extend black formatting to tests as well

example-plugin/src/flake8_example_plugin/__init__.py

@@ -3,6 +3,6 @@ from .off_by_default import ExampleTwo
 from .on_by_default import ExampleOne
 
 __all__ = (
-    'ExampleOne',
-    'ExampleTwo',
+    "ExampleOne",
+    "ExampleTwo",
 )

example-plugin/src/flake8_example_plugin/off_by_default.py

@@ -3,8 +3,9 @@
 
 class ExampleTwo:
     """Second Example Plugin."""
-    name = 'off-by-default-example-plugin'
-    version = '1.0.0'
+
+    name = "off-by-default-example-plugin"
+    version = "1.0.0"
 
     off_by_default = True
 
@@ -13,5 +14,9 @@ class ExampleTwo:
 
     def run(self):
         """Do nothing."""
-        yield (1, 0, 'X200 The off-by-default plugin was enabled',
-               'OffByDefaultPlugin')
+        yield (
+            1,
+            0,
+            "X200 The off-by-default plugin was enabled",
+            "OffByDefaultPlugin",
+        )

example-plugin/src/flake8_example_plugin/on_by_default.py

@@ -3,8 +3,9 @@
 
 class ExampleOne:
     """First Example Plugin."""
-    name = 'on-by-default-example-plugin'
-    version = '1.0.0'
+
+    name = "on-by-default-example-plugin"
+    version = "1.0.0"
 
     def __init__(self, tree):
         self.tree = tree