feat: implement mvp with email-first login flow and langgraph architecture

tests/test_auth.py

@@ -0,0 +1,43 @@
+import pytest
+from unittest.mock import MagicMock, patch
+from ea_chatbot.auth import OIDCClient
+
+@patch("ea_chatbot.auth.OAuth2Session")
+def test_oidc_client_initialization(mock_oauth):
+    client = OIDCClient(
+        client_id="test_id",
+        client_secret="test_secret",
+        server_metadata_url="https://test.server/.well-known/openid-configuration"
+    )
+    assert client.oauth_session is not None
+
+@patch("ea_chatbot.auth.requests")
+@patch("ea_chatbot.auth.OAuth2Session")
+def test_get_login_url(mock_oauth_cls, mock_requests):
+    # Setup mock session
+    mock_session = MagicMock()
+    mock_oauth_cls.return_value = mock_session
+    
+    # Mock metadata response
+    mock_response = MagicMock()
+    mock_response.json.return_value = {
+        "authorization_endpoint": "https://test.server/auth",
+        "token_endpoint": "https://test.server/token",
+        "userinfo_endpoint": "https://test.server/userinfo"
+    }
+    mock_requests.get.return_value = mock_response
+    
+    # Mock authorization url generation
+    mock_session.create_authorization_url.return_value = ("https://test.server/auth?response_type=code", "state")
+
+    client = OIDCClient(
+        client_id="test_id",
+        client_secret="test_secret",
+        server_metadata_url="https://test.server/.well-known/openid-configuration"
+    )
+    
+    url = client.get_login_url()
+    
+    assert url == "https://test.server/auth?response_type=code"
+    # Verify metadata was fetched via requests
+    mock_requests.get.assert_called_with("https://test.server/.well-known/openid-configuration")