Roblox Validation And QA

Roblox Validation And Qa

Overview

Every claim about a change must name the rung of the evidence ladder it actually reached, backed by output produced in the current session. "Code done" and "verified" are different states — the board's Testing lane exists precisely for the gap between them. This skill applies to any project on the house stack (Rojo + Wally + Jest Lua via DevPackages + the roblox-testing plugin + UI Labs).

When to use / When NOT to use

Use this skill when:

• You are about to claim a change works, passes, or is done.
• You are writing or running unit tests, playtest scenarios, or UI stories.
• You need to know which shipped features are actually playtested vs merely code-complete.

Do NOT use this skill for:

• What is allowed to change and who signs off → roblox-change-control (it owns the four hard rules; note rule 2: never run rblxsync run against the live universe to "verify" a product exists).
• Diagnosing why something is broken → roblox-debugging-playbook (triage) and superpowers:systematic-debugging.
• Measurement/profiling tools → roblox-diagnostics-and-tooling.
• Build/bootstrap problems (wally, sourcemap, rojo serve) → roblox-build-and-env (it owns the canonical bootstrap; only test-specific traps are restated here).
• Deep playtest-scenario file format → plugin skill roblox-testing:writing-playtest-scenarios.
• Deep UI Labs story format/controls → plugin skill install-ui-labs:writing-ui-labs-stories.
• What "good evidence for a tuning change" means economically → roblox-proof-and-analysis-toolkit and hard rule 4 in roblox-change-control.

The evidence ladder

Weakest to strongest. Every completed change should state its rung explicitly (in the plan file note and the board card text).

Manual rung-1 command (mirrors the hook; run from the project repo root, needs sourcemap.json + globalTypes.d.luau present — see roblox-build-and-env):

luau-lsp analyze --defs=globalTypes.d.luau --sourcemap=sourcemap.json \
  --no-strict-dm-types --ignore="Packages/**" \
  --ignore="*.spec.lua" --ignore="*.spec.luau" <file-or-dir>

Rules that make the ladder honest (the project's CLAUDE.md honesty rules own the general form — this is the QA application):

• Never claim PASS without run output from this session. A green run last week is a historical fact, not current evidence.
• A rung only counts if the run exercised the change. A passing smoke test does not verify a purchase flow.
• Rungs 1–2 catch syntax/type/style problems only. They say nothing about behavior.
• UI Labs storybooks are NOT a rung. They are a visual review aid with no assertions.
• If you cannot reach the rung a change needs (usually 5 or 6), say so, leave the plan box unchecked, and put/keep the card in the board's Testing lane. Board convention (docs/BOARD.html): "Testing = code done, needs a Studio playtest or rblxsync run to verify."

Unit tests: Jest Lua

House-stack wiring (verified against the reference repo 2026-07-05; re-verify in your project with the commands in Provenance):

Adding a spec — checklist

Use an existing spec in the project as the template (find one: find src -name "*.spec.luau"). The canonical shape:

local ReplicatedStorage = game:GetService("ReplicatedStorage")

local JestGlobals = require(ReplicatedStorage.DevPackages.JestGlobals)
local describe = JestGlobals.describe
local it = JestGlobals.it
local expect = JestGlobals.expect

local Smoothstep = require(script.Parent.Parent.Smoothstep)

describe("Smoothstep", function()
	it("returns 0 at t = 0", function()
		expect(Smoothstep(0)).toBe(0)
	end)
end)

• Create __tests__/<Module>.spec.luau next to the module; require the module via script.Parent.Parent.<Module>.
• Ensure DevPackages exists: npm run build:deps (runs wally install + sourcemap). If DevPackages was freshly installed, also run the types pass that NO npm script covers: wally-package-types --sourcemap sourcemap.json DevPackages — build:sourcemap only runs wally-package-types on Packages, so DevPackages linker stubs stay untyped without this (verified in the reference repo's package.json; check yours the same way).
• Regenerate the sourcemap after creating the file: npm run build:sourcemap. The luau-lsp hook analyzes against a static sourcemap.json; a new file that isn't in it makes the hook fail on valid code (see roblox-build-and-env).
• Note the hook itself skips *.spec.luau (its --ignore flags) — your spec is not type-checked by the hook; keep it strict-clean anyway (.luaurc sets strict mode repo-wide).
• Run the suite (next section) and paste the pass/fail line into the plan file.

