How would you test Aggregation Pipeline?

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How to answer this follow-up

Use the parent topic “Aggregation Pipeline” as context. Cover testing approach, production metrics, or scale impact as asked — then refine with AI Mentor below.

Parent context — Aggregation Pipeline

Use Aggregation Pipeline as the core idea. Example shape: Monthly revenue by category: $match date range, $unwind items, $group by category sum price..

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