test(router-core): fix flakiness of store-updates 'preload then navigate' test

Author: Sheraff

packages/react-router/tests/store-updates-during-navigation.test.tsx

@@ -189,14 +189,15 @@ describe("Store doesn't update *too many* times during navigation", () => {
   test('hover preload, then navigate, w/ async loaders', async () => {
     const { select } = setup({
       beforeLoad: () => Promise.resolve({ foo: 'bar' }),
-      loader: () => Promise.resolve({ hello: 'world' }),
+      loader: () => resolveAfter(100, { hello: 'world' }),
     })
 
     const link = await waitFor(() =>
       screen.getByRole('link', { name: 'Posts' }),
     )
     const before = select.mock.calls.length
     fireEvent.focus(link)
+    await new Promise((resolve) => setTimeout(resolve, 50))
     fireEvent.click(link)
     const title = await waitFor(() =>
       screen.getByRole('heading', { name: /Title$/ }),
@@ -208,6 +209,6 @@ describe("Store doesn't update *too many* times during navigation", () => {
     // This number should be as small as possible to minimize the amount of work
     // that needs to be done during a navigation.
     // Any change that increases this number should be investigated.
-    expect(updates).toBe(15)
+    expect(updates).toBe(14)
   })
 })