latticerb

https://github.com/tylerklose/lattice-ruby

Lattice generates deterministic pairwise/t-way covering arrays from a constrained schema of parameters and values. Use it as a library in test suites (RSpec, Minitest, Rails fixtures) or via the bundled `lattice` CLI. Generation runs in a Rust engine shared with the Python lattice-cli package, so both give identical rows for the same schema and seed.