esphome/tests/components/event/common.yaml

event:
  - platform: template
    name: Event
    id: some_event
    event_types:
      - template_event_type1
      - template_event_type2
    on_event:
      - logger.log: Event fired
      - lambda: |-
          // Test get_last_event_type() returns StringRef
          if (id(some_event).has_event()) {
            auto event_type = id(some_event).get_last_event_type();
            // Compare with string literal using ==
            if (event_type == "template_event_type1") {
              ESP_LOGD("test", "Event type is template_event_type1");
            }
            // Log using %.*s format for StringRef
            ESP_LOGD("test", "Event type: %.*s", (int) event_type.size(), event_type.c_str());
          }

  - platform: template
    name: Other Event
    id: other_event
    event_types:
      - template_event_type1

button:
  - platform: template
    name: Trigger Event
    on_press:
      - event.trigger:
          id: some_event
          event_type: template_event_type1
      - event.trigger:
          id: some_event
          event_type: !lambda |-
            return id(some_event).has_event() ? "template_event_type2" : "template_event_type1";

  - platform: template
    name: Event Types Lambdas
    on_press:
      - lambda: |-
          // How external components and configs read and set event types
          const auto &types = id(some_event).get_event_types();
          for (const char *type : types)
            ESP_LOGD("test", "%s", type);
          if (types.empty()) {
            ESP_LOGD("test", "no types");
          } else if (types.size() > 1) {
            ESP_LOGD("test", "%s %s", types[0], types.at(1));
            const auto *it = std::find(types.begin(), types.end(), types[1]);
            ESP_LOGD("test", "Index %d", (int) (it - types.begin()));
          }
          id(other_event).set_event_types(id(some_event).get_event_types());
          id(other_event).set_event_types({"other_a", "other_b"});