def test_opened_database_commits_on_exit(self):
config_file = os.path.join(self.make_dir(), "config")
config_key = factory.make_name("key")
config_value = factory.make_name("value")
with ConfigurationDatabase.open_for_update(config_file) as config:
config[config_key] = config_value
with ConfigurationDatabase.open(config_file) as config:
self.assertEqual(config_value, config[config_key])
def test_open_and_close(self):
# ConfigurationDatabase.open() returns a context manager that closes
# the database on exit.
config_file = os.path.join(self.make_dir(), "config")
config = ConfigurationDatabase.open_for_update(config_file)
self.assertIsInstance(config, contextlib._GeneratorContextManager)
with config as config:
self.assertIsInstance(config, ConfigurationDatabase)
with config.cursor() as cursor:
self.assertEqual((1, ), cursor.execute("SELECT 1").fetchone())
self.assertRaises(sqlite3.ProgrammingError, config.cursor)
def test_opened_database_rolls_back_on_unclean_exit(self):
config_file = os.path.join(self.make_dir(), "config")
config_key = factory.make_name("key")
config_value = factory.make_name("value")
exception_type = factory.make_exception_type()
# Set a configuration option, then crash.
with ExpectedException(exception_type):
with ConfigurationDatabase.open_for_update(config_file) as config:
config[config_key] = config_value
raise exception_type()
# No value has been saved for `config_key`.
with ConfigurationDatabase.open(config_file) as config:
self.assertRaises(KeyError, lambda: config[config_key])
def test_open_for_update_yields_mutable_backend(self):
config_file = os.path.join(self.make_dir(), "config")
config_key = factory.make_name("key")
with ConfigurationDatabase.open_for_update(config_file) as config:
config[config_key] = factory.make_name("value")
del config[config_key]