test(): Add comprehensive unit tests for internal/secrets.go file

[GitNinja36]

Description

This PR adds a complete and production-grade unit test suite for the GetSecrets and GetSecretName functions in pkg/internal/secrets.goof the KubeSlice CLI. These functions are responsible for fetching Kubernetes secrets and rely on shell command pipelines that involve tools like kubectl, grep, and awk.

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Testing Approach

Files Covered

• pkg/internal/secrets.go

Functions Tested

• GetSecretName(workerName, namespace, controllerCluster)
• GetSecrets(workerName, namespace, controllerCluster, outputFormat)

Techniques Used

• Fake Binary Injection: Simulated kubectl behavior using temporary fake binaries with controlled outputs.
• Command Pipeline Validation: End-to-end test coverage for kubectl | grep | awk execution to ensure proper parsing and behavior.
• Dependency Isolation: Avoided reliance on global environment or real cluster interaction.
• Sleep Logic Verification: Ensured that the 200ms delay inside GetSecrets executes without being skipped or altered.

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Coverage Results

File	Before	After
pkg/internal/secrets.go	0%	100%

Sample Coverage Output

go test ./pkg/internal -coverprofile=cover.out
go tool cover -func=cover.out | grep secrets.go
github.com/kubeslice/kubeslice-cli/pkg/internal/secrets.go:13:  GetSecrets     100.0%
github.com/kubeslice/kubeslice-cli/pkg/internal/secrets.go:20:  GetSecretName  100.0%

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How Has This Been Tested?

Test Cases

• Test A: Valid secret found from command output pipeline
• Test B: No matching secret found, returns empty string
• Test C: Simulated kubectl failure returns empty result
• Test D: GetSecrets function runs without panic
• Test E: GetSecrets enforces required 200ms delay

Safe Execution

• Temporary binaries and symlinks are cleaned up after every test
• Zero impact to actual system state or real kubectl
• Tests are fully idempotent and CI-safe

CLI Output

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Does this PR introduce a breaking change?

NA

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Fixes

Fixes: #46

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Reviewers

PTAL
@priyupadhyay @narmidm @Rahul-D78 @gourishkb

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Signed-off-by: Rohit Kumar

[Arpit529Srivastava]

your previous commit doesn't have DOC. Please fix that