Wait for an element and its text

For my use case I need to wait for a certain element (loaded via AJAX as a template) to appear and inside that element for a certain text to appear (that text is also visible elsewhere on the page). So basically I need something like this to test my application:

```
world.browser.find_by_id('user').is_text_present('Tom', 5)
```

Currently I have the problem that the next steps will be done too quickly.