Adds unit tests for deepskylog_interface

Introduces a suite of unit tests for the deepskylog_interface module.
These tests cover successful API calls, error handling for various API failures (authentication, connection, timeout, and malformed JSON), and the magnification calculation functions. This ensures the reliability and robustness of the interface.

Author: WimDeMeester

pydeepskylog/tests/test_deepskylog_interface.py

@@ -0,0 +1,73 @@
+import unittest
+from unittest.mock import patch, Mock
+import pydeepskylog.deepskylog_interface as dsl
+
+class TestDeepskylogInterface(unittest.TestCase):
+    def setUp(self):
+        # Clear cache before each test
+        dsl._DSL_API_CACHE.clear()
+
+    @patch('pydeepskylog.deepskylog_interface.requests.get')
+    def test_dsl_instruments_success(self, mock_get):
+        mock_get.return_value = Mock(
+            status_code=200,
+            json=Mock(return_value={'1': {'id': 1, 'name': 'Scope'}})
+        )
+        result = dsl.dsl_instruments('user')
+        self.assertIn('1', result)
+        self.assertEqual(result['1']['name'], 'Scope')
+
+    @patch('pydeepskylog.deepskylog_interface.requests.get')
+    def test_dsl_eyepieces_success(self, mock_get):
+        mock_get.return_value = Mock(
+            status_code=200,
+            json=Mock(return_value={'2': {'id': 2, 'name': 'Plossl'}})
+        )
+        result = dsl.dsl_eyepieces('user')
+        self.assertIn('2', result)
+        self.assertEqual(result['2']['name'], 'Plossl')
+
+    @patch('pydeepskylog.deepskylog_interface.requests.get')
+    def test_api_authentication_error(self, mock_get):
+        mock_get.return_value = Mock(status_code=401, raise_for_status=Mock())
+        with self.assertRaises(PermissionError):
+            dsl.dsl_instruments('user')
+
+    @patch('pydeepskylog.deepskylog_interface.requests.get')
+    def test_api_connection_error(self, mock_get):
+        mock_get.side_effect = dsl.requests.exceptions.ConnectionError
+        with self.assertRaises(ConnectionError):
+            dsl.dsl_instruments('user')
+
+    @patch('pydeepskylog.deepskylog_interface.requests.get')
+    def test_api_timeout(self, mock_get):
+        mock_get.side_effect = dsl.requests.exceptions.Timeout
+        with self.assertRaises(ConnectionError):
+            dsl.dsl_instruments('user')
+
+    @patch('pydeepskylog.deepskylog_interface.requests.get')
+    def test_api_malformed_json(self, mock_get):
+        mock_get.return_value = Mock(status_code=200, json=Mock(side_effect=ValueError))
+        with self.assertRaises(RuntimeError):
+            dsl.dsl_instruments('user')
+
+    def test_calculate_magnifications(self):
+        instrument = {"fixedMagnification": None, "diameter": 100, "fd": 8}
+        eyepieces = [
+            {"eyepieceactive": True, "focal_length_mm": 20},
+            {"eyepieceactive": False, "focal_length_mm": 10},
+            {"eyepieceactive": True, "focal_length_mm": 10},
+        ]
+        mags = dsl.calculate_magnifications(instrument, eyepieces)
+        self.assertEqual(mags, [40.0, 80.0])
+
+    def test_calculate_magnifications_fixed(self):
+        instrument = {"fixedMagnification": 50, "diameter": 100, "fd": 8}
+        eyepieces = [
+            {"eyepieceactive": True, "focal_length_mm": 20},
+        ]
+        mags = dsl.calculate_magnifications(instrument, eyepieces)
+        self.assertEqual(mags, [50])
+
+if __name__ == '__main__':
+    unittest.main()