diff --git a/podme_api/client.py b/podme_api/client.py
index d50fef3..a190805 100644
--- a/podme_api/client.py
+++ b/podme_api/client.py
@@ -202,7 +202,7 @@ async def _request(  # noqa: C901
             raise PodMeApiConnectionTimeoutError(
                 "Timeout occurred while connecting to the PodMe API"
             ) from exception
-        except (ClientError, socket.gaierror) as exception:  # pragma: no cover
+        except (ClientError, socket.gaierror) as exception:
             raise PodMeApiConnectionError(
                 "Error occurred while communicating with the PodMe API"
             ) from exception
diff --git a/tests/conftest.py b/tests/conftest.py
index 582e94c..995b8cb 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -95,13 +95,6 @@ def expired_credentials():
     return SchibstedCredentials.from_dict(data)
 
 
-@pytest.fixture
-def invalid_credentials():
-    data = load_fixture_json("default_credentials")
-    data["access_token"] = data["access_token"] + "_refreshed"
-    return SchibstedCredentials.from_dict(data)
-
-
 @pytest.fixture
 def refreshed_credentials(default_credentials):
     data = load_fixture_json("default_credentials")
diff --git a/tests/test_client.py b/tests/test_client.py
index 6867af5..b41c182 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -6,8 +6,9 @@
 from datetime import time
 import logging
 from pathlib import Path
+import socket
 import tempfile
-from unittest.mock import AsyncMock, Mock, call
+from unittest.mock import AsyncMock, Mock, call, patch
 
 import aiohttp
 from aiohttp.web_response import Response, json_response
@@ -111,6 +112,24 @@ async def test_credentials_storage(
             result = await client.get_username()
             assert result == "testuser@example.com"
 
+        # Test loading and saving credentials with specified filename
+        async with podme_client(
+            load_default_user_credentials=False,
+            conf_dir=tempdir,
+        ) as client:
+            client: PodMeClient
+            # Loading
+            creds_file = Path(tempdir) / "credentials.json"
+            stored_credentials = SchibstedCredentials.from_json(creds_file.read_text(encoding="utf-8"))
+            await client.load_credentials(creds_file)
+            assert client.auth_client.get_credentials() == stored_credentials.to_dict()
+
+            # Saving
+            creds_file_alt = creds_file.with_name("credentials2")
+            await client.save_credentials(creds_file_alt)
+            stored_credentials = SchibstedCredentials.from_json(creds_file_alt.read_text(encoding="utf-8"))
+            assert client.auth_client.get_credentials() == stored_credentials.to_dict()
+
 
 async def test_get_user_subscription(aresponses: ResponsesMockServer, podme_client):
     fixture = load_fixture_json("subscription")
@@ -897,6 +916,17 @@ async def test_json_error(aresponses: ResponsesMockServer, podme_client):
             assert await client._request("user")
 
 
+async def test_network_error(podme_client):
+    """Test network error handling."""
+    async with podme_client() as client:
+        client: PodMeClient
+        client.session = AsyncMock(spec=aiohttp.ClientSession)
+        with patch.object(client.session, "request", side_effect=socket.gaierror), pytest.raises(
+            PodMeApiConnectionError
+        ):
+            assert await client._request("user")
+
+
 async def test_unexpected_error(aresponses: ResponsesMockServer, podme_client):
     """Test unexpected error handling."""
     aresponses.add(