Run with pytest

Author: Florents-Tselai

.github/workflows/test.yml

@@ -25,5 +25,5 @@ jobs:
         pip install '.[test]'
     - name: Run tests
       run: |
-        python -m unittest tests/test_tsellm.py
-
+#        python -m unittest tests/test_tsellm.py
+        pytest