Add lifecycle helper regression tests

tests/test_lifecycle.py

@@ -0,0 +1,68 @@
+from __future__ import annotations
+
+import pytest
+
+from api.services.lifecycle import (
+    has_active_task_status,
+    should_activate_parent_for_active_tasks,
+    should_activate_parent_for_task_start,
+    status_value,
+)
+
+
+@pytest.mark.parametrize("parent_status", ["proposed", "ready", "backlog"])
+def test_task_start_activates_planning_parent(parent_status):
+    assert should_activate_parent_for_task_start(
+        previous_task_status="todo",
+        new_task_status="in_progress",
+        parent_workstream_status=parent_status,
+    )
+
+
+@pytest.mark.parametrize("parent_status", ["active", "blocked", "finished", "archived"])
+def test_task_start_does_not_rewrite_non_planning_parent(parent_status):
+    assert not should_activate_parent_for_task_start(
+        previous_task_status="todo",
+        new_task_status="in_progress",
+        parent_workstream_status=parent_status,
+    )
+
+
+def test_task_start_requires_todo_to_in_progress_transition():
+    assert not should_activate_parent_for_task_start(
+        previous_task_status="in_progress",
+        new_task_status="in_progress",
+        parent_workstream_status="ready",
+    )
+    assert not should_activate_parent_for_task_start(
+        previous_task_status="todo",
+        new_task_status="done",
+        parent_workstream_status="ready",
+    )
+
+
+def test_has_active_task_status_ignores_terminal_and_todo_statuses():
+    assert has_active_task_status(["todo", "done", "cancelled"]) is False
+    assert has_active_task_status(["todo", "blocked"]) is True
+    assert has_active_task_status(["in_progress"]) is True
+
+
+def test_active_task_state_activates_planning_parent_for_renormalization():
+    assert should_activate_parent_for_active_tasks(
+        parent_workstream_status="proposed",
+        task_statuses=["todo", "in_progress"],
+    )
+
+
+def test_active_task_state_does_not_unblock_blocked_parent():
+    assert not should_activate_parent_for_active_tasks(
+        parent_workstream_status="blocked",
+        task_statuses=["in_progress"],
+    )
+
+
+def test_status_value_unwraps_enum_like_values():
+    class Status:
+        value = "In_Progress"
+
+    assert status_value(Status()) == "in_progress"