Add one HP per second regeneration and Half-Life starfield sky

tools/test_health_sky.gd

@@ -0,0 +1,54 @@
+extends SceneTree
+
+func _initialize() -> void:
+	call_deferred("run_test")
+
+func run_test() -> void:
+	var world = load("res://scenes/main.tscn").instantiate()
+	root.add_child(world)
+	world.set_process(false)
+	var player = world.player
+	player.set_physics_process(false)
+	player.hp = 90.0
+	player._regenerate_health(0.5)
+	assert(player.hp == 90.0)
+	player._regenerate_health(0.5)
+	assert(player.hp == 91.0)
+	player._regenerate_health(3.0)
+	assert(player.hp == 94.0)
+	print("PASS: +1 HP ogni secondo, recupero frame lunghi")
+	player.hp = 99.5
+	player._regenerate_health(5.0)
+	assert(player.hp == 100.0)
+	player._regenerate_health(0.0)
+	player.hp = 90.0
+	player._regenerate_health(0.5)
+	assert(player.hp == 90.0)
+	print("PASS: limite 100 HP, nessun accumulo a vita piena")
+	if "--screenshot" in OS.get_cmdline_user_args():
+		player.position = Vector3(0, 0, -6)
+		player.camera.rotation = Vector3.ZERO
+		await create_timer(0.5).timeout
+		await RenderingServer.frame_post_draw
+		root.get_texture().get_image().save_png("/tmp/zombie-star-window.png")
+	player.hp = 0
+	player._regenerate_health(10.0)
+	assert(player.hp == 0)
+	player.hp = 30
+	player.death_started = true
+	player._regenerate_health(10.0)
+	assert(player.hp == 30)
+	print("PASS: nessuna rigenerazione dopo morte")
+	var environment: Environment
+	for node in world.get_children():
+		if node is WorldEnvironment:
+			environment = node.environment
+	assert(environment.background_mode == Environment.BG_SKY)
+	assert(environment.sky.sky_material is PanoramaSkyMaterial)
+	var texture = environment.sky.sky_material.panorama
+	assert(texture.get_width() == 2048 and texture.get_height() == 1024)
+	assert(environment.ambient_light_source == Environment.AMBIENT_SOURCE_COLOR)
+	print("PASS: panorama stellato caricato, illuminazione stanza preservata")
+	world.queue_free()
+	await process_frame
+	quit()