Picking spec targets — the triage pattern

Sort candidate modules into three buckets before writing anything:

1. Pure/deterministic — test today, zero mocks. Data-in/data-out functions: math (XP/level curves, interpolation), seeded RNG streams, placement/geometry computed from plain inputs, threshold-to-text mappings. Highest value: pure modules whose regressions corrupt player-facing state silently (progression math, deterministic generation where same-seed-same-stream is a load-bearing invariant).
2. Needs mocks — lower priority, do NOT unit-test naively. Anything that calls a yielding web API or connects player signals at module load. Learned in a shipped firebit game, 2026: a shared price-adjustment module called MarketplaceService:GetUsersPriceLevelsAsync (a yielding web call) and connected Players.PlayerRemoving at module load — a naive spec yields on a web call inside the test run. Defer these until a mocking approach exists in the project.
3. Services — integration-shaped, not Jest targets. *Service.luau files hit DataStores/Replica/players; verify them via scenarios (rung 4) or playtests (rung 5), not Jest, until a service-harness pattern exists.

Measure your project's coverage gap directly (see Provenance) rather than assuming — on the house stack, expect services to be untested by Jest by design.

Running unit tests: /roblox-testing:test

Prerequisites: Roblox Studio open with a place connected to rojo serve (no project argument = serves default.project.json — the only tree that mounts DevPackages and specs), and the Studio MCP server reachable. Then run the slash command /roblox-testing:test. It starts play mode, executes the RunTests require, polls console output for the completion line, stops play, and reports the Tests: X failed, Y passed, Z total summary.

Hard rules:

• Never report PASS on 0 tests. If testMatch matched nothing (wrong filename, spec not synced, sourcemap stale), a run with zero tests is a failure of the run, not a pass.
• If /test or /playtest has never completed end-to-end in the current project, say so before relying on it — a statically-verified pipeline is not a proven one. Record the first successful end-to-end run in the relevant plan file.

Playtest scenarios (rung 4)

Scenarios live in tests/scenarios/*.md and are executed by /roblox-testing:playtest <name>. Every project should carry at least a smoke.md (spawn, HUD visible, basic movement/inputs, no console errors) — use it as the format example:

• YAML frontmatter: name, optional timeout (seconds, default per-step timeout), optional place.
• Optional ## Setup Luau block for determinism (seed currency, teleport, force a game phase).
• ## Steps: numbered natural language; append (continue-on-fail) to non-critical steps.
• ## Expect: one assertion per line with a prefix — capture: (screenshot judgment), state: (instance-tree fact, e.g. LocalPlayer.Character exists with Humanoid.Health > 0), console: (log expectation, e.g. no script errors).

Deep format rules, naming, and setup-block idioms are owned by roblox-testing:writing-playtest-scenarios — read it before writing a new scenario.

Scenario-first bug workflow: when a reproducible bug is reported, write the scenario FIRST, confirm it fails, fix the code, confirm it passes, and keep the scenario as a permanent regression test. tests/scenarios/ is not in any Rojo tree, so scenarios cost nothing in the shipped game.

Storybooks (UI Labs)

Format is UI Labs, NOT Flipbook. House conventions:

• Storybook root: src/Client/Test/init.storybook.luau → { name = "firebit", storyRoots = { script.Parent:WaitForChild("Storybooks") } }.
• Stories live in src/Client/Test/Storybooks/*.story.luau.
• Story shape: module returns { react = React, reactRoblox = ReactRoblox, summary, controls, story = function(props) ... end } with type Props = { controls: typeof(controls) }. Use an existing *.story.luau in the project as the template. (Flipbook's storybook-level packages table is gone — do not reintroduce it.)
• Scope: leaf presentational components only. Overlays/portals are not storyable — learned in a shipped firebit game, 2026: the root overlay transitively required Workspace contents at module load, which the storybook environment does not have.
• Run inside Studio via the UI Labs plugin; there is no CLI runner.

