Add unit tests for picker plugin

[pabhi18]

This PR adds unit tests for picker plugins in the scheduler framework.

• Validates behavior of picker plugins under:
  • Single highest-scoring pod
  • Multiple pods with equal scores
  • Empty input list

Fixes #1097

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @pabhi18. Thanks for your PR.

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[nirrozenbaum]

/ok-to-test

[pabhi18]

/retest

[nirrozenbaum]

nit: use package picker.

[nirrozenbaum]

@pabhi18 this is great, thank you!

I have one minor comment on the structuring - can you update the structure to align with other packages?
(use tests array, each entry with name, input, output, picker, etc.)
see example here:

gateway-api-inference-extension/pkg/epp/scheduling/framework/plugins/filter/filter_test.go

Lines 60 to 67 in e9e4558

	func TestFilter(t *testing.T) {
	tests := []struct {
	name string
	req *types.LLMRequest
	filter framework.Filter
	input []types.Pod
	output []types.Pod
	}{

.

[pabhi18]

Hi @nirrozenbaum, I’ve updated the tests to follow the format you mentioned and also renamed the package to picker

[nirrozenbaum]

This is great!

/lgtm
/approve

Congrats @pabhi18 on your first inference gateway PR!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nirrozenbaum, pabhi18

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• OWNERS [nirrozenbaum]

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[pabhi18]

Thank you! @nirrozenbaum