Godot test scene addon

addons/godot_test_scene/test_scene_button.gd

@@ -0,0 +1,40 @@
+@tool
+extends Button
+
+const META_NAME := "test_scene"
+
+func _on_pressed() -> void:
+	var current_scene := EditorInterface.get_edited_scene_root()
+	if current_scene.has_meta(META_NAME):
+		run_test_scene()
+	else:
+		show_selection_window("Select test scene path")
+
+func _on_gui_input(event: InputEvent) -> void:
+	if event is InputEventMouseButton\
+			and event.pressed\
+			and event.button_index == MOUSE_BUTTON_RIGHT:
+		show_selection_window("Select test scene path")
+
+func run_test_scene():
+	var current_scene := EditorInterface.get_edited_scene_root()
+	var test_scene_path := current_scene.get_meta(META_NAME)
+	if ResourceLoader.exists(test_scene_path):
+		EditorInterface.play_custom_scene(test_scene_path)
+	else:
+		current_scene.remove_meta(META_NAME)
+		show_selection_window("No scene exists at saved path, select new path")
+
+func show_selection_window(message:String):
+	var file_dialog := FileDialog.new()
+	file_dialog.mode_overrides_title = true
+	file_dialog.title = message
+	file_dialog.file_mode = FileDialog.FILE_MODE_OPEN_FILE
+	file_dialog.filters = ["*.tscn","*.scn"]
+	file_dialog.connect("file_selected", set_test_scene_path)
+	EditorInterface.popup_dialog_centered(file_dialog, Vector2i(300, 400))
+
+func set_test_scene_path(path:String):
+	var current_scene := EditorInterface.get_edited_scene_root()
+	current_scene.set_meta(META_NAME, path)
+	run_test_scene()