style: activate string normalization

test/test_pure_wheel.py

@@ -7,8 +7,8 @@ from . import utils
 
 pure_python_project = test_projects.TestProject()
 pure_python_project.files[
-    'setup.py'
-] = '''
+    "setup.py"
+] = """
 from setuptools import Extension, setup
 
 setup(
@@ -16,27 +16,27 @@ setup(
     py_modules=['spam'],
     version="0.1.0",
 )
-'''
+"""
 
 pure_python_project.files[
-    'spam.py'
-] = '''
+    "spam.py"
+] = """
 def a_function():
     pass
-'''
+"""
 
 
 def test(tmp_path, capfd):
     # this test checks that if a pure wheel is generated, the build should
     # fail.
-    project_dir = tmp_path / 'project'
+    project_dir = tmp_path / "project"
     pure_python_project.generate(project_dir)
 
     with pytest.raises(subprocess.CalledProcessError):
         actual_wheels = utils.cibuildwheel_run(project_dir)
-        print('produced wheels:', actual_wheels)
+        print("produced wheels:", actual_wheels)
 
     captured = capfd.readouterr()
-    print('out', captured.out)
-    print('err', captured.err)
+    print("out", captured.out)
+    print("err", captured.err)
     assert "Build failed because a pure Python wheel was generated" in captured.err