def test_unique_context():
"""
Ensure that we get a new context on each DAL enter.
"""
data_manager = DataManager()
with data_manager.dal():
context1 = data_manager.get_active_context()
with data_manager.dal():
context2 = data_manager.get_active_context()
assert context1 != context2
def test_unique_context():
"""
Ensure that we get a new context on each DAL enter.
"""
data_manager = DataManager()
with data_manager.dal():
context1 = data_manager.get_active_context()
with data_manager.dal():
context2 = data_manager.get_active_context()
assert context1 != context2
def test_middleware():
"""
Verify that Middleware can access Resources and that
the Middleware is setup and torndown.
"""
class TestMiddleware(object):
"""
Example middleware that sets it's state at
setup and teardown.
"""
def __call__(self, context):
context.store['state'] = 'setup'
yield
context.store['state'] = 'torndown'
data_store = {}
data_manager = DataManager()
data_manager.register_services(test=StateTestService())
# Middleware that starts and ends with the context
data_manager.register_context_middleware(TestMiddleware(), )
data_manager.register_resources(store=ValueResource(data_store))
with data_manager.dal() as dal:
assert dal.test.get_state() == 'setup'
dal.test.change_state('middle')
assert dal.test.get_state() == 'middle'
assert data_store['state'] == 'torndown'
def test_middleware():
"""
Verify that Middleware can access Resources and that
the Middleware is setup and torndown.
"""
class TestMiddleware(object):
"""
Example middleware that sets it's state at
setup and teardown.
"""
def __call__(self, context):
context.store['state'] = 'setup'
yield
context.store['state'] = 'torndown'
data_store = {}
data_manager = DataManager()
data_manager.register_services(test=TestService())
# Middleware that starts and ends with the context
data_manager.register_context_middleware(
TestMiddleware(),
)
data_manager.register_resources(
store=ValueResource(data_store)
)
with data_manager.dal() as dal:
assert dal.test.get_state() == 'setup'
dal.test.change_state('middle')
assert dal.test.get_state() == 'middle'
assert data_store['state'] == 'torndown'
def test_replace_unique_service():
"""
Verify you can replace an existing service
"""
data_manager = DataManager()
data_manager.register_services(test=Service())
new_service = Service()
data_manager.replace_service('test', new_service)
with data_manager.dal() as dal:
assert dal.test is new_service
def test_replace_unique_service():
"""
Verify you can replace an existing service
"""
data_manager = DataManager()
data_manager.register_services(test=Service())
new_service = Service()
data_manager.replace_service('test', new_service)
with data_manager.dal() as dal:
assert dal.test is new_service
def test_middleware_that_yields_too_much():
"""
Verify that middleware that yields more
than once raises a RuntimeError
"""
def chatty_middleware(context):
"""
Middleware should only yield once
"""
yield
yield
data_manager = DataManager()
data_manager.register_context_middleware(chatty_middleware)
with pytest.raises(RuntimeError):
with data_manager.dal():
pass
def test_middleware_that_yields_too_much():
"""
Verify that middleware that yields more
than once raises a RuntimeError
"""
def chatty_middleware(context):
"""
Middleware should only yield once
"""
yield
yield
data_manager = DataManager()
data_manager.register_context_middleware(chatty_middleware)
with pytest.raises(RuntimeError):
with data_manager.dal():
pass
def test_service_context():
"""
Verify that if you access a Service's context when no
context is active, you get a RuntimeError.
"""
class TestService(Service):
def get_context(self):
return self._ctx
data_manager = DataManager()
data_manager.register_services(test=TestService())
with data_manager.dal() as dal:
ctx = dal.test.get_context()
get_context = dal.test.get_context
assert isinstance(ctx, DataAccessContext)
with pytest.raises(RuntimeError):
get_context()
def test_middleware_that_has_setup_error():
"""
Verify that middleware that raises an exception on setup
prevents dal context from starting
"""
class SetupError(Exception):
pass
def error_middleware(context):
if True:
raise SetupError()
yield
data_manager = DataManager()
data_manager.register_services(test=StateTestService())
data_manager.register_context_middleware(error_middleware)
with pytest.raises(SetupError):
with data_manager.dal():
pytest.fail('Context should not have continued')
def test_middleware_that_has_setup_error():
"""
Verify that middleware that raises an exception on setup
prevents dal context from starting
"""
class SetupError(Exception):
pass
def error_middleware(context):
if True:
raise SetupError()
yield
data_manager = DataManager()
data_manager.register_services(test=TestService())
data_manager.register_context_middleware(error_middleware)
with pytest.raises(SetupError):
with data_manager.dal():
pytest.fail('Context should not have continued')
def test_middleware_that_does_not_yield():
"""
Verify that middleware that does not yield raises a
MiddlewareSetupException and prevents dal context from starting.
"""
def bogus_middleware(context):
"""
This is a valid generator function because of the ``yield``
but the ``yield`` will never occur so this is invalid middleware.
Middleware must ``yield`` once to be valid.
"""
if False:
yield
data_manager = DataManager()
data_manager.register_services(test=StateTestService())
data_manager.register_context_middleware(bogus_middleware)
with pytest.raises(MiddlewareSetupException):
with data_manager.dal():
pytest.fail('Context should not have continued')
def test_middleware_that_does_not_yield():
"""
Verify that middleware that does not yield raises a
MiddlewareSetupException and prevents dal context from starting.
"""
def bogus_middleware(context):
"""
This is a valid generator function because of the ``yield``
but the ``yield`` will never occur so this is invalid middleware.
Middleware must ``yield`` once to be valid.
"""
if False:
yield
data_manager = DataManager()
data_manager.register_services(test=TestService())
data_manager.register_context_middleware(bogus_middleware)
with pytest.raises(MiddlewareSetupException):
with data_manager.dal():
pytest.fail('Context should not have continued')
def test_service_context():
"""
Verify that if you access a Service's context when no
context is active, you get a RuntimeError.
"""
class TestService(Service):
def get_context(self):
return self._ctx
data_manager = DataManager()
data_manager.register_services(test=TestService())
with data_manager.dal() as dal:
ctx = dal.test.get_context()
get_context = dal.test.get_context
assert isinstance(ctx, DataAccessContext)
with pytest.raises(RuntimeError):
get_context()