fix windows failure to remove temp file

examples/flaskr/tests/test_flaskr.py

@@ -17,33 +17,25 @@ from flaskr.blueprints.flaskr import init_db
 
 
 @pytest.fixture
-def app(request):
-
-    db_fd, temp_db_location = tempfile.mkstemp()
+def app():
+    db_fd, db_path = tempfile.mkstemp()
     config = {
-        'DATABASE': temp_db_location,
+        'DATABASE': db_path,
         'TESTING': True,
-        'DB_FD': db_fd
     }
-
     app = create_app(config=config)
 
     with app.app_context():
         init_db()
         yield app
 
+    os.close(db_fd)
+    os.unlink(db_path)
+
 
 @pytest.fixture
-def client(request, app):
-
-    client = app.test_client()
-
-    def teardown():
-        os.close(app.config['DB_FD'])
-        os.unlink(app.config['DATABASE'])
-    request.addfinalizer(teardown)
-
-    return client
+def client(app):
+    return app.test_client()
 
 
 def login(client, username, password):