Deep format detail is owned by install-ui-labs:writing-ui-labs-stories. Remember: a story is a review aid, not evidence — it never moves a change up the ladder.

Certified inventory — the pattern

Every project maintains a certified inventory: a table of shipped/in-flight features vs the evidence rung each has actually reached, with the gate still to clear. The board's Testing lane (docs/BOARD.html) holds the "code done, NOT playtested" rows; the Done lane implies rung 5+ was reached. Format:

Rules for maintaining it:

• Build the Testing-lane view from the board, not from memory: read docs/BOARD.html and the matching docs/plans/*.md files.
• For monetization rows, product/pass/badge ground truth is the checked-in src/Shared/Data/Monetization/Generated.luau and rblxsync-lock.yml — read the working tree, not git HEAD (pending changes may be uncommitted). Numeric IDs and flag values are project state: see roblox-config-and-flags for how each project catalogs them.
• Features gated on rung 5/6 are human-gated: the only agent-executable work is building rung-3/4 evidence underneath them.
• Board lanes and plan checkboxes can drift apart (learned in a shipped firebit game, 2026: several Done-lane features still had unchecked plan boxes). Treat disagreement as a bug; the fresher artifact wins while you fix the stale one — doc-debt handling is owned by roblox-docs-and-writing.

Common mistakes

• Claiming PASS from memory or from a previous session's run. Evidence expires when the code changes; runs must come from this session.
• Reporting /test success when zero tests ran.
• Treating "types clean + selene clean" as verification of behavior. Rungs 1–2 gate merges, they don't verify features.
• Marking a Testing-lane card done, or checking a plan's playtest box, on the strength of static code reading.
• Running rblxsync run to "verify" product IDs — forbidden (hard rule 2, roblox-change-control). Read src/Shared/Data/Monetization/Generated.luau and rblxsync-lock.yml instead; both are checked-in ground truth — and read the working tree, not git HEAD, since recent monetization edits may be uncommitted.
• Requiring RunTests, DevPackages, or anything under __tests__/ from runtime code — production builds strip all of it (globIgnorePaths), so the built place will error.
• Creating a spec and skipping npm run build:sourcemap — the luau-lsp hook then fails on the next edit.
• Forgetting the manual wally-package-types --sourcemap sourcemap.json DevPackages pass after a fresh wally install.
• Writing stories for overlays/portals, or citing a storybook as test evidence.
• Unit-testing a module that yields on a web API (e.g. a MarketplaceService call) without mocking it — the spec will yield mid-run.

Provenance and maintenance

Derived 2026-07-05 from the firebit house-stack reference project, by direct reads of its working tree. All commands and paths are house conventions; re-verify them against the CURRENT project before relying on them:

# Jest wiring + spec count
grep -n -A3 "dev-dependencies" wally.toml
grep -n "testMatch" src/Shared/jest.config.luau
find src -name "*.spec.luau"

# Production exclusion + DevPackages mount (adjust per-place project names)
grep -n "globIgnorePaths" *.project.json
grep -n "DevPackages" default.project.json

# Coverage gap
find src/Server -name "*Service.luau" | wc -l
ls src/Shared/Modules | grep -c ".luau$"

# Scenarios + storybooks
ls tests/scenarios/
ls src/Client/Test/Storybooks/ | wc -l

# Certified-inventory inputs: board Testing lane + monetization ground truth
sed -n '/data-status="testing"/,/data-status="up-next"/p' docs/BOARD.html
grep -n "Name = " src/Shared/Data/Monetization/Generated.luau