What is covertable?

covertable is a powerful tool for generating pairwise combinations of input factors, designed for both Node.js and browser environments. It's easy to use, flexible, and supports advanced filtering options, making it perfect for testing scenarios and generating comprehensive datasets.

Simple usage

import { make } from "covertable";
const machine = ["iPhone", "Pixel", "XPERIA", "ZenFone", "Galaxy"];
const os = ["iOS", "Android"];
const browser = ["FireFox", "Chrome", "Safari"];
make([machine, os, browser]);

[
  [ 'Pixel', 'iOS', 'Chrome' ],
  [ 'ZenFone', 'iOS', 'FireFox' ],
  [ 'Pixel', 'Android', 'Safari' ],
  [ 'Galaxy', 'Android', 'Chrome' ],
  [ 'XPERIA', 'Android', 'FireFox' ],
  [ 'Pixel', 'iOS', 'FireFox' ],
  [ 'iPhone', 'iOS', 'Safari' ],
  [ 'Galaxy', 'iOS', 'Safari' ],
  [ 'XPERIA', 'iOS', 'Chrome' ],
  [ 'ZenFone', 'Android', 'Chrome' ],
  [ 'Galaxy', 'iOS', 'FireFox' ],
  [ 'iPhone', 'Android', 'Chrome' ],
  [ 'iPhone', 'iOS', 'FireFox' ],
  [ 'ZenFone', 'iOS', 'Safari' ],
  [ 'XPERIA', 'iOS', 'Safari' ]
]

PICT models & formula columns

covertable reads Microsoft PICT model files directly. A parameter line whose value starts with = is a formula (computed) column: it is emitted on every generated row, with each [Field] reference rewritten to that row's spreadsheet cell — handy for feeding each test case into a spreadsheet (e.g. GridSheet's =CLAUDE(...) / =CODEX(...) AI functions).

Size:     10, 100, 1000
Cluster:  512, 4096
Expected: =CLAUDE("is the total size >= 10KB?", [Size], [Cluster])

Command line

npx covertable pict model.pict -o out.pict.tsv          # TSV (default); .csv → CSV
npx covertable pict model.pict --strength 3 --optimize  # 3-wise, then SA-shrink
covertable pict --help                                  # all options

The CLI fills formula columns per row and drops a trailing ;, so the output is ready to open in a spreadsheet.

Advanced usage

Advanced usage is here