Reformat with black

https://github.com/python/black

tests/test_apps/cliapp/app.py

@@ -2,4 +2,4 @@ from __future__ import absolute_import, print_function
 
 from flask import Flask
 
-testapp = Flask('testapp')
+testapp = Flask("testapp")

tests/test_apps/cliapp/factory.py

@@ -4,15 +4,15 @@ from flask import Flask
 
 
 def create_app():
-    return Flask('app')
+    return Flask("app")
 
 
 def create_app2(foo, bar):
-    return Flask('_'.join(['app2', foo, bar]))
+    return Flask("_".join(["app2", foo, bar]))
 
 
 def create_app3(foo, script_info):
-    return Flask('_'.join(['app3', foo, script_info.data['test']]))
+    return Flask("_".join(["app3", foo, script_info.data["test"]]))
 
 
 def no_app():

tests/test_apps/cliapp/importerrorapp.py

@@ -4,4 +4,4 @@ from flask import Flask
 
 raise ImportError()
 
-testapp = Flask('testapp')
+testapp = Flask("testapp")

tests/test_apps/cliapp/multiapp.py

@@ -2,5 +2,5 @@ from __future__ import absolute_import, print_function
 
 from flask import Flask
 
-app1 = Flask('app1')
-app2 = Flask('app2')
+app1 = Flask("app1")
+app2 = Flask("app2")