added a test file

caimira/tests/test_data_service.py

@@ -0,0 +1,87 @@
+from dataclasses import dataclass
+
+import unittest
+from unittest.mock import patch, MagicMock
+from tornado.httpclient import HTTPError
+
+from caimira.apps.calculator.data_service import DataService
+
+@dataclass
+class MockResponse:
+    body: str
+
+class DataServiceTests(unittest.TestCase):
+    def setUp(self):
+        # Set up any necessary test data or configurations
+        self.credentials = {
+            "data_service_client_email": "test@example.com",
+            "data_service_client_password": "password123"
+        }
+        self.data_service = DataService(self.credentials)
+
+    @patch('caimira.apps.calculator.data_service.AsyncHTTPClient')
+    async def test_login_successful(self, mock_http_client):
+        # Mock successful login response
+        mock_response = MockResponse('{"access_token": "dummy_token"}')
+        mock_fetch = MagicMock(return_value=mock_response)
+        mock_http_client.return_value.fetch = mock_fetch
+
+        # Call the login method
+        access_token = await self.data_service.login()
+
+        # Assert that the access token is returned correctly
+        self.assertEqual(access_token, "dummy_token")
+
+        # Verify that the fetch method was called with the expected arguments
+        mock_fetch.assert_called_once_with(
+            url='https://caimira-data-api.app.cern.ch/login',
+            method='POST',
+            headers={'Content-type': 'application/json'},
+            body='{"email": "test@example.com", "password": "password123"}'
+        )
+
+    @patch('caimira.apps.calculator.data_service.AsyncHTTPClient')
+    async def test_login_error(self, mock_http_client):
+        # Mock login error response
+        mock_fetch = MagicMock(side_effect=HTTPError(500))
+        mock_http_client.return_value.fetch = mock_fetch
+
+        # Call the login method
+        access_token = await self.data_service.login()
+
+        # Assert that the login method returns None in case of an error
+        self.assertIsNone(access_token)
+
+    @patch('caimira.apps.calculator.data_service.AsyncHTTPClient')
+    async def test_fetch_successful(self, mock_http_client):
+        # Mock successful fetch response
+        mock_response = MockResponse('{"data": "dummy_data"}')
+        mock_fetch = MagicMock(return_value=mock_response)
+        mock_http_client.return_value.fetch = mock_fetch
+
+        # Call the fetch method with a mock access token
+        access_token = "dummy_token"
+        data = await self.data_service.fetch(access_token)
+
+        # Assert that the data is returned correctly
+        self.assertEqual(data, {"data": "dummy_data"})
+
+        # Verify that the fetch method was called with the expected arguments
+        mock_fetch.assert_called_once_with(
+            url='https://caimira-data-api.app.cern.ch/data',
+            method='GET',
+            headers={'Authorization': 'Bearer dummy_token'}
+        )
+
+    @patch('caimira.apps.calculator.data_service.AsyncHTTPClient')
+    async def test_fetch_error(self, mock_http_client):
+        # Mock fetch error response
+        mock_fetch = MagicMock(side_effect=HTTPError(404))
+        mock_http_client.return_value.fetch = mock_fetch
+
+        # Call the fetch method with a mock access token
+        access_token = "dummy_token"
+        data = await self.data_service.fetch(access_token)
+
+        # Assert that the fetch method returns None in case of an error
+        self.assertIsNone(data)