SMA code quality improvement and bugfix (#49346)

* Minor code quality improvements
Thanks to @MartinHjelmare

* Convert legacy dict config to list

* Improved test

* Typo

* Test improvements

* Create fixtures in conftest.py

tests/components/sma/conftest.py

@@ -0,0 +1,33 @@
+"""Fixtures for sma tests."""
+from unittest.mock import patch
+
+import pytest
+
+from homeassistant.components.sma.const import DOMAIN
+
+from . import MOCK_CUSTOM_SETUP_DATA, MOCK_DEVICE
+
+from tests.common import MockConfigEntry
+
+
+@pytest.fixture
+def mock_config_entry():
+    """Return the default mocked config entry."""
+    return MockConfigEntry(
+        domain=DOMAIN,
+        title=MOCK_DEVICE["name"],
+        unique_id=MOCK_DEVICE["serial"],
+        data=MOCK_CUSTOM_SETUP_DATA,
+        source="import",
+    )
+
+
+@pytest.fixture
+async def init_integration(hass, mock_config_entry):
+    """Create a fake SMA Config Entry."""
+    mock_config_entry.add_to_hass(hass)
+
+    with patch("pysma.SMA.read"):
+        await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+    return mock_config_entry