Deterministic Simulation Testing (Tokio/Rust)

What problem does it solve?

This skill eliminates nondeterminism in distributed testing by providing seed-driven deterministic simulations, enabling repeatable test runs across multiple nodes.

Core Features & Use Cases

• Single-threaded execution ensures deterministic async task scheduling.
• Simulated time and network provide full control over timing and I/O in tests.
• Seeded entropy and deterministic RNG guarantee reproducible randomness.
• Fault-injection support (partitions, latency, crashes) enables robust resilience testing.
• Use Case: Verify consensus protocols or client-server interactions under controlled network conditions and seed-based scenarios.

Quick Start

Create DST tests using turmoil or mad-sim by spawning host tasks and simulating network interactions. Run tests with a fixed seed (e.g., TEST_SEED) to reproduce results.