def test_validate_cycles():
f = Flow(name="test")
t1 = Task()
t2 = Task()
f.add_edge(t1, t2)
f.add_edge(t2, t1)
with pytest.raises(ValueError) as exc:
f.validate()
assert "cycle found" in str(exc.value).lower()
def test_validate_missing_edge_upstream_tasks():
f = Flow(name="test")
t1 = Task()
t2 = Task()
f.add_edge(t1, t2)
f.tasks.remove(t1)
with pytest.raises(ValueError) as exc:
f.validate()
assert "edges refer to tasks" in str(exc.value).lower()
def test_validate_missing_reference_tasks():
f = Flow(name="test")
t1 = Task()
t2 = Task()
f.add_task(t1)
f.add_task(t2)
f.set_reference_tasks([t1])
f.tasks.remove(t1)
with pytest.raises(ValueError) as exc:
f.validate()
assert "reference tasks are not contained" in str(exc.value).lower()
def test_eager_cycle_detection_defaults_false():
assert not prefect.config.flows.eager_edge_validation
f = Flow(name="test")
t1 = Task()
t2 = Task()
f.add_edge(t1, t2)
# no cycle detected
assert f.add_edge(t2, t1)
with pytest.raises(ValueError):
f.validate()