changed name of output file to default value

tests/test_combine_contributor_files.py

@@ -9,7 +9,7 @@ import tools.combine_contributor_files as combine_contributor_files
 @mock.patch('builtins.open', mock.mock_open(read_data="1\n2\n3\n"))
 def test_process_input_files(mock_exists):
     # Setup
-    test_args = ["script_name", "--input_files", "file1.txt", "file2.txt", "--output", "output.txt"]
+    test_args = ["script_name", "--input_files", "file1.txt", "file2.txt", "--output", "combined_contributors.txt"]
     with mock.patch('sys.argv', test_args):
         # Execute
         combine_contributor_files.main()  # Assuming your script has a main function to initiate processing
@@ -19,7 +19,7 @@ def test_process_input_files(mock_exists):
     mock_open = mock.mock_open()
     with mock.patch('builtins.open', mock_open):
         combine_contributor_files.main()
-    mock_open.assert_called_with('output.txt', 'w')
+    mock_open.assert_called_with('combined_contributors.txt', 'w')
     handle = mock_open()
     handle.write.assert_called_with("1\n2\n3\n")