diff --git a/cibuildwheel/__main__.py b/cibuildwheel/__main__.py
index ffb0b684..ab1aa654 100644
--- a/cibuildwheel/__main__.py
+++ b/cibuildwheel/__main__.py
@@ -202,7 +202,6 @@ def main():
         before_test=before_test,
         dependency_constraints=dependency_constraints,
         manylinux_images=manylinux_images
-        
     )
 
     # Python is buffering by default when running on the CI platforms, giving problems interleaving subprocess call output with unflushed calls to 'print'
diff --git a/cibuildwheel/macos.py b/cibuildwheel/macos.py
index d0d264c6..798cb493 100644
--- a/cibuildwheel/macos.py
+++ b/cibuildwheel/macos.py
@@ -181,7 +181,7 @@ def build(options: BuildOptions):
             dependency_constraint_flags = [
                 '-c', options.dependency_constraints.get_for_python_version(config.version)
             ]
-        
+
         env = setup_python(config, dependency_constraint_flags, options.environment)
 
         # run the before_build command
diff --git a/cibuildwheel/util.py b/cibuildwheel/util.py
index 6187986d..03fe6af5 100644
--- a/cibuildwheel/util.py
+++ b/cibuildwheel/util.py
@@ -1,5 +1,4 @@
 import os
-import sys
 import urllib.request
 from fnmatch import fnmatch
 from time import sleep
diff --git a/unit_test/main_tests/main_options_test.py b/unit_test/main_tests/main_options_test.py
index 9439daf6..74cbe3c1 100644
--- a/unit_test/main_tests/main_options_test.py
+++ b/unit_test/main_tests/main_options_test.py
@@ -164,7 +164,7 @@ def test_test_extras(test_extras, platform_specific, platform, intercepted_build
 
     main()
 
-    assert intercepted_build_args.args[0],test_extras == ('[' + test_extras + ']' if test_extras else '')
+    assert intercepted_build_args.args[0].test_extras == ('[' + test_extras + ']' if test_extras else '')
 
 
 @pytest.mark.parametrize('test_command', [None, 'test --command'])