Module testing 

Testing infrastructure: Mock exchanges, paper trading, and simulation utilities.

This module provides reusable components for testing and paper trading:

• QuoteSource: Trait for quote data providers (mock, live, CSV)
• FillSimulator: Shared fill matching logic (price crossing detection)
• MockExchange: Manual quote/fill injection for unit tests
• PaperExchange: Live quotes with simulated fills for paper trading
• MockAccountSyncer, MockTradeSyncer: Mock syncers for testing (native only)

Re-exports

pub use fill_simulator::FillSimulator;

pub use fill_simulator::PendingOrder;

pub use fill_simulator::SimulatedFill;

pub use mock_exchange::MockExchange;

pub use mock_exchange::MockKnobs;

pub use mock_exchange::OrderFailMode;

pub use paper_exchange::create_standalone_paper_exchange;

pub use paper_exchange::create_standalone_paper_exchange_with_id;

pub use paper_exchange::ArcExchange;

pub use paper_exchange::NoOpExchange;

pub use paper_exchange::PaperExchange;

pub use paper_exchange::StandalonePaperExchange;

pub use quote_source::MockQuoteSource;

pub use quote_source::QuoteSource;

pub use mock_syncer::MockAccountSyncer;

pub use mock_syncer::MockTradeSyncer;

Modules

fill_simulator

Fill simulator: Shared logic for simulating order fills.

mock_exchange

Mock Exchange for deterministic testing.

mock_syncer

Mock Syncers for testing backend integration without real API calls.

paper_exchange

Paper Exchange: Simulates order execution using real quotes.

quote_source

Quote source trait: Abstraction for quote data providers.