Fix tests

Author: veghp

.github/workflows/build.yml

@@ -21,5 +21,4 @@ jobs:
           pip install -e .
       - name: Test with pytest
         run: |
-          cd python_codon_tables
           python -m pytest

tests/test_basics.py

@@ -1,6 +1,7 @@
 """Basic tests to check that the main examples work."""
 
 import os
+import pytest
 import python_codon_tables as pct