esphome/tests/components/template/test.all.yaml

sensor:
  - platform: template
    name: "Template Sensor"
    id: template_sens
    lambda: |-
      if (id(some_binary_sensor).state) {
        return 42.0;
      } else {
        return 0.0;
      }      
    update_interval: 60s

esphome:
  on_boot:
    - sensor.template.publish:
        id: template_sens
        state: 42.0

    # Templated
    - sensor.template.publish:
        id: template_sens
        state: !lambda "return 42.0;"

    - datetime.date.set:
        id: test_date
        date:
          year: 2021
          month: 1
          day: 1
    - datetime.date.set:
        id: test_date
        date: !lambda "return {.day_of_month = 1, .month = 1, .year = 2021};"
    - datetime.date.set:
        id: test_date
        date: "2021-01-01"

binary_sensor:
  - platform: template
    id: some_binary_sensor
    name: "Garage Door Open"
    lambda: |-
      if (id(template_sens).state > 30) {
        // Garage Door is open.
        return true;
      } else {
        // Garage Door is closed.
        return false;
      }      

output:
  - platform: template
    id: outputsplit
    type: float
    write_action:
      - logger.log: "write_action"

switch:
  - platform: template
    name: "Template Switch"
    lambda: |-
      if (id(some_binary_sensor).state) {
        return true;
      } else {
        return false;
      }      
    turn_on_action:
      - logger.log: "turn_on_action"
    turn_off_action:
      - logger.log: "turn_off_action"

button:
  - platform: template
    name: "Template Button"
    on_press:
      - logger.log: Button Pressed

cover:
  - platform: template
    name: "Template Cover"
    lambda: |-
      if (id(some_binary_sensor).state) {
        return COVER_OPEN;
      } else {
        return COVER_CLOSED;
      }      
    open_action:
      - logger.log: open_action
    close_action:
      - logger.log: close_action
    stop_action:
      - logger.log: stop_action
    optimistic: true

number:
  - platform: template
    name: "Template number"
    optimistic: true
    min_value: 0
    max_value: 100
    step: 1

select:
  - platform: template
    name: "Template select"
    optimistic: true
    options:
      - one
      - two
      - three
    initial_option: two

lock:
  - platform: template
    name: "Template Lock"
    lambda: |-
      if (id(some_binary_sensor).state) {
        return LOCK_STATE_LOCKED;
      } else {
        return LOCK_STATE_UNLOCKED;
      }      
    lock_action:
      - logger.log: lock_action
    unlock_action:
      - logger.log: unlock_action
    open_action:
      - logger.log: open_action

text:
  - platform: template
    name: "Template text"
    optimistic: true
    min_length: 0
    max_length: 100
    mode: text

alarm_control_panel:
  - platform: template
    name: Alarm Panel
    codes:
      - "1234"

datetime:
  - platform: template
    name: Date
    id: test_date
    type: date
    set_action:
      - logger.log: "set_value"
    on_value:
      - logger.log:
          format: "Date: %04d-%02d-%02d"
          args:
            - x.year
            - x.month
            - x.day_of_month