OpenStack Common DB Code
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oslo.db/tests/sqlalchemy/test_migrate.py

97 lines
3.6 KiB

# Copyright (c) 2013 OpenStack Foundation
# 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.
from migrate.changeset.constraint import UniqueConstraint
from migrate.changeset.databases import sqlite
import sqlalchemy as sa
from oslo.db.sqlalchemy import migration
from oslo.db.sqlalchemy import test_base
def uniques(*constraints):
"""Make a sequence of UniqueConstraint instances easily comparable
Convert a sequence of UniqueConstraint instances into a set of
tuples of form (constraint_name, (constraint_columns)) so that
assertEqual() will be able to compare sets of unique constraints
"""
return set((uc.name, tuple(uc.columns.keys())) for uc in constraints)
class TestSqliteUniqueConstraints(test_base.DbTestCase):
def setUp(self):
super(TestSqliteUniqueConstraints, self).setUp()
migration.patch_migrate()
self.helper = sqlite.SQLiteHelper()
test_table = sa.Table(
'test_table',
sa.schema.MetaData(bind=self.engine),
sa.Column('a', sa.Integer),
sa.Column('b', sa.String(10)),
sa.Column('c', sa.Integer),
sa.UniqueConstraint('a', 'b', name='unique_a_b'),
sa.UniqueConstraint('b', 'c', name='unique_b_c')
)
test_table.create()
self.addCleanup(test_table.drop)
# NOTE(rpodolyaka): it's important to use the reflected table here
# rather than original one because this is what
# we actually do in db migrations code
self.reflected_table = sa.Table(
'test_table',
sa.schema.MetaData(bind=self.engine),
autoload=True
)
@test_base.backend_specific('sqlite')
def test_get_unique_constraints(self):
table = self.reflected_table
existing = uniques(*self.helper._get_unique_constraints(table))
should_be = uniques(
sa.UniqueConstraint(table.c.a, table.c.b, name='unique_a_b'),
sa.UniqueConstraint(table.c.b, table.c.c, name='unique_b_c'),
)
self.assertEqual(should_be, existing)
@test_base.backend_specific('sqlite')
def test_add_unique_constraint(self):
table = self.reflected_table
UniqueConstraint(table.c.a, table.c.c, name='unique_a_c').create()
existing = uniques(*self.helper._get_unique_constraints(table))
should_be = uniques(
sa.UniqueConstraint(table.c.a, table.c.b, name='unique_a_b'),
sa.UniqueConstraint(table.c.b, table.c.c, name='unique_b_c'),
sa.UniqueConstraint(table.c.a, table.c.c, name='unique_a_c'),
)
self.assertEqual(should_be, existing)
@test_base.backend_specific('sqlite')
def test_drop_unique_constraint(self):
table = self.reflected_table
UniqueConstraint(table.c.a, table.c.b, name='unique_a_b').drop()
existing = uniques(*self.helper._get_unique_constraints(table))
should_be = uniques(
sa.UniqueConstraint(table.c.b, table.c.c, name='unique_b_c'),
)
self.assertEqual(should_be, existing)