async def test_eventstream_should_raise_version_error_when_dependency_not_found():
# arrange
owner_changed = OwnerChanged(new_owner="Jane Doe")
# act and assert
with pytest.raises(DependencyDoesNotExist) as e:
event_stream = EventStream()
event_stream.add(owner_changed)
async def test_eventstream_should_append_new_event():
# arrange
bank_account_created = BankAccountCreated(
id="052c21b6-aab9-4311-b954-518cd04f704c", owner="John Doe"
)
# act
event_stream = EventStream()
event_stream.add(bank_account_created)
# assert
assert len(event_stream) == 1
assert event_stream.current_version == 0
assert list(event_stream)[0] == bank_account_created
async def test_save_should_create_event_store(dbsession, eventsourcing):
# arrange
aggregate_id = '052c21b6-aab9-4311-b954-518cd04f704c'
events = EventStream(
[BankAccountCreated(id=aggregate_id, owner='John Doe')])
# act
async with eventsourcing.open('event_store') as eventstore:
await eventstore.append_to_stream(aggregate_id, events)
result = await eventstore.get_stream(aggregate_id)
# assert
async with dbsession.cursor() as cursor:
stmt = """
SELECT event_store.id, event_store.data, event_store.created_at
FROM event_store WHERE event_store.id = %(id)s
"""
result = await cursor.execute(stmt, {'id': aggregate_id})
event_store = await cursor.fetchone()
assert event_store is not None
assert cursor.rowcount == 1
# id
assert event_store[0] == aggregate_id
assert event_store[1][0]['$type'] == 'BankAccountCreated'
assert event_store[1][0]['$version'] == 0
assert event_store[1][0]['id'] == aggregate_id
assert event_store[1][0]['owner'] == 'John Doe'
assert event_store[2] is not None
async def test_eventstore_should_raise_version_error(dbsession, eventsourcing):
# arrange
aggregate_id = "f2283f9d-9ed2-4385-a614-53805725cbac"
events_base = EventStream(
[BankAccountCreated(id=aggregate_id, owner="John Doe")])
events = EventStream([DepositPerformed(amount=20)])
async with eventsourcing.open("event_store") as eventstore:
await eventstore.append_to_stream(aggregate_id, events_base)
# act
async with dbsession.cursor() as cursor:
stmt = """
UPDATE event_store SET version=%(version)s
WHERE id = %(id)s;
"""
await cursor.execute(stmt, {"id": aggregate_id, "version": 10})
# assert
with pytest.raises(VersionError):
async with eventsourcing.open("event_store") as eventstore:
await eventstore.append_to_stream(aggregate_id, events)
async def test_eventstream_should_raise_stream_exists_when_stream_exists():
# arrange
bank_account_created_1 = BankAccountCreated(
id="052c21b6-aab9-4311-b954-518cd04f704c", owner="John Doe"
)
bank_account_created_2 = BankAccountCreated(
id="052c21b6-aab9-4311-b954-518cd04f704c", owner="John Doe"
)
# act
event_stream = EventStream()
event_stream.add(bank_account_created_1)
# assert
with pytest.raises(StreamExists):
event_stream.add(bank_account_created_2)