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stack/apps/gateway/src/harness/testing/fake-harness.adapter.spec.ts
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2026-08-11 19:22:27 -05:00

108 lines
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TypeScript

import { describe, expect, it } from 'vitest';
import type { HarnessActorContext, HarnessSelection } from '@mosaicstack/types';
import { HarnessOperationError } from '../harness.registry.js';
import { FakeHarnessAdapter } from './fake-harness.adapter.js';
import { runHarnessAdapterContract } from './harness-adapter.contract.js';
const CONTEXT: HarnessActorContext = {
actorId: 'actor-1',
tenantId: 'tenant-1',
seatId: 'seat-1',
correlationId: 'correlation-1',
};
// The reusable conformance suite. Task 13 re-runs it against the native Pi adapter.
runHarnessAdapterContract('FakeHarnessAdapter', () => new FakeHarnessAdapter({ id: 'fake' }));
describe('FakeHarnessAdapter no-substitution', () => {
it('never substitutes the first catalog row when a bogus selection is requested', async () => {
const adapter = new FakeHarnessAdapter({ id: 'fake' });
const catalog = await adapter.catalog(CONTEXT);
const firstRow = catalog.models[0];
if (!firstRow) {
throw new Error('fixture requires a catalog model');
}
const available = catalog.models.find(
(entry) => entry.availability === 'available' && entry.modelId !== firstRow.modelId,
);
expect(available).toBeDefined();
const selected: HarnessSelection = {
harnessId: available!.harnessId,
providerId: available!.providerId,
modelId: available!.modelId,
};
const handle = await adapter.create({
context: CONTEXT,
conversationId: 'conversation-1',
selection: selected,
});
const bogus: HarnessSelection = {
harnessId: 'fake',
providerId: 'ghost-provider',
modelId: 'ghost-model',
};
let error: unknown;
try {
await handle.setModel(bogus);
} catch (caught) {
error = caught;
}
expect(error).toBeInstanceOf(HarnessOperationError);
const dto = (error as HarnessOperationError).dto;
expect(dto.code).toBe('selection_invalid');
// The DTO echoes the exact requested tuple, unchanged.
expect(dto.selection).toEqual(bogus);
// No substitution to the first catalog row.
expect(dto.selection).not.toEqual({
harnessId: firstRow.harnessId,
providerId: firstRow.providerId,
modelId: firstRow.modelId,
});
// The active selection is untouched by the rejected request.
expect((await handle.snapshot()).selection).toEqual(selected);
});
it('reports model_unavailable with the unchanged tuple for a known but unavailable model', async () => {
const adapter = new FakeHarnessAdapter({ id: 'fake' });
const catalog = await adapter.catalog(CONTEXT);
const unavailable = catalog.models.find((entry) => entry.availability === 'unavailable');
const available = catalog.models.find((entry) => entry.availability === 'available');
expect(unavailable).toBeDefined();
expect(available).toBeDefined();
const startingSelection: HarnessSelection = {
harnessId: available!.harnessId,
providerId: available!.providerId,
modelId: available!.modelId,
};
const handle = await adapter.create({
context: CONTEXT,
conversationId: 'conversation-2',
selection: startingSelection,
});
const requested: HarnessSelection = {
harnessId: unavailable!.harnessId,
providerId: unavailable!.providerId,
modelId: unavailable!.modelId,
};
let error: unknown;
try {
await handle.setModel(requested);
} catch (caught) {
error = caught;
}
expect(error).toBeInstanceOf(HarnessOperationError);
const dto = (error as HarnessOperationError).dto;
expect(dto.code).toBe('model_unavailable');
expect(dto.selection).toEqual(requested);
expect((await handle.snapshot()).selection).toEqual(startingSelection);
});
});