Add test pipeline step and a basic test

app/tests/test_discord_client.py

@@ -0,0 +1,44 @@
+import os
+from unittest import mock
+
+import pytest
+import requests_mock
+from requests import HTTPError
+
+from app.discord_client import DiscordClient
+from app.twitch_client import StreamInformation
+
+
+def test_require_webhook_url():
+    with pytest.raises(KeyError):
+        DiscordClient()
+
+
+def test_send_information_to_discord_fails(mock_loggers):
+    stream = StreamInformation(
+        user_id="",
+        user_name="",
+        user_login="",
+        game_name="",
+        started_at="",
+        title="",
+        viewer_count=0,
+        _thumbnail_url=""
+    )
+
+    with (
+        mock.patch.dict(os.environ, {"DISCORD_WEBHOOK_URL": "https://test"}),
+        requests_mock.Mocker() as requests_mocker,
+    ):
+        requests_mocker.post(url="https://test", status_code=400)
+
+        discord_client = DiscordClient()
+        with pytest.raises(HTTPError):
+            discord_client.send_information_to_discord(
+                stream=stream, profile_image=""
+            )
+
+    assert len(mock_loggers.info_logger.call_args_list) == 1
+    assert mock_loggers.info_logger.call_args.args[0] == (
+        "Sending a message with an embed to the webhook..."
+    )