- Each test file declares a single `[TestClass]` whose name mirrors the subsystem under test (e.g. `BuyAgentTests`, `AliasCommandTests`, `ClilocFilterTests`).
- Per-test fixture setup uses `[TestInitialize]` to create a `PlayerMobile` and assign it to `Engine.Player` before invoking command or agent code.
- Network-layer tests wire up the handler registry first (`IncomingPacketHandlers.Initialize()` / `OutgoingPacketHandlers.Initialize()`) then feed hand-crafted `byte[]` payloads wrapped in `new PacketReader(data, data.Length, ...)` to `handler?.OnReceive(...)`.
- Assertions are written with `Microsoft.VisualStudio.TestTools.UnitTesting.Assert.*` (e.g. `Assert.AreEqual`, `Assert.IsTrue`) rather than a third-party assertion library.