Use CachedSession (and no expiry) means that changes to the API are not picked up

[willu47]

The library uses CachedSession from requests_cache.

This means that changes to the API can cause the tests which use the API to pass, even when the API changes.

Solution

• Do not use CachedSession for tests
• Use CachedSession, but only with a short expire_after=1 argument, or always_revalidate=True argument.