assertIn('last_ctr_in', bw_usage_cache.c)
self.assertIn('last_ctr_out', bw_usage_cache.c)
# Checks if all rows have been inserted.
bw_items = bw_usage_cache.select().execute().fetchall()
self.assertEqual(len(bw_items), 3)
bw = bw_usage_cache.select(
bw_usage_cache.c.id == 1).execute().first()
# New columns have 'NULL' as default value.
self.assertEqual(bw['last_ctr_in'], None)
self.assertEqual(bw['last_ctr_out'], None)
self.assertEqual(data[0]['mac'], bw['mac'])
# migration 141, update migrations instance uuid
def _prerun_141(self, engine):
data = {
'instance_uuid': str(uuid.uuid4())
}
migrations = get_table(engine, 'migrations')
engine.execute(migrations.insert(), data)
result = migrations.insert().values(data).execute()
data['id'] = result.inserted_primary_key[0]
return data
def _check_141(self, engine, data):
migrations = get_table(engine, 'migrations')
row = migrations.select(
migrations.c.id == data['id']).execute().first()
# Check that change to String(36) went alright
self.assertEqual(data['instance_uuid'], row['instance_uuid'])
# migration 146, availability zone transition
def _prerun_146(self, engine):
data = {
'availability_zone': 'custom_az',
'name': 'name',
}
aggregates = get_table(engine, 'aggregates')
result = aggregates.insert().values(data).execute()
# NOTE(sdague) it's important you don't insert keys by value in
# postgresql, because its autoincrement counter won't get updated
data['id'] = result.inserted_primary_key[0]
return data
def _check_146(self, engine, data):
aggregate_md = get_table(engine, 'aggregate_metadata')
md = aggregate_md.select(
aggregate_md.c.aggregate_id == data['id']).execute().first()
self.assertEqual(data['availability_zone'], md['value'])
# migration 147, availability zone transition for services
def _prerun_147(self, engine):
az = 'test_zone'
host1 = 'compute-host1'
host2 = 'compute-host2'
# start at id == 2 because we already inserted one
data = [
{'id': 1, 'host': host1,
'binary': 'nova-compute', 'topic': 'compute',
'report_count': 0, 'availability_zone': az},
{'id': 2, 'host': 'sched-host',
'binary': 'nova-scheduler', 'topic': 'scheduler',
'report_count': 0, 'availability_zone': 'ignore_me'},
{'id': 3, 'host': host2,
'binary': 'nova-compute', 'topic': 'compute',
'report_count': 0, 'availability_zone': az},
]
services = get_table(engine, 'services')
engine.execute(services.insert(), data)
return data
def _check_147(self, engine, data):
aggregate_md = get_table(engine, 'aggregate_metadata')
aggregate_hosts = get_table(engine, 'aggregate_hosts')
# NOTE(sdague): hard coded to id == 2, because we added to
# aggregate_metadata previously
for item in data:
md = aggregate_md.select(
aggregate_md.c.aggregate_id == 2).execute().first()
if item['binary'] == "nova-compute":
self.assertEqual(item['availability_zone'], md['value'])
host = aggregate_hosts.select(
aggregate_hosts.c.aggregate_id == 2
).execute().first()
self.assertEqual(host['host'], data[0]['host'])
# NOTE(sdague): id 3 is just non-existent
host = aggregate_hosts.select(
aggregate_hosts.c.aggregate_id == 3
).execute().first()
self.assertEqual(host, None)
# migration 149, changes IPAddr storage format
def _prerun_149(self, engine):
provider_fw_rules = get_table(engine, 'provider_fw_rules')
data = [
{'protocol': 'tcp', 'from_port': 1234,
'to_port': 1234, 'cidr': "127.0.0.1"},
{'protocol': 'tcp', 'from_port': 1234,
'to_port': 1234, 'cidr': "255.255.255.255"},
{'protocol': 'tcp', 'from_port': 1234,
'to_port': 1234, 'cidr': "2001:db8::1:2"},
{'protocol': 'tcp', 'from_port': 1234,
'to_port': 1234, 'cidr': "::1"}
]
engine.execute(provider_fw_rules.insert(), data)
return data
def _check_149(self, engine, data):
provider_fw_rules = get_table(engine, 'provider_fw_rules')
result = provider_fw_rules.select().execute()
iplist = map(lambda x: x['cidr'], data)
for row in result:
self.assertIn(row['cidr'], iplist)
# migration 151 - changes period_beginning and period_ending to DateTime
def _prerun_151(self, engine):
task_log = get_table(engine, 'task_log')
data = {
'task_name': 'The name of the task',
'state': 'The state of the task',
'host': 'compute-host1',
'period_beginning': str(datetime.datetime(2013, 02, 11)),
'period_ending': str(datetime.datetime(2013, 02, 12)),
'message': 'The task_log message',
}
result = task_log.insert().values(data).execute()
data['id'] = result.inserted_primary_key[0]
return data
def _check_151(self, engine, data):
task_log = get_table(engine, 'task_log')
row = task_log.select(task_log.c.id == data['id']).execute().first()
self.assertTrue(isinstance(row['period_beginning'],
datetime.datetime))
self.assertTrue(isinstance(row['period_ending'],
datetime.datetime))
self.assertEqual(
data['period_beginning'], str(row['period_beginning']))
self.assertEqual(data['period_ending'], str(row['period_ending']))
# migration 152 - convert deleted from boolean to int
def _prerun_152(self, engine):
host1 = 'compute-host1'
host2 = 'compute-host2'
# NOTE(sdague): start at #4 because services data already in table
# from 147
services_data = [
{'id': 4, 'host': host1, 'binary': 'nova-compute',
