Godot Testing Example

godot_testing_example.sh

rm -rf * .godot
wget -O project.godot \
    https://gist.githubusercontent.com/WillSams/a6e3b853595ea6123b5a506acc0ba0a3/raw/f2fab5899029594d66bcba18a2b62cc62927fe81/generic_godot.settings

# download the textures
mkdir {scenes,textures}
wget -O textures/icon.png \
    https://github.com/godotengine/godot/blob/master/icon.png?raw=true
wget  -O textures/light.png \
  https://clipground.com/images/white-light-png-9.png

mkdir -p {scenes,specs,textures}/entities

wget https://github.com/godotengine/godot-docs-project-starters/releases/download/latest-4.x/2d_sprite_animation_assets.zip
unzip -j 2d_sprite_animation_assets.zip '**/run_animation/*' -d textures/entities/player
rm 2d_sprite_animation_assets.zip

wget -O specs/asserts.gd \
  https://gist.githubusercontent.com/WillSams/9e0ea2f83f184175412bc6fdfe8238e5/raw/b6d52d33e06c7f7293aee17a60d0fe347dc2c676/asserts.gd

echo "Create a scene...."

echo "echo "extends CharacterBody2D

@export var animated_sprite: AnimatedSprite2D

var animations: SpriteFrames = SpriteFrames.new()

func load_image_texture(img: String) -> ImageTexture:
  var texture_path = 'res://textures/%s.png' % img
  var image = Image.new()
  var err = image.load(texture_path)
  if err != OK:
    var Errors = Engine.get_singleton('Errors')
    push_error('Failed to load texture %s' % [texture_path, Errors.get_message(err)])
    return null
  return ImageTexture.create_from_image(image)

func _enter_tree():
  const duration = 1.0
  animations.add_animation('run')
  var images = [
    'entities/player/run-1',
    'entities/player/run-2',
    'entities/player/run-3',
    'entities/player/run-4',
    'entities/player/run-5',
    'entities/player/run-6',
    'entities/player/run-7',
    'entities/player/run-8'
  ]
  for img in images:
    animations.add_frame('run', load_image_texture(img), duration)

  if not is_instance_valid(animated_sprite):
    push_error('AnimatedSprite2D is not a valid instance')
    return

  animated_sprite.sprite_frames = animations
  animated_sprite.autoplay = 'run'
  animated_sprite.speed_scale = 2

func _ready():
  if not is_instance_valid(animated_sprite):
    push_error('AnimatedSprite2D is not a valid instance')
    return

  animated_sprite.position = Vector2(433, 274)

func _process(_delta):
  if not is_instance_valid(animated_sprite):
    push_error('AnimatedSprite2D is not a valid instance')
    return

  if Input.is_action_pressed('right'): animated_sprite.play('run')
  else: animated_sprite.stop()" >| scenes/main.gd
        
godot4 scenes/main.tscn

echo "Testing example below..."

echo "var MainScene = load('res://scenes/main.gd').new()
var _asserts = load('res://specs/asserts.gd').new()

func load_image_texture_should_not_return_null_for_valid_image():
  if MainScene:
    var image: ImageTexture = MainScene.load_image_texture('entities/player/run-1')
    if image:
      _asserts.assert_not_null(image)
      MainScene.free()

func cleanup():
  if MainScene != null:
    MainScene.queue_free()
    MainScene = null

func run():
  if MainScene:
    load_image_texture_should_not_return_null_for_valid_image()
    cleanup()
  else: print('MainScene is not a valid instance')" >| specs/main.spec.gd

echo "extends SceneTree

var _main_spec = load('res://specs/main.spec.gd').new()

func _init():
  _main_spec.run()
  quit()" >| specs/runner.gd

godot4 --headless -s specs/runner.gd  # make fail, then make pass