django/tests/migrations/test_executor.py

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from django.test import TransactionTestCase
from django.test.utils import override_settings
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from django.db import connection
from django.db.migrations.executor import MigrationExecutor
class ExecutorTests(TransactionTestCase):
"""
Tests the migration executor (full end-to-end running).
Bear in mind that if these are failing you should fix the other
test failures first, as they may be propagating into here.
"""
available_apps = ["migrations", "django.contrib.sessions"]
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
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def test_run(self):
"""
Tests running a simple set of migrations.
"""
executor = MigrationExecutor(connection)
executor.recorder.flush()
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# Let's look at the plan first and make sure it's up to scratch
plan = executor.migration_plan([("migrations", "0002_second")])
self.assertEqual(
plan,
[
(executor.loader.graph.nodes["migrations", "0001_initial"], False),
(executor.loader.graph.nodes["migrations", "0002_second"], False),
],
)
# Were the tables there before?
self.assertNotIn("migrations_author", connection.introspection.get_table_list(connection.cursor()))
self.assertNotIn("migrations_book", connection.introspection.get_table_list(connection.cursor()))
# Alright, let's try running it
executor.migrate([("migrations", "0002_second")])
# Are the tables there now?
self.assertIn("migrations_author", connection.introspection.get_table_list(connection.cursor()))
self.assertIn("migrations_book", connection.introspection.get_table_list(connection.cursor()))
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# Alright, let's undo what we did
executor.migrate([("migrations", None)])
# Are the tables gone?
self.assertNotIn("migrations_author", connection.introspection.get_table_list(connection.cursor()))
self.assertNotIn("migrations_book", connection.introspection.get_table_list(connection.cursor()))
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations", "sessions": "migrations.test_migrations_2"})
def test_empty_plan(self):
"""
Tests that re-planning a full migration of a fully-migrated set doesn't
perform spurious unmigrations and remigrations.
There was previously a bug where the executor just always performed the
backwards plan for applied migrations - which even for the most recent
migration in an app, might include other, dependent apps, and these
were being unmigrated.
"""
# Make the initial plan, check it
# We use 'sessions' here as the second app as it's always present
# in INSTALLED_APPS, so we can happily assign it test migrations.
executor = MigrationExecutor(connection)
plan = executor.migration_plan([("migrations", "0002_second"), ("sessions", "0001_initial")])
self.assertEqual(
plan,
[
(executor.loader.graph.nodes["migrations", "0001_initial"], False),
(executor.loader.graph.nodes["migrations", "0002_second"], False),
(executor.loader.graph.nodes["sessions", "0001_initial"], False),
],
)
# Fake-apply all migrations
executor.migrate([("migrations", "0002_second"), ("sessions", "0001_initial")], fake=True)
# Now plan a second time and make sure it's empty
plan = executor.migration_plan([("migrations", "0002_second"), ("sessions", "0001_initial")])
self.assertEqual(plan, [])
# Erase all the fake records
executor.recorder.flush()