'report_count': 0, 'topic': 'compute', 'deleted': False},
{'id': 5, 'host': host1, 'binary': 'nova-compute',
'report_count': 0, 'topic': 'compute', 'deleted': True}
]
volumes_data = [
{'id': 'first', 'host': host1, 'deleted': False},
{'id': 'second', 'host': host2, 'deleted': True}
]
services = get_table(engine, 'services')
engine.execute(services.insert(), services_data)
volumes = get_table(engine, 'volumes')
engine.execute(volumes.insert(), volumes_data)
return dict(services=services_data, volumes=volumes_data)
def _check_152(self, engine, data):
services = get_table(engine, 'services')
service = services.select(services.c.id == 4).execute().first()
self.assertEqual(0, service.deleted)
service = services.select(services.c.id == 5).execute().first()
self.assertEqual(service.id, service.deleted)
volumes = get_table(engine, 'volumes')
volume = volumes.select(volumes.c.id == "first").execute().first()
self.assertEqual("", volume.deleted)
volume = volumes.select(volumes.c.id == "second").execute().first()
self.assertEqual(volume.id, volume.deleted)
# migration 153, copy flavor information into system_metadata
def _prerun_153(self, engine):
fake_types = [
dict(id=10, name='type1', memory_mb=128, vcpus=1,
root_gb=10, ephemeral_gb=0, flavorid="1", swap=0,
rxtx_factor=1.0, vcpu_weight=1, disabled=False,
is_public=True),
dict(id=11, name='type2', memory_mb=512, vcpus=1,
root_gb=10, ephemeral_gb=5, flavorid="2", swap=0,
rxtx_factor=1.5, vcpu_weight=2, disabled=False,
is_public=True),
dict(id=12, name='type3', memory_mb=128, vcpus=1,
root_gb=10, ephemeral_gb=0, flavorid="3", swap=0,
rxtx_factor=1.0, vcpu_weight=1, disabled=False,
is_public=False),
dict(id=13, name='type4', memory_mb=128, vcpus=1,
root_gb=10, ephemeral_gb=0, flavorid="4", swap=0,
rxtx_factor=1.0, vcpu_weight=1, disabled=True,
is_public=True),
dict(id=14, name='type5', memory_mb=128, vcpus=1,
root_gb=10, ephemeral_gb=0, flavorid="5", swap=0,
rxtx_factor=1.0, vcpu_weight=1, disabled=True,
is_public=False),
]
fake_instances = [
dict(uuid='m153-uuid1', instance_type_id=10),
dict(uuid='m153-uuid2', instance_type_id=11),
dict(uuid='m153-uuid3', instance_type_id=12),
dict(uuid='m153-uuid4', instance_type_id=13),
# NOTE(danms): no use of type5
]
instances = get_table(engine, 'instances')
instance_types = get_table(engine, 'instance_types')
engine.execute(instance_types.insert(), fake_types)
engine.execute(instances.insert(), fake_instances)
return fake_types, fake_instances
def _check_153(self, engine, data):
fake_types, fake_instances = data
# NOTE(danms): Fetch all the tables and data from scratch after change
instances = get_table(engine, 'instances')
instance_types = get_table(engine, 'instance_types')
sys_meta = get_table(engine, 'instance_system_metadata')
# Collect all system metadata, indexed by instance_uuid
metadata = collections.defaultdict(dict)
for values in sys_meta.select().execute():
metadata[values['instance_uuid']][values['key']] = values['value']
# Taken from nova/compute/api.py
instance_type_props = ['id', 'name', 'memory_mb', 'vcpus',
'root_gb', 'ephemeral_gb', 'flavorid',
'swap', 'rxtx_factor', 'vcpu_weight']
for instance in fake_instances:
inst_sys_meta = metadata[instance['uuid']]
inst_type = fake_types[instance['instance_type_id'] - 10]
for prop in instance_type_props:
prop_name = 'instance_type_%s' % prop
self.assertIn(prop_name, inst_sys_meta)
self.assertEqual(str(inst_sys_meta[prop_name]),
str(inst_type[prop]))
# migration 154, add shadow tables for deleted data
# There are 53 shadow tables but we only test one
# There are additional tests in test_db_api.py
def _prerun_154(self, engine):
meta = sqlalchemy.schema.MetaData()
meta.reflect(engine)
table_names = meta.tables.keys()
for table_name in table_names:
self.assertFalse(table_name.startswith("_shadow"))
def _check_154(self, engine, data):
meta = sqlalchemy.schema.MetaData()
meta.reflect(engine)
table_names = set(meta.tables.keys())
for table_name in table_names:
print table_name
if table_name.startswith("shadow_"):
shadow_name = table_name
base_name = table_name.replace("shadow_", "")
self.assertIn(base_name, table_names)
else:
base_name = table_name
shadow_name = "shadow_" + table_name
self.assertIn(shadow_name, table_names)
shadow_table = get_table(engine, shadow_name)
base_table = get_table(engine, base_name)
base_columns = []
shadow_columns = []
for column in base_table.columns:
base_columns.append(column)
for column in shadow_table.columns:
shadow_columns.append(column)
for ii, base_column in enumerate(base_columns):
shadow_column = shadow_columns[ii]
self.assertEqual(base_column.name, shadow_column.name)
# NullType needs a special case. We end up with NullType on sqlite
# where bigint is not defined.
if isinstance(base_column.type, sqlalchemy.types.NullType):
self.assertTrue(isinstance(shadow_column.type,
sqlalchemy.types.NullType))
else:
# Identical types do not test equal because sqlalchemy does not
# override __eq__, but if we stringify them then they do.
self.assertEqual(str(base_column.type),
str(shadow_column.type))