How to translate a trigger entry in automations.yaml into a test event?

I defined in automations.yaml a trigger and an action

- id: test telegram
    - platform: state
      entity_id: sensor.fuite_cuisine
      to: "true"
    service: notify.telegram
      title: '*Send a message*'
      message: "That's an example that _sends_ a *formatted* message with a custom inline keyboard."
          - 'Task 1:/command1, Task 2:/command2'
          - 'Task 3:/command3, Task 4:/command4'

I now would like to switch the state of sensor.fuite_cuisine to test the message delivery. How to do that?

I went to Dev Tools - Events and chose state_changed as the Event Type but do not know what to actually put in the JSON payload?

I tried {"entity_id":"sensor.fuite_cuisine","new_state":{"state":true}} which triggered the following event, visible in the listener on the same page:

    "event_type": "state_changed",
    "data": {
        "entity_id": "sensor.fuite_cuisine",
        "new_state": {
            "state": true
    "origin": "REMOTE",
    "time_fired": "2019-06-10T11:51:54.414455+00:00",
    "context": {
        "id": "fae9a2eb47ba4c89ba91c6506a9c449d",
        "parent_id": null,
        "user_id": "7f8306dc8dff43db960be270adfcdfee"

but this did not trigger the automation.

I believe the issue is with the test payload (I do not have right now access to the actual device which i could put on some water to physically trigger an event). Any help is appreciated.

Note: the telegram notification seems to be correctly set up as sending a predefined event (DevTools - Services - telegram_bot.send_message) works.

Simply go to Dev Tools/states, klick your sensor, scroll to the top, edit the state and klick ‘SET STATE’.
I test all my automations with this method.