test(game-state): add unit tests for character positions, object states, and save round-trip

test/unit/test_game_state.gd

@@ -0,0 +1,79 @@
+## Tests for GameState — character positions, object states, save/load round-trip.
+extends GutTest
+
+const GameStateScript: GDScript = preload("res://scripts/autoload/GameState.gd")
+
+var _state: Node
+
+
+func before_each() -> void:
+	_state = GameStateScript.new()
+	add_child_autofree(_state)
+
+
+func test_get_character_position_default_is_zero() -> void:
+	assert_eq(_state.get_character_position("bunny_01"), Vector2.ZERO)
+
+
+func test_has_character_position_returns_false_for_unknown_id() -> void:
+	assert_false(_state.has_character_position("bunny_01"))
+
+
+func test_set_character_position_stores_value() -> void:
+	_state.set_character_position("bunny_01", Vector2(100.0, 200.0))
+	assert_eq(_state.get_character_position("bunny_01"), Vector2(100.0, 200.0))
+
+
+func test_has_character_position_returns_true_after_set() -> void:
+	_state.set_character_position("bunny_01", Vector2(50.0, 50.0))
+	assert_true(_state.has_character_position("bunny_01"))
+
+
+func test_set_character_position_emits_character_moved() -> void:
+	watch_signals(_state)
+	_state.set_character_position("bunny_01", Vector2(100.0, 200.0))
+	assert_signal_emitted(_state, "character_moved")
+
+
+func test_set_character_position_emits_state_changed() -> void:
+	watch_signals(_state)
+	_state.set_character_position("bunny_01", Vector2(100.0, 200.0))
+	assert_signal_emitted(_state, "state_changed")
+
+
+func test_get_object_state_default_is_idle() -> void:
+	assert_eq(_state.get_object_state("gift_box_1"), "idle")
+
+
+func test_set_object_state_stores_value() -> void:
+	_state.set_object_state("gift_box_1", "open")
+	assert_eq(_state.get_object_state("gift_box_1"), "open")
+
+
+func test_set_object_state_emits_state_changed() -> void:
+	watch_signals(_state)
+	_state.set_object_state("gift_box_1", "open")
+	assert_signal_emitted(_state, "state_changed")
+
+
+func test_save_data_round_trip_character_position() -> void:
+	_state.set_character_position("bunny_01", Vector2(100.0, 200.0))
+	var data: Dictionary = _state.get_save_data()
+	_state.set_character_position("bunny_01", Vector2.ZERO)
+	_state.apply_save_data(data)
+	assert_eq(_state.get_character_position("bunny_01"), Vector2(100.0, 200.0))
+
+
+func test_save_data_round_trip_object_state() -> void:
+	_state.set_object_state("gift_box_1", "open")
+	var data: Dictionary = _state.get_save_data()
+	var state2: Node = GameStateScript.new()
+	add_child_autofree(state2)
+	state2.apply_save_data(data)
+	assert_eq(state2.get_object_state("gift_box_1"), "open")
+
+
+func test_apply_save_data_with_empty_dict_does_not_crash() -> void:
+	_state.set_character_position("bunny_01", Vector2(10.0, 20.0))
+	_state.apply_save_data({})
+	assert_eq(_state.get_character_position("bunny_01"), Vector2(10.0, 20.0))