Animate ship crafter deliveries

tests/test_vessel_delivery.gd

@@ -0,0 +1,52 @@
+extends SceneTree
+
+# Forgejo #28: a completed crafter order visibly travels to the mothership,
+# rather than appearing in the hangar at the instant the build timer ends.
+var game_state: Node
+var scene: Node
+var stage := 0
+var elapsed := 0.0
+
+
+func _initialize() -> void:
+	game_state = root.get_node("GameState")
+	game_state.buildings.clear()
+	game_state.extractors.clear()
+	game_state.transporters.clear()
+	game_state.vessel_deliveries.clear()
+	game_state.stored_vessels.clear()
+	game_state.build_time_scale = 0.02
+	game_state.add_building(GameState.BUILDING_MOTHERSHIP, Vector2.ZERO)
+	game_state.add_building(GameState.BUILDING_SHIP_CRAFTER, Vector2(900, 0))
+	game_state.deposit_to_building(2, GameState.SHIP_COST)
+	game_state.queue_order(2, GameState.PRODUCT_SHIP)
+	scene = load("res://Main.tscn").instantiate()
+	root.add_child(scene)
+
+
+func _process(delta: float) -> bool:
+	elapsed += delta
+	if stage == 0 and not game_state.vessel_deliveries.is_empty():
+		if not game_state.stored_vessels.is_empty():
+			return _fail("ship reached hangar before its delivery flight")
+		var field: Node = scene.get_node("VesselDeliveryField")
+		if field.active.is_empty():
+			return _fail("delivery flight was not rendered")
+		print("finished ship launched from crafter toward mothership")
+		stage = 1
+	if stage == 1 and game_state.vessel_deliveries.is_empty():
+		if game_state.stored_vessels.size() != 1:
+			return _fail("delivered ship did not arrive in hangar")
+		print("delivery arrived in mothership hangar")
+		print("TEST_VESSEL_DELIVERY: PASS")
+		quit(0)
+		return true
+	if elapsed > 8.0:
+		return _fail("delivery timed out")
+	return false
+
+
+func _fail(message: String) -> bool:
+	print("TEST_VESSEL_DELIVERY: FAIL (%s)" % message)
+	quit(1)
+	return true