Pathfinder MCP Server

"""Tests for state machine.""" import pytest from pathfinder_mcp.state import Phase, PhaseState class TestPhase: """Tests for Phase enum.""" def test_phase_values(self) -> None: """Phase enum has correct values.""" assert Phase.RESEARCH.value == "research" assert Phase.PLAN.value == "plan" assert Phase.IMPLEMENT.value == "implement" def test_phase_is_string_enum(self) -> None: """Phase enum values are strings.""" assert isinstance(Phase.RESEARCH.value, str) class TestPhaseState: """Tests for PhaseState class.""" def test_initial_state_is_research(self) -> None: """New PhaseState defaults to RESEARCH.""" state = PhaseState(session_id="test") assert state.current_phase == Phase.RESEARCH assert state.is_research def test_can_transition_research_to_plan(self, research_state: PhaseState) -> None: """Can transition from RESEARCH to PLAN.""" assert research_state.can_transition_to(Phase.PLAN) def test_cannot_transition_research_to_implement( self, research_state: PhaseState ) -> None: """Cannot skip PLAN phase.""" assert not research_state.can_transition_to(Phase.IMPLEMENT) def test_can_transition_plan_to_implement(self, plan_state: PhaseState) -> None: """Can transition from PLAN to IMPLEMENT.""" assert plan_state.can_transition_to(Phase.IMPLEMENT) def test_cannot_transition_backwards(self, plan_state: PhaseState) -> None: """Cannot transition backwards.""" assert not plan_state.can_transition_to(Phase.RESEARCH) def test_implement_is_terminal(self, implement_state: PhaseState) -> None: """IMPLEMENT phase has no valid transitions.""" assert not implement_state.can_transition_to(Phase.RESEARCH) assert not implement_state.can_transition_to(Phase.PLAN) def test_transition_to_valid_phase(self, research_state: PhaseState) -> None: """transition_to returns new state with updated phase.""" new_state = research_state.transition_to(Phase.PLAN) assert new_state.current_phase == Phase.PLAN assert new_state.is_plan # Original unchanged assert research_state.current_phase == Phase.RESEARCH def test_transition_to_invalid_raises(self, research_state: PhaseState) -> None: """transition_to raises ValueError for invalid transition.""" with pytest.raises(ValueError, match="Invalid transition"): research_state.transition_to(Phase.IMPLEMENT) def test_phase_properties(self) -> None: """Phase property methods work correctly.""" research = PhaseState(session_id="t", current_phase=Phase.RESEARCH) plan = PhaseState(session_id="t", current_phase=Phase.PLAN) impl = PhaseState(session_id="t", current_phase=Phase.IMPLEMENT) assert ( research.is_research and not research.is_plan and not research.is_implement ) assert plan.is_plan and not plan.is_research and not plan.is_implement assert impl.is_implement and not impl.is_research and not impl.is_plan