add spec for default redirect

extension/src/panel/pages/_index/NoRoutes.spec.ts

@@ -0,0 +1,18 @@
+import { saveLastUsedRouteId } from '@/execution-routes'
+import { expectRouteToBe, render } from '@/test-utils'
+import { describe, it } from 'vitest'
+import { action, loader, NoRoutes } from './NoRoutes'
+
+describe('No routes', () => {
+  describe('Default redirects', () => {
+    it('redirects to the last used route if one is present', async () => {
+      await saveLastUsedRouteId('test-route')
+
+      await render('/', [{ path: '/', Component: NoRoutes, loader, action }], {
+        inspectRoutes: ['/:activeRouteId'],
+      })
+
+      await expectRouteToBe('/test-route')
+    })
+  })
+})