test: Reduce memory usage by not requiring stores into all (#2265)

app/test/setup.js

@@ -3,7 +3,6 @@
 import localStorage from '../../__mocks__/localStorage';
 import Enzyme from "enzyme";
 import Adapter from "enzyme-adapter-react-16";
-import "../stores";
 
 Enzyme.configure({ adapter: new Adapter() });
 

app/test/support.js

@@ -1,2 +1,2 @@
 // @flow
-export const runAllPromises = () => new Promise(setImmediate);
+export const runAllPromises = () => new Promise<void>(setImmediate);