def test_uml_associations(self):
from gaphor.UML.event import AssociationUpdated
from gaphor.UML.properties import association, derivedunion
from gaphor.UML import Element
event_manager = EventManager()
undo_manager = UndoManager(event_manager)
element_factory = ElementFactory(event_manager)
class A(Element):
is_unlinked = False
def unlink(self):
self.is_unlinked = True
Element.unlink(self)
A.a1 = association("a1", A, upper=1)
A.a2 = association("a2", A, upper=1)
A.b1 = association("b1", A, upper="*")
A.b2 = association("b2", A, upper="*")
A.b3 = association("b3", A, upper=1)
A.derived_a = derivedunion(A, "derived_a", 0, 1, A.a1, A.a2)
A.derived_b = derivedunion(A, "derived_b", 0, "*", A.b1, A.b2, A.b3)
events = []
@event_handler(AssociationUpdated)
def handler(event, events=events):
events.append(event)
event_manager.subscribe(handler)
try:
a = element_factory.create(A)
undo_manager.begin_transaction()
a.a1 = element_factory.create(A)
undo_manager.commit_transaction()
assert len(events) == 1, events
assert events[0].property is A.a1
assert undo_manager.can_undo()
undo_manager.undo_transaction()
assert not undo_manager.can_undo()
assert undo_manager.can_redo()
assert len(events) == 2, events
assert events[1].property is A.a1
finally:
event_manager.unsubscribe(handler)
undo_manager.shutdown()
class TransactionTestCase(TestCase):
"""Test case for transactions with the component registry
enabled."""
def setUp(self):
"""Initialize Gaphor services and register transaction event
handlers."""
self.event_manager = EventManager()
self.event_manager.subscribe(handle_begins)
self.event_manager.subscribe(handle_commits)
self.event_manager.subscribe(handle_rollback)
del begins[:]
del commits[:]
del rollbacks[:]
def tearDown(self):
"""Finished with the test case. Unregister event handlers that
store transaction events."""
self.event_manager.unsubscribe(handle_begins)
self.event_manager.unsubscribe(handle_commits)
self.event_manager.unsubscribe(handle_rollback)
def test_transaction_commit(self):
"""Test committing a transaction."""
tx = Transaction(self.event_manager)
assert tx._stack, "Transaction has no stack"
assert 1 == len(begins), "Incorrect number of TrasactionBegin events"
assert 0 == len(
commits), "Incorrect number of TransactionCommit events"
assert 0 == len(
rollbacks), "Incorrect number of TransactionRollback events"
tx.commit()
assert 1 == len(begins), "Incorrect number of TrasactionBegin events"
assert 1 == len(
commits), "Incorrect number of TransactionCommit events"
assert 0 == len(
rollbacks), "Incorrect number of TransactionRollback events"
assert not tx._stack, "Transaction stack is not empty"
try:
tx.commit()
except TransactionError:
pass
else:
self.fail("Commit should not have succeeded")
def test_transaction_rollback(self):
"""Test rolling back a transaction."""
tx = Transaction(self.event_manager)
assert tx._stack, "Transaction has no stack"
assert 1 == len(begins), "Incorrect number of TrasactionBegin events"
assert 0 == len(
commits), "Incorrect number of TransactionCommit events"
assert 0 == len(
rollbacks), "Incorrect number of TransactionRollback events"
tx.rollback()
assert 1 == len(begins), "Incorrect number of TrasactionBegin events"
assert 0 == len(
commits), "Incorrect number of TransactionCommit events"
assert 1 == len(
rollbacks), "Incorrect number of TransactionRollback events"
assert not tx._stack, "Transaction stack is not empty"
def test_transaction_commit_after_rollback(self):
"""Test committing one transaction after rolling back another
transaction."""
tx1 = Transaction(self.event_manager)
tx2 = Transaction(self.event_manager)
tx2.rollback()
tx1.commit()
assert 1 == len(begins), "Incorrect number of TrasactionBegin events"
assert 0 == len(
commits), "Incorrect number of TransactionCommit events"
assert 1 == len(
rollbacks), "Incorrect number of TransactionRollback events"
def test_transaction_stack(self):
"""Test the transaction stack."""
tx1 = Transaction(self.event_manager)
tx2 = Transaction(self.event_manager)
try:
self.assertRaises(TransactionError, tx1.commit)
finally:
tx2.rollback()
tx1.rollback()
def test_transaction_context(self):
"""Test the transaction context manager."""
with Transaction(self.event_manager) as tx:
assert isinstance(
tx, Transaction), "Context is not a Transaction instance"
assert (Transaction._stack
), "Transaction instance has no stack inside a context"
assert not Transaction._stack, "Transaction stack should be empty"
def test_transaction_context_error(self):
"""Test the transaction context manager with errors."""
try:
with Transaction(self.event_manager):
raise TypeError("transaction error")
except TypeError as e:
assert "transaction error" == str(
e
), "Transaction context manager did no raise correct exception"
else:
self.fail(
"Transaction context manager did not raise exception when it should have"
)
