def test_non_nullable_fields_cannot_be_saved_with_null_values():
instance = Example(pk=1)
instance.defaulted_field = None
session = Session({})
session.add(instance)
with pytest.raises(ValueError):
session.flush()
def test_add_with_field():
data = {}
session = Session(data)
ex1 = Example(pk=1, name="Paul")
session.add(ex1)
session.flush()
assert data == {"examples/1": {"name": "Paul"}}
def test_add():
data = {}
session = Session(data)
ex1 = Example(pk=1)
session.add(ex1)
session.flush()
assert data == {"examples/1": {}}
def test_error_when_adding_instance_to_two_sessions():
session1, session2 = Session({}), Session({})
ex1 = Example(pk=1, name="Horse")
session1.add(ex1)
with pytest.raises(RuntimeError):
session2.add(ex1)
def test_sessions_are_not_global():
instance_session1 = Example(pk=1)
session = Session({})
session.add(instance_session1)
session.flush()
session2 = Session({})
with pytest.raises(KeyError):
instance_session2 = session2.get(Example, 1)
def test_add_then_remove_entity_has_no_effect():
data = {}
session = Session(data)
ex1 = Example(pk=1, name="Horse")
session.add(ex1)
session.remove(ex1)
session.flush()
assert data == {}
def test_error_when_instantiating_with_duplicate_id():
session = Session({})
session.add(Example(pk=1))
with pytest.raises(RuntimeError):
session.add(Example(pk=1))