Add test infra for KRM functions SDK #633
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Description
This PR add methods in
go/fn/testhelperto let function authors to test their code easily.Users should write the input data in a new directory, write the function config in a file named
_fnconfig.yaml, and write the expected output in a file named_expected.yaml. Then use thetesthelperfunctions to read the input, run tests and compare with the expected data.This idea is developed from the Wow demo, borrowed some methods and naming conventions from GoogleContainerTools/kpt-functions-catalog#926 and I rewrote the methods using the latest go SDK methods.
Example
I uploaded an example in this PR, which I plan to provide to function authors as kpt scaffolding package.