Roblox Testing

When to Load

Load when writing unit/integration tests, mocking Roblox services, setting up CI/CD with Lune, or refactoring code for testability via dependency injection. Hand off to roblox-luau-core for syntax, roblox-luau-types for type design, roblox-luau-patterns for architecture, roblox-security for validation.

Quick Reference

TestEZ (BDD framework)

• Install: [dev-dependencies] TestEZ = "roblox/testez@0.4.1" in wally.toml
• Files: *.spec.luau, co-located with source
• Blocks: describe → it → beforeEach/afterEach
• Assertions: expect(x).to.equal(y), .to.be.near(n, ε), .to.throw()

Dependency Injection

-- BAD: untestable outside Studio
local store = game:GetService("DataStoreService"):GetDataStore("PlayerData")
-- GOOD: inject dependency
local function saveData(player, data, dataStore)
    dataStore:SetAsync("player_" .. player.UserId, data)
end
-- Module init pattern:
function Manager.init(dataStoreService)
    _dss = dataStoreService or game:GetService("DataStoreService")
end

Mocking Essentials

-- MockDataStore: in-memory Get/Set/Update
local M = {}
function M.new() return setmetatable({_data={}}, {__index=M}) end
function M:GetAsync(k) return self._data[k] end
function M:SetAsync(k,v) self._data[k]=v end
function M:GetDataStore() return self end
-- MockRemoteEvent: OnServerEvent + FireServer
-- MockSignal: Connect/Fire with Connected flag

CI/CD with Lune

# aftman.toml
[tools]
lune = "lune-org/lune@0.8.0"

Pipeline: selene src/ → stylua --check src/ → luau-lsp analyze → lune run tests/run.luau

-- tests/run.luau
local TestEZ = require("@testez")
local results = TestEZ.TestBootstrap:run({game:GetService("ReplicatedStorage")}, TestEZ.Reporters.TextReporter)
if results.failureCount > 0 then os.exit(1) end

Testing Priority

1. DataStore save/load round-trips (prevents data loss)
2. Monetization ProcessReceipt (idempotency)
3. Core math (damage, buffs, economy)
4. Server validation (remote exploits)

Pitfalls

• beforeEach to reset state; never game:GetService() in logic
• Tests must be order-independent; CI needs mocks; commit wally.lock

Need more detail? Load references/full.md for the complete reference with code examples, API tables, and edge cases.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: TabooHarmony
• Source: TabooHarmony/roblox-brain
• License: MIT

Install and usage instructions live in the source repository linked above.