[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

tests/unit/test_base_formatter.py

@@ -141,16 +141,17 @@ def test_write_without_stdout_buffer():
     line = "Something to write"
     source = "source"
 
-    buffer_side_effect = AttributeError("'_io.StringIO' object has no \
-        attribute 'buffer'")
+    buffer_side_effect = AttributeError(
+        "'_io.StringIO' object has no \
+        attribute 'buffer'"
+    )
     buffer_write_mock = mock.Mock(side_effect=buffer_side_effect)
 
     write_mock = mock.Mock()
     mock.patch("flake8.formatting.base.sys.stdout.write", write_mock)
 
     with mock.patch(
-        "flake8.formatting.base.sys.stdout.buffer.write",
-        buffer_write_mock
+        "flake8.formatting.base.sys.stdout.buffer.write", buffer_write_mock
     ):
         formatter = base.BaseFormatter(options())
         formatter.write(line, source)