Function setup

packages/react-router/tests/useMatch.test.tsx:21–56

({
    RootComponent,
    history,
  }: {
    RootComponent: RouteComponent
    history?: RouterHistory
  })

describe('useMatch', () => {
  function setup({
    RootComponent,
    history,
  }: {
    RootComponent: RouteComponent
    history?: RouterHistory
  }) {
    const rootRoute = createRootRoute({
      component: RootComponent,
    })
    const indexRoute = createRoute({
      getParentRoute: () => rootRoute,
      path: '/',
      component: () => (
        <>
          <h1>IndexTitle</h1>
          <Link to="/posts">Posts</Link>
        </>
      ),
    })

    history = history || createMemoryHistory({ initialEntries: ['/'] })

    const postsRoute = createRoute({
      getParentRoute: () => rootRoute,
      path: '/posts',
      component: () => <h1>PostsTitle</h1>,
    })

    const router = createRouter({
      routeTree: rootRoute.addChildren([indexRoute, postsRoute]),
      history,
    })

    return render(<RouterProvider router={router} />)
  }

  describe('when match is found', () => {
    test.each([true, false, undefined])(