Use difflib to print output differences

Author: TylerYep

tests/conftest.py

@@ -1,6 +1,7 @@
 """ conftest.py """
 import sys
 import warnings
+from difflib import Differ
 from pathlib import Path
 from typing import Iterator
 
@@ -59,13 +60,14 @@ def verify_output_str(output: str, filename: str) -> None:
     with open(filename, encoding="utf-8") as output_file:
         expected = output_file.read()
     if output != expected:
-        print(f"Expected:\n{expected}\nGot:\n{output}")
+        print("\n".join(Differ().compare(output.splitlines(), expected.splitlines())))
     assert output == expected
     for category in (ColumnSettings.NUM_PARAMS, ColumnSettings.MULT_ADDS):
         assert_sum_column_totals_match(output, category)
 
 
 def get_column_value_for_row(line: str, offset: int) -> int:
+    """Helper function for getting the column totals."""
     col_value = line[offset:]
     end = col_value.find(" ")
     if end != -1:
@@ -80,6 +82,7 @@ def get_column_value_for_row(line: str, offset: int) -> int:
 
 
 def assert_sum_column_totals_match(output: str, category: ColumnSettings) -> None:
+    """Asserts that column totals match the total from the table summary."""
     lines = output.replace("=", "").split("\n\n")
     header_row = lines[0].strip()
     offset = header_row.find(HEADER_TITLES[category])