Agent-firstUnity test runner

Write, run, and
debug tests in Unity.

Stop hand-running tests and shipping bugs you could've caught. Your coding agent writes, runs, and debugs Unity tests — multiplayer included — and you step in only when it counts.

Try free for 30 days Watch the demo

No risk. The first 30 days are on us.

AI agent

Claude Code · Codex

write & edit · with MCPs

▶

Unity

Play Mode

MooseRunner closes the validation loop

write tests · run tests · debug tests ◀ ─ ─ ─

The core loop · agent-first

Write, run, debug.

Three problems — flaky runs, slow loops, blind debugging — one tool. MooseRunner lets your coding agent and you write tests, run them reliably, and see exactly what broke, so bugs get caught before they ship.

Write tests

A toolbox of helpers for authoring tests — scene loading, persistent-object tagging and cleanup, and above all first-class multiplayer harnesses and async (UniTask · Task · coroutine) support.

See how

Run tests

Stable, predictable state managed Play Mode execution — any order, any speed, even parallel multiplayer instances synced to one clock.

See how

Debug tests

Analyze every run: rerun in any order, a unified multiplayer log, and an AI visual-analysis pass that gives the agent eyes.

See how

PlayMode Test Runner — Unity Editor

The real MooseRunner Unity inspector panel

The panel

The human side.

Everything on the left ships today — a docked inspector a human drives by hand, and a CLI the agent drives. Two surfaces, same result.

Run · Stop · "Run the selected state."

One click runs the selected Play Mode tests — or your agent triggers them and reads the result back.

Interactive Time Control: 1.0

Drag the time scale live, set a per-method time scale, or single-step fixed updates one frame at a time.

Select Method / Class ▸ Root

Run a group of tests, control-click individual methods, and run the exact subset you need — again and again, without leaving Play Mode. (Supports Hot Reload.)

☑ Rerun Selected Test On HotReload

Save your code and the selected test re-fires instantly. The tightest possible edit-run loop.

Mean · Max · Duration · FixedUpdates

Real timing metrics, captured every run — numbers an AI agent can assert against deterministically.

CLIHot Reload awareUniTask · Task · coroutine

Install · UPM

One paste into manifest.json.

Open Packages/manifest.json in your Unity project and drop this block in. Unity pulls com.valectric.mooserunner from the public registry. First-run prompts for your license key. Then let your agent run mooserunnerCli setup and it will guide you through the setup (prerequisites, guideline docs, samples). On Unity 6.3+ you’ll see a one-time “Missing Signature” notice for scoped-registry packages — that’s expected; click Close.

Unity 6.xUPM scoped registryPublic · free to install

↳ No license key yet? Start the 30-day trial.

Packages/manifest.json

{
  "scopedRegistries": [
    { "name": "Valectric", "url": "https://registry.npmjs.org", "scopes": ["com.valectric"] },
    { "name": "OpenUPM",   "url": "https://package.openupm.com", "scopes": ["com.cysharp"] }
  ],
  "dependencies": {
    "com.valectric.mooserunner": "2.1.36"
  }
}

Write · Agent-first authoring

Tests your agent can actually write.

MooseRunner gives the agent a harness of well-structured helpers — multiplayer rigs, async support, scene setup and cleanup — so it authors real tests fast. You review and steer; the agent does the typing.

Multiplayer test harness

Spin up a master and clones, sync their clocks, and assert across instances — the hardest tests to write by hand, made first-class.

Async, your way

UniTask, standard Tasks and coroutines are all first-class, so generated tests match how your codebase already works.

Scene loading, tags & cleanup

Load any scene by name, tag persistent objects to survive a run, and tear everything down cleanly between tests.

agent ▸ mooserunnerCliCLI

$mooserunnerCli --help

Tests · Diagnostics · Recording · …

$mooserunnerCli test --class Game.Tests PlayerFlowTests

▶ Play Mode · stable · repeatable

✓ 11 passed · 1 failed (1.56s)

$mooserunnerCli test-log

assert Position(8,3) ✗ — got (8,1)

Run · Foundation

Stable, repeatable test execution.

Play Mode tests that just run — no Edit-Mode round-trip, in any order you want. Because nothing else matters if the basics don't work.

Stays in Play Mode

Run test after test without forcing a jump back to Edit Mode between each one.

Any order, grouped

Group tests, control-click to select methods, and run exactly what you need.

Async, your way

UniTask, standard Tasks, and coroutines — however you write async, it's handled.

Hot Reload aware

Understands the Hot Reload plugin and transitions correctly on reload events.

Auto-rerun on save

Save your code and the selected test re-executes instantly. Tightest loop possible.

