automatic: pyupgrade --py36-plus

tests/unit/test_file_checker.py

@@ -1,5 +1,6 @@
 """Unit tests for the FileChecker class."""
-import mock
+from unittest import mock
+
 import pytest
 
 import flake8
@@ -50,7 +51,7 @@ def test_nonexistent_file():
 def test_raises_exception_on_failed_plugin(tmp_path, default_options):
     """Checks that a failing plugin results in PluginExecutionFailed."""
     foobar = tmp_path / 'foobar.py'
-    foobar.write_text(u"I exist!")  # Create temp file
+    foobar.write_text("I exist!")  # Create temp file
     plugin = {
         "name": "failure",
         "plugin_name": "failure",  # Both are necessary