Function expectLocalStorageItemContains

expectLocalStorageItemContains(
    page: any,
    keyKey: string,
    valueKey: string,
): Promise<void>
Asserts that a local storage item exists and contains the expected substring. Supports fixtures for reusable storage keys and values.
Parameters
- page: any
- keyKey: string
- valueKey: string
Returns Promise<void>
Example
```
Then I pw see local storage item "user_prefs" contains "theme"
```
- Defined in backend/assertions/storage.ts:128