diff --git a/tests/test_functional_interface.py b/tests/test_functional_interface.py
index 2f24c40..5b149f3 100644
--- a/tests/test_functional_interface.py
+++ b/tests/test_functional_interface.py
@@ -2,8 +2,8 @@
 
 import pandas as pd
 import pytest
-import starfile
 
+import starfile
 from .constants import loop_simple, postprocess, test_df, test_data_directory
 
 
@@ -29,18 +29,6 @@ def test_write():
     assert output_file.exists()
 
 
-def test_write_overwrites_with_backup():
-    output_file = test_data_directory / 'test_overwrite_backup.star'
-    starfile.write(test_df, output_file)
-    assert output_file.exists()
-
-    starfile.write(test_df, output_file)
-    backup = test_data_directory / 'test_overwrite_backup.star~'
-    assert backup.exists()
-    starfile.write(test_df, output_file)
-    assert backup.exists()
-
-
 def test_read_non_existent_file():
     f = Path('non-existent-file.star')
     assert f.exists() is False
diff --git a/tests/test_writing.py b/tests/test_writing.py
index 8e0ee00..471ccae 100644
--- a/tests/test_writing.py
+++ b/tests/test_writing.py
@@ -11,6 +11,7 @@
 from .constants import loop_simple, postprocess, test_data_directory, test_df
 from .utils import generate_large_star_file, remove_large_star_file
 
+
 def test_write_simple_block():
     s = StarParser(postprocess)
     output_file = test_data_directory / 'basic_block.star'
@@ -72,19 +73,19 @@ def test_can_write_non_zero_indexed_one_row_dataframe():
     assert (expected in output)
 
 
-@pytest.mark.parametrize("quote_character, quote_all_strings, num_quotes", 
+@pytest.mark.parametrize("quote_character, quote_all_strings, num_quotes",
                          [('"', False, 6),
                           ('"', True, 8),
                           ("'", False, 6),
                           ("'", True, 8)
-                         ])
+                          ])
 def test_string_quoting_loop_datablock(quote_character, quote_all_strings, num_quotes, tmp_path):
-    df = pd.DataFrame([[1,"nospace", "String with space", " ", ""]],
-                       columns=["a_number","string_without_space", "string_space", "just_space", "empty_string"])
+    df = pd.DataFrame([[1, "nospace", "String with space", " ", ""]],
+                      columns=["a_number", "string_without_space", "string_space", "just_space", "empty_string"])
 
     filename = tmp_path / "test.star"
     StarWriter(df, filename, quote_character=quote_character, quote_all_strings=quote_all_strings).write()
-    
+
     # Test for the appropriate number of quotes
     with open(filename) as f:
         star_content = f.read()
@@ -93,6 +94,7 @@ def test_string_quoting_loop_datablock(quote_character, quote_all_strings, num_q
     s = StarParser(filename)
     assert df.equals(s.data_blocks[""])
 
+
 def test_writing_speed():
     start = time.time()
     generate_large_star_file()
@@ -102,13 +104,14 @@ def test_writing_speed():
     # Check that execution takes less than a second
     assert end - start < 1
 
-@pytest.mark.parametrize("quote_character, quote_all_strings, num_quotes", 
+
+@pytest.mark.parametrize("quote_character, quote_all_strings, num_quotes",
                          [('"', False, 6),
                           ('"', True, 8),
                           ("'", False, 6),
                           ("'", True, 8)
-                         ])
-def test_string_quoting_simple_datablock(quote_character, quote_all_strings,num_quotes, tmp_path):
+                          ])
+def test_string_quoting_simple_datablock(quote_character, quote_all_strings, num_quotes, tmp_path):
     o = {
         "a_number": 1,
         "string_without_space": "nospace",
@@ -119,7 +122,7 @@ def test_string_quoting_simple_datablock(quote_character, quote_all_strings,num_
 
     filename = tmp_path / "test.star"
     StarWriter(o, filename, quote_character=quote_character, quote_all_strings=quote_all_strings).write()
-    
+
     # Test for the appropriate number of quotes
     with open(filename) as f:
         star_content = f.read()