fix: resolve linting issues in test files

Co-authored-by: jmeridth <[email protected]>

Author: Copilot

test_assignee_functionality.py

@@ -4,6 +4,7 @@
 import unittest
 from unittest.mock import patch
 
+from classes import IssueWithMetrics
 from markdown_writer import get_non_hidden_columns
 
 
@@ -97,14 +98,16 @@ def test_assignee_column_position(self):
 
     def test_multiple_assignees_rendering_logic(self):
         """Test that multiple assignees are rendered correctly in assignee column."""
-        from io import StringIO
-
-        from classes import IssueWithMetrics
 
         # Test the assignee rendering logic directly
         endpoint = "github.com"
         columns = ["Title", "URL", "Assignee", "Author"]
 
+        # Initialize variables
+        multiple_output = ""
+        single_output = ""
+        none_output = ""
+
         # Test case 1: Multiple assignees
         issue_multiple = IssueWithMetrics(
             title="Test Issue with Multiple Assignees",
@@ -125,7 +128,10 @@ def test_multiple_assignees_rendering_logic(self):
             else:
                 multiple_output = " None |"
 
-        expected_multiple = " [alice](https://github.com/alice), [bob](https://github.com/bob), [charlie](https://github.com/charlie) |"
+        expected_multiple = (
+            " [alice](https://github.com/alice), [bob](https://github.com/bob), "
+            "[charlie](https://github.com/charlie) |"
+        )
         self.assertEqual(
             multiple_output,
             expected_multiple,

test_markdown_writer.py

@@ -255,7 +255,8 @@ def test_write_to_markdown_with_vertical_bar_in_title(self):
             "| Issue 1 | https://github.com/user/repo/issues/1 | [charlie](https://github.com/charlie) | "
             "[alice](https://github.com/alice) | 1 day, 0:00:00 | 2 days, 0:00:00 | 3 days, 0:00:00 | "
             "1 day, 0:00:00 | 1 day, 0:00:00 | -5 days, 0:00:00 |\n"
-            "| feat| Issue 2 | https://github.com/user/repo/issues/2 | None | [bob](https://github.com/bob) | 3 days, 0:00:00 | "
+            "| feat| Issue 2 | https://github.com/user/repo/issues/2 | None | "
+            "[bob](https://github.com/bob) | 3 days, 0:00:00 | "
             "4 days, 0:00:00 | 5 days, 0:00:00 | None | 2 days, 0:00:00 | -5 days, 0:00:00 |\n\n"
             "_This report was generated with the [Issue Metrics Action](https://github.com/github/issue-metrics)_\n"
         )