backend: config: Refactor TestParse function

[andoriyaprashant]

Summary

This PR refactors the TestParse function in config_test.go to reduce its length and complexity. The function was previously too long and had the linter disabled using //nolint:funlen

Related Issue

Fixes #3287

Changes

• Split TestParse into smaller, individual test functions.
• Removed the //nolint:funlen comment.
• All tests pass successfully.
• The linter now passes for this file without any issues.

Test

=== RUN   TestParseNoArgsNoEnv
--- PASS: TestParseNoArgsNoEnv (0.00s)
=== RUN   TestParseWithArgs
--- PASS: TestParseWithArgs (0.00s)
=== RUN   TestParseFromEnv
--- PASS: TestParseFromEnv (0.00s)
=== RUN   TestParseBothArgsAndEnv
--- PASS: TestParseBothArgsAndEnv (0.00s)
=== RUN   TestParseOidcSettingsWithoutInCluster
{"level":"error","source":"F:/headlamp/backend/pkg/config/config.go","line":171,"error":"oidc-client-id, oidc-client-secret, oidc-idp-issuer-url, oidc-validator-client-id, \n\t\toidc-validator-idp-issuer-url, flags are only meant to be used in inCluster mode","time":"2025-06-24T04:42:00+05:30","message":"validating config"}
--- PASS: TestParseOidcSettingsWithoutInCluster (0.00s)
=== RUN   TestParseInvalidBaseURL
{"level":"error","source":"F:/headlamp/backend/pkg/config/config.go","line":171,"error":"base-url needs to start with a '/' or be empty","time":"2025-06-24T04:42:00+05:30","message":"validating config"}
--- PASS: TestParseInvalidBaseURL (0.00s)
=== RUN   TestParseKubeconfigFromDefaultEnv
--- PASS: TestParseKubeconfigFromDefaultEnv (0.00s)
=== RUN   TestParseEnableDynamicClusters
--- PASS: TestParseEnableDynamicClusters (0.00s)
PASS
ok      github.com/kubernetes-sigs/headlamp/backend/pkg/config

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[skoeva]

Thanks for looking into this issue! We can avoid duplicating code by using table-driven tests, I think it's more idiomatic in situations like this

[skoeva]

Good work, would just suggest a couple of things before approval:

• Squash all your changes (and rebases) into one atomic commit
• Adjust the PR title and commit title to the following format: backend: config: Refactor TestParse function

[skoeva]

Would you be able to squash your changes into an atomic commit? In the same format as before (backend: config: Refactor TestParse function)

[andoriyaprashant]

Hello @skoeva I was facing some local issues with this config branch, so I have opened a new pull request with the same changes as suggested. I am closing this PR now. Kindly review Pull request #3610
Thank you

[skoeva]

what issues were you having? it isn't advisable to reopen PRs because of e.g. rebase issues, is this the case? git rebase -i should be good to wrap up the changes on this branch