Rudimentary tests for not covered entry points (#11835)

* Add basic snapshot tests to ReactART components (Circle, Rectangle, Wedge)

* More tests on Circle, Rectangle, Wedge

* linc warning fixes

* - remove tests to Wedge component internal function

* More test on Wedge component, update snapshots

packages/react-art/Wedge.js

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow
+ */
+
+'use strict';
+
+const Wedge = require('./npm/Wedge');
+
+module.exports = Wedge;