chore: adds example code and README for setting up testing with a payload project

[JarrodMFlesch]

Description

This adds a new testing folder inside the examples directory. The purpose is to show users how to get up and running with testing within their own payload projects.

• I have read and understand the CONTRIBUTING.md document in this repository.

Type of change

• Change to the examples directory (does not affect core functionality)

[JarrodMFlesch]

Is anyone opposed to this change? It behaves the same as before, I just wanted to ask as I cannot see why we would need wildcards before the src and test entry points.

[jacobsfletch]

@JarrodMFlesch is this PR still valid? I see the testing example did make its way into main. Do we need to close this one out?

[JarrodMFlesch]

@jacobsfletch I am going to merge this one into the 1.x branch. I see I need to adjust the testing example on 2.0 as well now too.

[jackadair]

Hey @JarrodMFlesch is the current example on 2.0? Just trying to figure out how to pass a different db url for testing but am getting the type error:
Object literal may only specify known properties, and 'mongoURL' does not exist in type 'InitOptions'.

Thanks!

[JarrodMFlesch]

@jackadair no it is not, good call! I can get this updated today though

[jackadair]

@JarrodMFlesch That would be amazing, thank you 🙏

[jackadair]

@JarrodMFlesch Hey sorry to bother but any update on this?

[JarrodMFlesch]

Hey @jackadair, thanks for pinging me. Just updated it! Check out this PR to see what needs to be changed when working with Payload 2.x #4431