Testing an apiserver as part of development

[maleck13]

This is a great resource and very useful, thanks for putting it together. Something that is not clear to me however is what is a good approach to testing the external api of the apiserver (integration, blackbox). Is there a good example of this? When developing a non kubernetes api server, I would normally use the httptest package, start the server with a mocked implementation of the storage layer and the use the http.Client to make a request against the exposed API. Is something similar available and if so are there examples of how to do this?

[deads2k]

Take a look at how I wired together the integration tests for the CRD server here: https://github.com/kubernetes/apiextensions-apiserver/blob/master/test/integration/basic_test.go#L45 . Basically it stands up an insecure server for a local integration test of just that server.

It does seem like this would be an ideal location to demonstrate that concept. @maleck13 do you feel up to opening a pull into k8s.io/kubernetes that adds an integration test like that to show people how they can test?

[maleck13]

@deads2k sure I will take a look at doing that.

I have added something similar here https://github.com/openshift/open-service-broker-sdk/pull/29/files

I will base the PR for this repo from that work

[maleck13]

@deads2k Looking for some guidance. Fairly new to Kubernetes apiservers. In this repo the clientsets are not generated yet, should the generated clientsets be part of the sample-apiserver? In your example, which I used as a base for creating the referenced PR against the open-service-broker-sdk, it makes use of the clientsets, so it seems these would need to be generated before the test could be executed.

[p0lyn0mial]

correct, the sample-apiserver lacks the clientsets. In fact I am going to need them in my upcoming PR. It would be really nice if you could add them :) Here you should find some info:

https://github.com/kubernetes/community/blob/master/contributors/devel/generating-clientset.md

https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/sample-apiserver/hack/update-codegen.sh

[maleck13]

@p0lyn0mial ok thanks, I had looked at those, having trouble with the update-codegen as it seems to want to be run from the root of kubernetes. Hoping to give this some time tomorrow.

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[nikhita]

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