src/db_utils/config.py: add a test_files attribute for Config class

src/db_utils/config.py

@@ -24,3 +24,4 @@ class Config:
     splicing_projects = data / 'splicing_lore_data' / \
         'splicing_lore_projects.txt'
     chia_pet_files = data / 'interactions_files' / 'chia_pet'
+    tests_files = Path(__file__).parents[2] / 'tests' / "files"
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