diff --git a/test/test_utils.py b/test/test_utils.py
index 462358f5..ffe75240 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -1,27 +1,29 @@
-import pytest
+import json
 from ersilia.utils.terminal import truncate_output
 
+
 def test_truncate_output_list():
     # Test truncation for a long list
     output = list(range(20))  # List with 20 items
     truncated = truncate_output(output, max_items=10)
     assert truncated == "[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] ... (and 10 more items)"
 
+
 def test_truncate_output_dict():
     # Test truncation for a long dictionary
     output = {f"key{i}": i for i in range(20)}  # Dictionary with 20 key-value pairs
     truncated = truncate_output(output, max_items=5)
-    assert truncated.startswith("{\n    \"key0\": 0,")
+    assert truncated.startswith('{\n    "key0": 0,')
     assert truncated.endswith("... (and 15 more lines)")
 
 
-
 def test_truncate_output_short_list():
     # Test for a short list that doesn't need truncation
     output = [1, 2, 3]
     truncated = truncate_output(output, max_items=10)
     assert truncated == "[1, 2, 3]"
 
+
 def test_truncate_output_short_dict():
     # Test for a short dictionary that doesn't need truncation
     output = {"key1": 1, "key2": 2}
@@ -29,12 +31,14 @@ def test_truncate_output_short_dict():
     assert "key1" in truncated
     assert "key2" in truncated
 
+
 def test_truncate_output_short_string():
     # Test for a short string that doesn't need truncation
     output = "Short string"
     truncated = truncate_output(output, max_chars=50)
     assert truncated == "Short string"
 
+
 def test_truncate_output_other_types():
     # Test for non-list, non-dict, non-string types
     output = 12345