Best setup for using with Jest?

[leepowellnbs]

I'm after some insight into the best way to setup MSW with Jest? Currently we are trialling its usage and only have it in about a dozen tests. However, some of these tests randomly fail when running the entire test suite (they pass individually) - so I'm wondering if we've set it up wrong. I'm thinking it's our MSW setup as it's only these tests that fail.

A few things to note:

• we're using fake timers
• we're using @testing-library/react-native
• we create a new server and handlers per integration test file (should we use one global server and handlers - can they leak into other tests??)
• we are using it with only graphql requests with Apollo client (we create a new client per test and do not cache results)
• Apollo client is configured to use the same uri per test file i.e. http://MOCK_ENDPOINT - guessing this is where some of the problem is?

Any insight would be very helpful into why these tests randomly fail - MSW seems the only common thing between them.