msw: Avoid multiple setupWorker() calls

Author: Turbo87

tests/helpers/setup-msw.js

@@ -6,17 +6,17 @@ import { setupWorker } from 'msw/browser';
 
 import { setupFakeTimers } from './fake-timers';
 
+const worker = setupWorker(
+  ...handlers,
+  http.get('/assets/*', passthrough),
+  http.all(/.*\/percy\/.*/, passthrough),
+  http.get('https://:avatars.githubusercontent.com/u/:id', passthrough),
+);
+
 export default function (hooks) {
   setupWindowMock(hooks);
   setupFakeTimers(hooks, '2017-11-20T12:00:00');
 
-  let worker = setupWorker(
-    ...handlers,
-    http.get('/assets/*', passthrough),
-    http.all(/.*\/percy\/.*/, passthrough),
-    http.get('https://:avatars.githubusercontent.com/u/:id', passthrough),
-  );
-
   hooks.before(() => worker.start({ quiet: true, onUnhandledRequest: 'error' }));
   hooks.afterEach(() => worker.resetHandlers());
   hooks.afterEach(() => db.reset());