Add tests for samsungtv diagnostics (#66563)

* Add tests for samsungtv diagnostics

* Adjust coveragerc

* Adjust type hints

Co-authored-by: epenet <epenet@users.noreply.github.com>

.coveragerc

@@ -947,7 +947,6 @@ omit =
     homeassistant/components/sabnzbd/*
     homeassistant/components/saj/sensor.py
     homeassistant/components/samsungtv/bridge.py
-    homeassistant/components/samsungtv/diagnostics.py
     homeassistant/components/satel_integra/*
     homeassistant/components/schluter/*
     homeassistant/components/scrape/sensor.py

tests/components/samsungtv/test_diagnostics.py

@@ -0,0 +1,58 @@
+"""Test samsungtv diagnostics."""
+from aiohttp import ClientSession
+import pytest
+
+from homeassistant.components.diagnostics import REDACTED
+from homeassistant.components.samsungtv import DOMAIN
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+from tests.components.diagnostics import get_diagnostics_for_config_entry
+from tests.components.samsungtv.test_media_player import MOCK_ENTRY_WS_WITH_MAC
+
+
+@pytest.fixture(name="config_entry")
+def get_config_entry(hass: HomeAssistant) -> ConfigEntry:
+    """Create and register mock config entry."""
+    config_entry = MockConfigEntry(
+        domain=DOMAIN,
+        data=MOCK_ENTRY_WS_WITH_MAC,
+        entry_id="123456",
+        unique_id="any",
+    )
+    config_entry.add_to_hass(hass)
+    return config_entry
+
+
+@pytest.mark.usefixtures("remotews")
+async def test_entry_diagnostics(
+    hass: HomeAssistant, config_entry: ConfigEntry, hass_client: ClientSession
+) -> None:
+    """Test config entry diagnostics."""
+    await hass.config_entries.async_setup(config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert await get_diagnostics_for_config_entry(hass, hass_client, config_entry) == {
+        "entry": {
+            "data": {
+                "host": "fake_host",
+                "ip_address": "test",
+                "mac": "aa:bb:cc:dd:ee:ff",
+                "method": "websocket",
+                "name": "fake",
+                "port": 8002,
+                "token": REDACTED,
+            },
+            "disabled_by": None,
+            "domain": "samsungtv",
+            "entry_id": "123456",
+            "options": {},
+            "pref_disable_new_entities": False,
+            "pref_disable_polling": False,
+            "source": "user",
+            "title": "Mock Title",
+            "unique_id": "any",
+            "version": 2,
+        }
+    }