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tach-core

Hypervisor-accelerated Python test runner in Rust.

Build & Test

# Build (uses mold + sccache automatically)
cargo build

# Tests - use nextest, not cargo test
cargo nextest run --lib        # Unit tests only (fast)
cargo nextest run              # All tests
cargo nextest run -E 'test(async)'  # Filter by name

# Linting
cargo fmt && cargo clippy -- -D warnings

Speed Stack

Tool Purpose
mold 10x faster linker
sccache Compilation caching
nextest Parallel test execution

Config lives in .cargo/config.toml and .config/nextest.toml.

Project Structure

  • src/ - Rust core (discovery, execution, hooks, protocol)
  • src/tach_harness.py - Python test harness
  • tests/ - Python gauntlet tests
  • rust_tests/ - Rust integration tests

Roadmap

See docs/research/roadmap.md for implementation phases.