How would you test Aggregation Pipeline?

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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

Scenario: Monthly revenue by category: $match date range, $unwind items, $group by category sum price. Implementation notes: Index fields in initial $match; $project early to trim fields.

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