esphome/tests/component_tests/text/test_text.yaml

esphome:
  name: test

esp32:
  board: esp32dev

text:
  - platform: template
    name: "test 1 text"
    id: "it_1"
    optimistic: true
    mode: text

  - platform: template
    name: "test 2 text"
    id: "it_2"
    icon: "mdi:text"
    optimistic: true
    min_length: 5
    max_length: 255
    internal: false
    initial_value: "Welcome ESPHOME"
    restore_value: true
    mode: text

  - platform: template
    name: "test 3 key"
    id: "it_3"
    icon: "mdi:text"
    mode: "password"
    optimistic: true
    internal: true
    max_length: 255

  - platform: template
    name: "test 4 key"
    id: "it_4"
    mode: text
    set_action:
      - then:
          - logger.log:
              format: Template text set to %s
              args: ["x.c_str()"]
    lambda: |
      return std::string{"Hello"};