Tests for playground are using a mock response

[michael-kerscher]

The official playground quite often provides a timeout error as in #2549

This is mocking/overriding the response from the playground for success and failure messages to avoid the server provided timeouts. As far as I see most responses from the playground are delivered below 10 seconds (but varies a lot...)

There still might be timeouts and I know of the following knobs that can be tuned

• wdio waits for 10 seconds until it aborts the current attemp (e.g. to wait for the text to be as expected)
  

  comprehensive-rust/tests/wdio.conf.ts

  Line 98 in 347de61

  waitforTimeout: 10000,

• another timeout is the 15 second timeout for fetching the result from the playground - this is not overriden by the mock (currently, pending [🐛 Bug]: mock.respond with fetchResponse set to false still fetches the response from the server webdriverio/webdriverio#14090 which would allow for an immediate mock response without waiting for the remote endpoint)
  

  comprehensive-rust/theme/book.js

  Line 31 in 347de61

  function fetch_with_timeout(url, options, timeout = 15000) {