diff --git a/tests/unit_tests/fixtures/core/config/device_duplicate_id.yaml b/tests/unit_tests/fixtures/core/config/device_duplicate_id.yaml
new file mode 100644
index 0000000000..345d05502f
--- /dev/null
+++ b/tests/unit_tests/fixtures/core/config/device_duplicate_id.yaml
@@ -0,0 +1,10 @@
+esphome:
+  name: test
+  devices:
+    - id: duplicate_device
+      name: "Device 1"
+    - id: duplicate_device
+      name: "Device 2"
+
+esp32:
+  board: esp32dev
\ No newline at end of file