diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 22eaef8..03bc6bd 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -26,6 +26,10 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - id: test
+            file: tests/test.esp32_ard.notime.yaml
+            name: Test tests/test.esp32_ard.notime.yaml
+            pio_cache_key: test.esp32_ard.notime
           - id: test
             file: tests/test.esp32_ard.uart.yaml
             name: Test tests/test.esp32_ard.uart.yaml
diff --git a/tests/test.esp32_ard.notime.yaml b/tests/test.esp32_ard.notime.yaml
new file mode 100644
index 0000000..918b7f5
--- /dev/null
+++ b/tests/test.esp32_ard.notime.yaml
@@ -0,0 +1,34 @@
+esphome:
+  name: "esp32-ard-notime"
+
+external_components:
+  - source:
+      type: local
+      path: ../components
+    components: ["truma_inetbox", "uart"]
+
+esp32:
+  board: esp32dev
+  framework:
+    type: arduino
+
+uart: !include test.common.uart.yaml
+truma_inetbox:
+  uart_id: lin_uart_bus
+  cs_pin: 5
+  fault_pin: 18
+  # Advanced users can use `on_heater_message` action. The heater data is in the `message` variable.
+  on_heater_message:
+    then:
+    - logger.log: "Message from CP Plus."
+    - if:
+        condition:
+          lambda: return message->operating_status == truma_inetbox::OperatingStatus::OPERATING_STATUS_OFF;
+        then:
+          - logger.log: "Heater is off."
+binary_sensor: !include test.common.binary_sensor.yaml
+button: !include test.common.button.yaml
+climate: !include test.common.climate.yaml
+number: !include test.common.number.yaml
+sensor: !include test.common.sensor.yaml
+switch: !include test.common.switch.yaml
\ No newline at end of file