Add e2e test cases of managing etcd cluster

[ahrtr]

We need to add e2e test cases to verify the etcd-operator's functionalities of managing etcd clusters:

• create & delete 1 member etcd cluster
• create & delete 3 member etcd cluster
• scale in & out etcd cluster
• sanity test against the etcd cluster
  • read & write k/v
  • member list
  • health check

Kubebuilder automatically generates e2e test using ginkgo, but personally I am not a big fan of ginkgo. It creates some syntax sugars on top of golang standard test, and organize the test in a hierarchical structure. When the test file gets bigger and bigger, it will become more and more unreadable.

So it would be great if we can add the e2e test case just using the golang standard test utilities.

[abdurrehman107]

I can take this up guys.

[ahrtr]

The #17 has been merged. This task isn't blocked anymore.

[abdurrehman107]

Sounds good. I'll get started on this today.

[ahrtr]

Note, essentially, the e2e test automates the manual human test process, ensuring comprehensive coverage and repeatability. For each e2e test cases, we should be able to manually run/reproduce it as well.

[abdurrehman107]

Hey there @ahrtr, I've made a rough scaffold of how the tests are going to look like. It is still in my working branch, I'd really appreciate if you can take a look and give feedback. Here's the link to the fork

The current pushed code is able to:

1. build a Kind cluster,
2. deploy the controller to the cluster,
3. deploy the etcd cluster crd and resource to the cluster,
4. scale the etcd cluster from 1 to 3

I am getting started with the sanity testing you mentioned. I'd really appreciate feedback.

[ahrtr]

@abdurrehman107 Please raise a PR to get feedback, thx

[ahrtr]

Also please let's do it step by step.

• Step 1: let's just rewrite the existing e2e test;
• Step 2: add more tests

[abdurrehman107]

Aighty I'll raise a PR. @ahrtr can you elaborate on what you mean by rewriting the existing e2e test? Do you mean that I should rewrite the tests in Ginkgo (by default) to e2e framework?

[ahrtr]

Do you mean that I should rewrite the tests in Ginkgo (by default) to e2e framework?

Basically YES. I see that you add the new e2e test using the e2e framework, so there is no reason to keep the existing e2e test with ginkgo.

Actually we have three options,

• Keep using ginkgo, and add any new e2e test using ginkgo as well. Personally I am not a big fan of ginkgo.
• rewriting the existing e2e test with e2e framework, afterwards, add all new e2e test using e2e framework as well.
• rewriting the existing e2e test with golang standard test lib, and afterwards, add all new e2e test using golang standard test lib as well.

@hakman @justinsb @jmhbnz @jberkus what's your thought? thx