refactor: minor code updates

.gitlab-ci.yml

@@ -31,4 +31,4 @@ lint-test-job:   # This job also runs in the test stage.
     - pip install -e .
     - flake8 --docstring-convention google term_frag_sel/ tests/
     - pylint term_frag_sel/ tests/
-    - mypy term_frag_sel/
+    - mypy term_frag_sel/ tests/

setup.py

 """Set up project."""
 from pathlib import Path
-from setuptools import setup, find_packages
+from setuptools import setup, find_packages  # type: ignore
 
 project_root_dir = Path(__file__).parent.resolve()
 with open(project_root_dir / "requirements.txt",

tests/test_frag.py

 """Test utils.py functions."""
-import pandas as pd
+import pandas as pd  # type: ignore
 import pytest
-from Bio import SeqIO
+from Bio import SeqIO  # type: ignore
 
 from term_frag_sel.fragmentation import fragmentation