test: isolate package unit tests from source tree

package/pytest.ini

@@ -0,0 +1,3 @@
+[pytest]
+testpaths = tests/unit
+pythonpath = src

package/src/pyaslreport/tests/test_package.py → package/tests/unit/test_package_api.py

@@ -1,38 +1,50 @@
+from unittest.mock import MagicMock, patch
+
 import pytest
-from unittest.mock import patch, MagicMock
-from .main import get_bids_metadata
 
-# filepath: /home/ibrahim/MyPc/Projects/GSoC/ASL-Parameter-Generator/package/src/pyaslreport/test_main.py
+from pyaslreport.main import get_bids_metadata
+
 
 def test_get_bids_metadata_success():
     data = {"modality": "asl", "dicom_dir": "/fake/dir"}
     fake_header = MagicMock()
     fake_sequence = MagicMock()
     fake_sequence.extract_bids_metadata.return_value = ("meta", "context")
+
     with patch("pyaslreport.main.get_dicom_header", return_value=fake_header), \
          patch("pyaslreport.main.get_sequence", return_value=fake_sequence):
         result = get_bids_metadata(data)
-        assert result == ("meta", "context")
-        fake_sequence.extract_bids_metadata.assert_called_once()
+
+    assert result == ("meta", "context")
+    fake_sequence.extract_bids_metadata.assert_called_once()
+
 
 def test_get_bids_metadata_no_dicom_dir():
     data = {"modality": "asl"}
+
     with pytest.raises(TypeError):
         get_bids_metadata(data)
 
+
 def test_get_bids_metadata_no_sequence():
     data = {"modality": "asl", "dicom_dir": "/fake/dir"}
     fake_header = MagicMock()
+
     with patch("pyaslreport.main.get_dicom_header", return_value=fake_header), \
-         patch("pyaslreport.main.get_sequence", return_value=None):
+         patch("pyaslreport.main.get_sequence", side_effect=ValueError("No ASL sequence class found that matches the DICOM header")):
         with pytest.raises(ValueError) as exc:
             get_bids_metadata(data)
-        assert "No matching sequence found" in str(exc.value)
+
+    assert "No ASL sequence class found" in str(exc.value)
+
 
 def test_get_bids_metadata_invalid_modality():
     data = {"modality": None, "dicom_dir": "/fake/dir"}
     fake_header = MagicMock()
+
     with patch("pyaslreport.main.get_dicom_header", return_value=fake_header), \
-         patch("pyaslreport.main.get_sequence", return_value=None):
-        with pytest.raises(ValueError):
-            get_bids_metadata(data)
+         patch("pyaslreport.main.get_sequence", side_effect=ValueError("Unsupported modality: None")):
+        with pytest.raises(ValueError) as exc:
+            get_bids_metadata(data)
+
+    assert "Unsupported modality" in str(exc.value)