MockStorage (src/mock.rs)

In-memory mock storage implementing all storage traits for fast, isolated integration tests in Rust.

// Source: https://github.com/maelstrom-rs/maelstrom | License: Apache-2.0 | Copyright 2020 Chris Bruce
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//! In-memory mock storage for testing.
//!
//! [`MockStorage`] implements every sub-trait in [`crate::traits`] using
//! `Mutex<HashMap<...>>` and `Mutex<Vec<...>>` collections.  It is the only
//! storage backend used by the integration test suite (under `tests/`), which
//! means tests run without a real database and finish in milliseconds.
//!
//! # Design
//!
//! Each logical store is a separate `Mutex`-wrapped collection on the struct.
//! The keys mirror the uniqueness constraints of the real schema (e.g.
//! `(user_id, room_id)` for membership, `(server_name, media_id)` for media).
//! A global `AtomicI64` counter s

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