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import pytest
from stator.graph import State, StateGraph
def test_declare():
"""
Tests a basic graph declaration and various kinds of handler
lookups.
"""
fake_handler = lambda: True
class TestGraph(StateGraph):
initial = State()
second = State()
third = State()
fourth = State()
final = State()
initial.add_transition(second, 60, handler=fake_handler)
second.add_transition(third, 60, handler="check_third")
def check_third(cls):
return True
@third.add_transition(fourth, 60)
def check_fourth(cls):
return True
fourth.add_manual_transition(final)
assert TestGraph.initial_state == TestGraph.initial
assert TestGraph.terminal_states == {TestGraph.final}
assert TestGraph.initial.children[TestGraph.second].get_handler() == fake_handler
assert (
TestGraph.second.children[TestGraph.third].get_handler()
== TestGraph.check_third
)
assert (
TestGraph.third.children[TestGraph.fourth].get_handler().__name__
== "check_fourth"
)
def test_bad_declarations():
"""
Tests that you can't declare an invalid graph.
"""
# More than one initial state
with pytest.raises(ValueError):
class TestGraph(StateGraph):
initial = State()
initial2 = State()
# No initial states
with pytest.raises(ValueError):
class TestGraph(StateGraph):
loop = State()
loop2 = State()
loop.add_transition(loop2, 1, handler="fake")
loop2.add_transition(loop, 1, handler="fake")
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