Fix svg mock

Author: renatho

tests/__mocks__/svg.js

@@ -1,2 +1,8 @@
-export default 'SvgrURL';
-export const ReactComponent = 'div';
+import React from 'react';
+
+const SvgrMock = React.forwardRef( ( props, ref ) => (
+	<span ref={ ref } { ...props } />
+) );
+
+export const ReactComponent = SvgrMock;
+export default SvgrMock;