import { describe, it, expect, vi, afterEach } from 'vitest';
import fs from 'fs';
import path from 'path';
import {
NodeFileSystem,
setDefaultFileSystem,
getDefaultFileSystem
} from '../../../packages/shared/src/interfaces/filesystem.js';
describe('NodeFileSystem', () => {
afterEach(() => {
vi.restoreAllMocks();
});
it('delegates existsSync and readFileSync to node fs', () => {
const nodeFs = new NodeFileSystem();
const fixture = path.resolve(process.cwd(), 'package.json');
expect(nodeFs.existsSync(fixture)).toBe(true);
const content = nodeFs.readFileSync(fixture, 'utf8');
expect(content).toContain('"name"');
});
it('returns safe defaults when fs throws', () => {
const nodeFs = new NodeFileSystem();
(nodeFs as unknown as { fs: typeof fs }).fs = {
existsSync: vi.fn(() => {
throw new Error('fail');
}),
readFileSync: vi.fn(() => {
throw new Error('fail');
})
} as unknown as typeof fs;
expect(nodeFs.existsSync('/nope')).toBe(false);
expect(nodeFs.readFileSync('/nope', 'utf8')).toBe('');
});
it('allows overriding the default filesystem instance', () => {
const stub = {
existsSync: vi.fn().mockReturnValue(true),
readFileSync: vi.fn().mockReturnValue('stub')
};
setDefaultFileSystem(stub);
expect(getDefaultFileSystem().existsSync('any')).toBe(true);
expect(getDefaultFileSystem().readFileSync('any', 'utf8')).toBe('stub');
// Reset to real implementation to avoid cross-test pollution
setDefaultFileSystem(new NodeFileSystem());
});
});
