diff --git a/tests/test3.yaml b/tests/test3.yaml
index c6eab19440..3e61e78acf 100644
--- a/tests/test3.yaml
+++ b/tests/test3.yaml
@@ -122,6 +122,13 @@ sensor:
       name: Color Temperature
     integration_time: 700ms
     gain: 60x
+  - platform: custom
+    lambda: |-
+      auto s = new sensor::Sensor();
+      return {s};
+    sensors:
+      - id: custom_sensor
+        name: Custom Sensor
 
 time:
 - platform: homeassistant
@@ -129,7 +136,7 @@ time:
 apds9960:
   address: 0x20
   update_interval: 60s
-  
+
 mpr121:
   id: mpr121_first
   address: 0x5A
@@ -178,6 +185,13 @@ binary_sensor:
   - platform: ttp229_lsf
     channel: 1
     name: TTP229 LSF Test
+  - platform: custom
+    lambda: |-
+      auto s = new binary_sensor::BinarySensor();
+      return {s};
+    sensors:
+      - id: custom_binary_sensor
+        name: Custom Binary Sensor
 
 remote_receiver:
   pin: GPIO12
@@ -233,6 +247,13 @@ switch:
     id: gpio_switch2
     pin: GPIO1
     interlock: *interlock
+  - platform: custom
+    lambda: |-
+      auto s = new switch::Switch();
+      return {s};
+    sensors:
+      - id: custom_switch
+        name: Custom Switch
 
 stepper:
   - platform: uln2003