@systemlabs/foundation-testing

@systemlabs/foundation-testing

Shared test utilities and fixtures for Foundation CLI module and plugin authors.

This package provides helpers for writing unit and integration tests against Foundation modules and plugins. It is a devDependency / peerDependency — it is never included in generated project output.

npm install --save-dev @systemlabs/foundation-testing

What's in this package

Export	Description
makeManifestFixture(overrides?)	Creates a valid ModuleManifest with sensible defaults — override any field
createTempDir()	Creates a unique temporary directory for a test; returns its path and a cleanup() function
makeRegistryFixture(modules?)	Creates a minimal module registry pre-loaded with the provided modules
makeContextFixture(overrides?)	Creates a HookContext suitable for passing into hook tests

Usage

Testing a manifest

import { makeManifestFixture } from '@systemlabs/foundation-testing';
import { validateManifest } from '@systemlabs/foundation-plugin-sdk';
import { describe, it, expect } from 'vitest';

describe('my-plugin manifest', () => {
  it('passes schema validation', () => {
    const manifest = makeManifestFixture({
      id:       'my-plugin',
      name:     'My Plugin',
      category: 'addon',
    });

    const result = validateManifest(manifest);
    expect(result.valid).toBe(true);
  });
});

Testing file output

import { createTempDir } from '@systemlabs/foundation-testing';
import { FileTransaction } from '@systemlabs/foundation-core';
import { readFileSync } from 'node:fs';
import { describe, it, expect, afterEach } from 'vitest';

describe('my-plugin file output', () => {
  const { dir, cleanup } = createTempDir();
  afterEach(cleanup);

  it('writes client.ts to src/my-plugin/', async () => {
    const tx = new FileTransaction(dir);
    tx.stage([{ path: 'src/my-plugin/client.ts', content: 'export {}' }]);
    await tx.commit();

    const content = readFileSync(`${dir}/src/my-plugin/client.ts`, 'utf8');
    expect(content).toBe('export {}');
  });
});

Testing lifecycle hooks

import { makeContextFixture, makeRegistryFixture } from '@systemlabs/foundation-testing';
import myPlugin from '../src/index.js';
import { describe, it, expect } from 'vitest';

describe('my-plugin onFinalize hook', () => {
  it('logs a setup message', async () => {
    const messages: string[] = [];
    const ctx = makeContextFixture({
      logger: { info: (m: string) => messages.push(m) },
      registry: makeRegistryFixture(),
    });

    await myPlugin.hooks?.onFinalize?.(ctx);

    expect(messages.some(m => m.includes('MY_API_KEY'))).toBe(true);
  });
});

Test strategy for Foundation modules

The Foundation CLI test suite uses four layers. When writing tests for your own modules, follow the same pattern:

Unit tests (Vitest) — test the resolver, merger strategies, manifest validation, ORM service, and generator service in isolation.

Integration tests — compose 2–5 modules together, validate the output file structure against expected paths and content.

Snapshot tests — lock in generated file content for known-good module combinations. Run vitest --update-snapshots intentionally when output changes.

Compilation tests — pipe the generated TypeScript/Python through the compiler and assert zero errors.

Requirements

• Node.js ≥ 18
• Vitest ≥ 1.6 (peer dependency)

Part of the Foundation CLI ecosystem

Package	Description
@systemlabs/foundation-cli	User-facing CLI — foundation create, add, generate, etc.
@systemlabs/foundation-core	Engine: dependency resolver, composition planner, file transaction
@systemlabs/foundation-modules	All built-in modules (frontend, backend, database, auth, …)
@systemlabs/foundation-plugin-sdk	Plugin contract, types, manifest schema
@systemlabs/foundation-testing	← you are here — test utilities

License

MIT — see LICENSE