Installation

npm install -g vybtest

Quick Start

Create player.ts.vyb:

"player starts with full health":
  confidence: 0.95
  when:
    - "player = createPlayer(100, 100)"
  then:
    - "expect: player.health == 100"

Run:

vyb run tests/

Output:

tests:
  - name: player starts with full health
    status: fail
    actual: 50
    expected: 100
    hints:
      - The equality check failed

Your AI reads the structured output, sees actual: 50 vs expected: 100, and fixes the code.

Why Vyb

Traditional test output is designed for humans. Stack traces, diff formatting, ANSI colors. Your AI has to guess what went wrong.

Vyb outputs structured YAML with:

• Actual and expected values
• Failure location
• Pattern-matched hints
• Confidence guidance

Zero API calls. Zero cost. Just tests that tell AI exactly what failed.

Documentation

Full documentation at vybtest.com

License

MIT