# `testing.FakeModel.variants`

> Contract 2.0.0 · package sha256 `a857eca95b35921109faf997094bb4192f12527d9d0fcd4be7e97f06425bad6e` · generated from `testing.d.ts` by `services/onsite-scripter/scripts/build-contract-docs.mjs`; edit the source, not this file.

Property of [`testing.FakeModel`](testing.FakeModel.md) · labs, `@experimental` · since 2.0.0

```ts
variants?: readonly string[];
```

The GLB's KHR_materials_variants names, as the runtime reads them from the loaded file,
stamped or not: a [`MaterialSpec.variant`](MaterialSpec.variant.md) this list lacks records 'unsupported-spec' at
'patch.material.variant', as on the runtime. `fakeModelFromGlb` fills it from the file;
[`describe(node).manifest`](ModelDescription.manifest.md) stays as [`manifest`](testing.FakeModel.manifest.md) says (null for an unstamped GLB).

**Default:** manifest.variants, else undefined (any name is taken: not checked)

## Example

Imports: values (`has`, `validate`, the `Holo*Error` classes, the pure helpers) from `@holostep-configurators/runtime-client`, types from `@holostep-configurators/runtime-client/contract`, `/math` and `/testing` names from those entries; `boot` from the runtime module the root's `loadRuntimeAtFloor` resolves to. A type your page defines is your app's: declare it there, never import it from the package.

Compiled under the contract's strict settings (`examples/declaration/24-FakeModel.variants.ts`):

```ts
import { createFakeSession } from '@holostep-configurators/runtime-client/testing';
import type { IModelNode, Session } from '@holostep-configurators/runtime-client/contract';
import type { FakeModel } from '@holostep-configurators/runtime-client/testing';
declare const session: Session;
declare const signal: AbortSignal;
declare const chair: IModelNode;                 // glbUrl 'chair.glb'
const model: FakeModel = { nodes: [{ name: 'Frame', mesh: true }], variants: ['Oak', 'Walnut'] };
export const fake = createFakeSession({ strict: true, models: { 'chair.glb': model }, root: [chair] });
// once the root has loaded (pump `tick` until `idle()` settles, as `createFakeSession` shows):
// 'committed' with one 'unsupported-spec' naming Oak and Walnut, as the runtime does
export const teak = () => fake.node(chair.nodeId).set({ material: { variant: 'Teak' } });
```

## Generic-API test (spec 3.1)

| Rule | Result |
| --- | --- |
| 1. Neutral name | pass: `variants` names no product |
| 2. A precedent | not recorded: no ledger row (coverage.json) names this member or its owner |
| 3. Two apps, or labs | labs (`@experimental` at a stable path, reached through `has()` or `supports()`): it graduates when a second app uses it |
| 4. The cheaper fix first | not recorded per member (Appendix B decides it per need) |