added mock unit test

tests/unit_tests/test_sage.py

@@ -0,0 +1,21 @@
+import unittest
+from pathlib import Path
+
+import pandas as pd
+from spectrum_fundamentals.search_result import Sage
+
+
+class TestSage(unittest.TestCase):
+    """Test vlass to check Sage search result processing."""
+
+    def test_read_sage(self):
+        """Test function for reading sage results and transforming to Prosit format."""
+        sage_output_path = Path(__file__.parent / "data" / "sage_output.tsv")
+        expected_sage_internal_path = Path(__file__.parent / "data" / "sage_output_internal.csv")
+
+        internal_search_results_df = Sage.read_result(sage_output_path)
+
+        # execute only once, then remove and test again
+        internal_search_results_df.to_csv(expected_sage_internal_path)
+
+        self.assertEqual(internal_search_results_df, pd.read_csv(expected_sage_internal_path))