esphome/tests/components/online_image/common.yaml

wifi:
  ssid: MySSID
  password: password1

# Purposely test that `online_image:` does auto-load `image:`
# Keep the `image:` undefined.
# image:
online_image:
  - id: online_binary_image
    url: http://www.libpng.org/pub/png/img_png/pnglogo-blk-tiny.png
    format: PNG
    type: BINARY
    resize: 50x50
  - id: online_binary_transparent_image
    url: http://www.libpng.org/pub/png/img_png/pnglogo-blk-tiny.png
    type: BINARY
    use_transparency: chroma_key
    format: png
  - id: online_rgba_image
    url: http://www.libpng.org/pub/png/img_png/pnglogo-blk-tiny.png
    format: PNG
    type: RGB
    use_transparency: alpha_channel
  - id: online_rgb24_image
    url: http://www.libpng.org/pub/png/img_png/pnglogo-blk-tiny.png
    format: PNG
    type: RGB
    use_transparency: chroma_key

# Check the set_url action
esphome:
  on_boot:
    then:
      - online_image.set_url:
          id: online_rgba_image
          url: http://www.example.org/example.png
      - online_image.set_url:
          id: online_rgba_image
          url: !lambda |-
            return "http://www.example.org/example.png";
      - online_image.set_url:
          id: online_rgba_image
          url: !lambda |-
            return str_sprintf("http://homeassistant.local:8123");