Reenable a disabled Provider test

Author: markerikson

test/components/Provider.spec.tsx

@@ -328,7 +328,7 @@ describe('React', () => {
       expect(spy).not.toHaveBeenCalled()
     })
 
-    it.skip('should unsubscribe before unmounting', () => {
+    it('should unsubscribe before unmounting', () => {
       const store = createStore(createExampleTextReducer())
       const subscribe = store.subscribe