diff --git a/.gitignore b/.gitignore
index cd0c32e9..e127c60a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,9 @@ requests.egg-info/
 *.swp
 *.egg
 env/
+.venv/
+.eggs/
+.tox/
 
 .workon
 
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 59b0b0ef..ba0668f3 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -332,6 +332,7 @@ class TestGuessJSONUTF:
 
     @pytest.mark.parametrize(
         ('encoding', 'expected'), (
+            ('utf-8-sig', 'utf-8'),
             ('utf-16-be', 'utf-16'),
             ('utf-16-le', 'utf-16'),
             ('utf-32-be', 'utf-32'),