tests & can charge up thrust

tests/screenshot_test.gd

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+extends SceneTree
+## Headless screenshot test — captures a viewport frame after the scene loads.
+## Run:  godot --headless --script tests/screenshot_test.gd
+##
+## Outputs:  tests/output/screenshot.png
+## Exit code 0 = success, 1 = failure.
+
+const OUTPUT_DIR := "res://tests/output"
+const SETTLE_TIME := 2.0  # seconds to let physics/animations settle
+
+
+func _init() -> void:
+	_run.call_deferred()
+
+
+func _run() -> void:
+	# Ensure output directory exists
+	DirAccess.make_dir_recursive_absolute(OUTPUT_DIR)
+
+	# Load and switch to the main scene
+	var scene_res := load("res://scene.tscn")
+	if scene_res == null:
+		push_error("screenshot_test: Failed to load scene.tscn")
+		quit(1)
+		return
+
+	var scene_instance: Node = scene_res.instantiate()
+	root.add_child(scene_instance)
+
+	# Wait for the scene to settle (physics, spawning, animations)
+	await create_timer(SETTLE_TIME).timeout
+
+	# Capture viewport
+	var img: Image = root.get_viewport().get_texture().get_image()
+	if img == null:
+		push_error("screenshot_test: Failed to capture viewport image")
+		quit(1)
+		return
+
+	var path := OUTPUT_DIR + "/screenshot.png"
+	var err := img.save_png(path)
+	if err != OK:
+		push_error("screenshot_test: Failed to save PNG (error %d)" % err)
+		quit(1)
+		return
+
+	print("screenshot_test: Saved %s (%dx%d)" % [path, img.get_width(), img.get_height()])
+	quit(0)