I still don't know how this works

Added CI/CD, most tests, and linted properly.

term_frag_sel/cli.py

@@ -6,8 +6,8 @@ import numpy as np
 import pandas as pd
 from pathlib import Path
 
-from fragmentation import fragmentation
-from utils import check_positive, check_prob
+from term_frag_sel.fragmentation import fragmentation
+from term_frag_sel.utils import check_positive, check_prob
 
 
 def main(args: argparse.Namespace):
@@ -62,7 +62,7 @@ def file_validation(fasta_file: str,
     with open(fasta_file, "r") as handle:
         fasta = SeqIO.parse(handle, "fasta")
     if not any(fasta):
-        logger.exception("Input FASTA file is either empty or \
+        raise ValueError("Input FASTA file is either empty or \
             incorrect file type.")
 
     count_path = Path(counts_file)