block7.FAIL

tests/unit/NestedRoute.spec.js
  NestedRoute
    ✕ renders a username from query string (25ms)

  ● NestedRoute › renders a username from query string

    [vue-test-utils]: find did not return .username, cannot call text() on empty Wrapper
``` 

Update `<NestedRoute>`:

```vue
<template>
  <div>
    Nested Route
    <div class="username">
      {{ $route.params.username }}
    </div>
  </div>
</template>