Tenant isolation tests for coding agent changes

Tenant isolation testing verifies that one customer in a shared application cannot access, modify, or affect another customer’s data, including through overlooked paths such as background jobs, caches, search indexes, queues, and object storage. Effective testing traces the tenant identifier from authenticated identity through every data-access layer, ensuring client-provided tenant IDs are not treated as authority and that all queries, events, cache keys, and file paths remain tenant-scoped. Teams should use deliberately similar fixtures for at least two tenants, test both standard and privileged roles against documented policies, and alter individual boundaries such as URLs, tokens, payloads, and storage prefixes to confirm denied requests reveal no cross-tenant information. Coding agents should receive explicit, executable security requirements defining tenant authority, protected resources, roles, expected denial behavior, and targeted tests, while using synthetic rather than production data. Reviews should examine final resource lookups instead of middleware alone, collect sanitized evidence of authorization decisions, run concurrent tests where shared workers or caches are involved, and confirm that every shared subsystem has both permitted and denied access cases.

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