Clean, repeatable

Results an AI agent can trust — the same run, the same way, every time.

Run · Multiplayer

Test multiplayer like it's single-player.

Parallel Unity instances, synchronized time, and assertions that target specific clones from the master — all reporting into master and one unified log for debugging.

master

⏱ 1.0× synced

◀ collects asserts

clone 1

⏱ 1.0× synced

assert → master

clone 2

⏱ 1.0× synced

assert → master

clone 3

⏱ 1.0× synced

assert → master

Unified Multiplayer Log

[master] run FlowTests

[clone 1] spawned · synced 1.0×

[clone 2] assert Position() → master

[clone 3] assert Health() → master

[master] FixedUpdate stepping…

✓ all clients converged (1.56s)

Debug · Time control

Inspect at any speed.

Slow time to a crawl to catch a blink-and-miss bug. Fast-forward past setup. Or single-step fixed updates one frame at a time.

Interactive Time Control

1.00×

time scale

↳ stays synced across every multiplayer instance.

Debug · AI visual analysis

Give AI eyes.

Some bugs are purely visual — wrong animation, wrong position, movement that just looks off. Record the run, tag objects, and let a second AI describe exactly what it sees.

Recording · 7.1s● REC

Empty platform before the character spawns

0.0s

Character standing upright on the platform

1.6s

Character pitching forward onto the red object

2.4s

Character clipping into the red object, only upper half above the surface

5.6s

Character has disappeared — only the platform and red object remain

6.8s

Tagged object

Player

Start → End

(0,0) → (8,3)

Max velocity

12.4 u/s

Duration

7.10s

agent ▸ what happens 5.6–6.8s?

visual analysis

“The character collapses face-down onto the red object. By 5.6s only the upper torso is visible above its surface — the rest has clipped through. At 6.8s the character is gone entirely; no falling animation, no despawn effect. Likely a collision-volume mismatch.”

*Bring your own key.

More · Beyond the headlines

Depth beyond the headlines.

Test-scene loading

Load any scene by name — even outside build settings.

Human review toggle

AI can design tests with human review in mind. Add delays or stop time when the toggle is on.

Smart cleanup

Gentle or aggressive modes, with persistent-object tagging.

Hot Reload + auto-rerun

Save and the selected test re-fires instantly.

UniTask · Task · coroutine

Every async style is supported out of the box.

Persistent tags

Keep objects across tests without DontDestroyOnLoad.

30 days free

Test MooseRunner for free and start feeling the benefit of a solid validation loop.

Start free

Pricing · per seat

Simple, per-seat pricing.

Launch offer — 50% off. Use code at checkout:AITDD

Indie

Teams under 10 seats and under $200k revenue.

$20/mo · per seat

or $200/yr — 2 months free

Everything in MooseRunner

Write · run · debug, agent-first

Per seat

Annual = 2 months free

Start free

Studio

Teams of 10+ seats, or $200k+ revenue.

$89/mo · per seat

or $890/yr — 2 months free

Everything in Indie

Priority support

Per seat

Annual = 2 months free

Start free

Enterprise

Bespoke licensing, support, and invoicing.

Let's talk

volume seat pricing

Bespoke licensing

Priority support

Custom invoicing

Custom terms

Card required to start the trial. No charge for 30 days; auto-renews on day 31 unless cancelled. Indie requires a checkbox attestation that annual revenue is below $200,000 USD.

FAQ

Questions, answered.

Still stuck? Email support@mooserunner.com — a human replies.

Two reasons: iteration speed and agents. Authoring and iterating on tests in Unity’s built-in Test Runner is slow and fiddly — the edit-run loop drags. And it isn’t agent-native: there’s no clean way for an AI coding agent to run tests and read results back, so driving it from an agent is a constant fight. MooseRunner adds a structured authoring harness and a CLI the agent drives directly — fast for you, native for the agent.

Try free for 30 days.

Write, run, and debug Unity tests with your AI agent. Indie from $20/mo, studio $89/seat — 30 days free.

Get MooseRunner Watch the demo

Write, run, anddebug tests in Unity.

Write, run, debug.

Write tests

Run tests

Debug tests

The human side.

One paste into manifest.json.

Tests your agent can actually write.

Multiplayer test harness

Async, your way

Scene loading, tags & cleanup

Stable, repeatable test execution.

Stays in Play Mode

Any order, grouped

Async, your way

Hot Reload aware

Auto-rerun on save

Clean, repeatable

Test multiplayer like it's single-player.

Inspect at any speed.

Give AI eyes.

Depth beyond the headlines.

Simple, per-seat pricing.

Questions, answered.

Try free for 30 days.

Write, run, and
debug tests in Unity.