Add helm-unittest to enchance helm behaviour

[ivankatliarchuk]

What would you like to be added:

Add helm-unittest as github action to test helm chart

Tool https://github.com/helm-unittest/helm-unittest

• blog
• Trafik helm chart with unit test
• HiveMQ platform
• Gitlab runners

I can share more examples

Why is this needed:

• The helm-unittest plugin allows you to write YAML-based unit tests for Helm charts.
• Tests can verify that specific values are set correctly in the rendered templates.

There are quite few helm issues, the helm-unittest could help a bit. As having tests will resolve some regression and we could validate behaviour when different values supplied.

[ivankatliarchuk]

Hi @stevehipwell. My understanding this is your area. What do you think?

[stevehipwell]

Hi @ivankatliarchuk Helm chart unit tests can add value but I think before adding any we'd want to do a cost/benefit analysis.

IMHO the first thing to look at for improving the quality of a chart is the JSON schema, this should catch the majority of the misconfiguration issues. Once a chart has a full schema then anything not covered by that could be considered a target for a unit test.

[ivankatliarchuk]

Ok. Let me know when cost/benefit analysis is conducted. So I open a pr or close this issue))

The Helm JSON schema validates the format and correctness of the values provided to the chart. Helm unit tests go further by verifying the chart's functionality, including the accurate generation of templates based on different sets of values. Sort of different problems.

But yes, having Json Schema will simplify some of the things, and we could have some automated documentation generated as well.

[stevehipwell]

@ivankatliarchuk without a full JSON schema I don't think there is enough benefit to work on this. That said I'm happy for someone to take a real world problem and if it's still an issue after the values are fully covered by a JSON schema, I'd be happy to review unit tests as a solution.