Prevent reference sharing between entry and data (#1571)

* Prevent reference sharing between entry and data

Change detection doesn't work when updating the self._data also updates self._entry.data because the reference to the cpid key is the same list. This prevents the data being persisted to disk.

* cleanup testing code

* Whitespace cleanup

* Whitespace cleanup

Author: Mark-Hetherington

custom_components/ocpp/config_flow.py

@@ -1,6 +1,7 @@
 """Adds config flow for ocpp."""
 
 from typing import Any
+from copy import deepcopy
 from homeassistant.config_entries import (
     ConfigEntry,
     ConfigFlow,
@@ -140,6 +141,7 @@ async def async_step_integration_discovery(
         self._entry = discovery_info["entry"]
         self._cp_id = discovery_info["cp_id"]
         self._data = {**self._entry.data}
+        self._data = deepcopy(self._data)
 
         await self.async_set_unique_id(self._cp_id)
         # Abort the flow if a config entry with the same unique ID exists