Runs like a wisp.

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A lightweight and fast test framework for Luau

Wisp gives you a chainable suite API, fluent assertions, and plain text reports — in a few hundred lines of code with zero dependencies.

local Wisp = require("@wisp")

Wisp.suite("Calculator")
  :action("adds numbers", function()
    Wisp.assume(1 + 1):equalsTo(2)
  end)
  :action("throws on division by zero", function()
    Wisp.assume(function()
      error("divide by zero")
    end):throws()
  end)

Wisp()

Calculator
 ✓ adds numbers
 ✓ throws on division by zero

Suites: 1 passed out of 1 total
Tests:  2 passed out of 2 total

Took:   0.11ms

Features

• Fast — 22 suites with 72 tests, all passing in 0.48ms
• Elegant — Chainable syntax that stands out from traditional frameworks
• Lightweight — Zero dependencies, works anywhere Luau runs, ~170 lines total

Getting Started

• Introduction — what Wisp is and isn't
• Installation — add Wisp to a Rojo project
• Your First Test — a five minute walkthrough
• Assertions — the full catalogue of expectations
• API Reference — every exported function, signature, and error