Refactor duplicated validation and waitFor parsing logic in test command

[Syedowais312]

Reason/Context

The test command currently contains duplicated logic for:

• argument validation
• --waitFor parsing
• repeated error messages

This makes the command harder to maintain and extend.

Description

I would like to refactor this by extracting reusable helper functions for validation and wait time parsing, while keeping the existing behavior unchanged.

Planned changes:

• extract argument validation into helper function
• extract waitFor parsing into reusable helper
• centralize duplicated error strings into constants
• simplify the command flow and improve readability

Implementation ideas

No response

[github-actions]

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