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tests/mock/mod.rs emulates the device's TCP protocol (ping, get_name, get_total_record_count, get_record_bytes), grounded in the reverse engineering notes at https://nicolabelluti.me/posts/2024/05/studying-a-communication-protocol/, so tests/e2e.rs can exercise the real R701 client against it instead of needing a physical reader. Starts with one test (connect + ping); more scenarios (get_name, record streaming, error cases) to follow. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>