nessie-backend-conformance

The substrate-agnostic conformance suite every nessie-store backend must pass — and the inside extension point: write a storage backend in Python and validate it against the exact same suites a Rust backend passes.

Install

pip install nessie-backend-conformance      # Python
cargo add nessie-backend-conformance         # Rust (dev-dependency)

Usage (Python) — validate a Python-authored backend

from nessie_backend_conformance import run_all, ConformanceError

class MyBackend:
    def capabilities(self): return {"snapshots": True, "clones": True, "replication": False}
    def create_volume(self, name, size_bytes): ...
    def get_volume(self, uuid): ...        # return None when absent
    # … list_volumes / delete_volume / patch_volume / access_handle
    # … create_snapshot / list_snapshots / get_snapshot / delete_snapshot / create_clone

run_all(MyBackend())   # raises ConformanceError on the first violation

Methods exchange plain domain-shaped dicts ({uuid, name, state, style, vol_type, size_bytes?, clone?} for volumes). A Rust adapter wraps the Python object and runs the suites by calling back into Python under the GIL. See examples/python_backend.py for a complete reference backend.

Usage (Rust)

nessie_backend_conformance::run_all(&my_backend);  // panics on the first violation

Dual-licensed MIT OR Apache-2.0.