Memory Bank MCP Server

import {
  SCHEMA_VERSIONS,
  LATEST_SCHEMA_VERSION,
  SchemaVersion,
  isKnownSchemaVersion,
  migrateDocumentToLatest,
} from '../../src/versioning.js'; // Adjust path as needed
import { vi } from 'vitest'; // jest -> vi

// Mock console.warn for migrateDocumentToLatest tests
const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {}); // jest -> vi

describe('Schema Versioning', () => {

  beforeEach(() => {
    consoleWarnSpy.mockClear();
  });

  afterAll(() => {
    consoleWarnSpy.mockRestore();
  });

  describe('Constants', () => {
    it('SCHEMA_VERSIONS should contain known versions', () => {
      expect(SCHEMA_VERSIONS.v2).toBe('memory_document_v2');
      // Add checks for future versions when they are added
    });

    it('LATEST_SCHEMA_VERSION should be the latest known version', () => {
      // Currently only v2 exists
      expect(LATEST_SCHEMA_VERSION).toBe(SCHEMA_VERSIONS.v2);
    });
  });

  describe('isKnownSchemaVersion', () => {
    it('should return true for known schema versions', () => {
      expect(isKnownSchemaVersion('memory_document_v2')).toBe(true);
    });

    it('should return false for unknown schema versions', () => {
      expect(isKnownSchemaVersion('memory_document_v1')).toBe(false);
      expect(isKnownSchemaVersion('v2')).toBe(false);
      expect(isKnownSchemaVersion('')).toBe(false);
      expect(isKnownSchemaVersion(null as any)).toBe(false);
      expect(isKnownSchemaVersion(undefined as any)).toBe(false);
    });

    it('should work as a type guard', () => {
      const versionString: string = 'memory_document_v2';
      let knownVersion: SchemaVersion | undefined;

      if (isKnownSchemaVersion(versionString)) {
        // Inside this block, versionString should be narrowed to type SchemaVersion
        knownVersion = versionString;
        expect(knownVersion).toBe('memory_document_v2');
      } else {
        // Should not reach here in this test case
        throw new Error('Type guard failed');
      }
      expect(knownVersion).toBeDefined();
    });
  });

  describe('migrateDocumentToLatest (Placeholder)', () => {
    it('should return the document as is if schema is the latest version', () => {
      const doc = { schema: LATEST_SCHEMA_VERSION, content: { data: 'test' } };
      const migratedDoc = migrateDocumentToLatest(doc);
      expect(migratedDoc).toBe(doc); // Should return the same object instance for now
      expect(consoleWarnSpy).not.toHaveBeenCalled();
    });

    it('should return the document as is and log a warning if schema is unknown', () => {
      const doc = { schema: 'unknown_version', content: { data: 'old' } };
      const migratedDoc = migrateDocumentToLatest(doc);
      expect(migratedDoc).toBe(doc);
      expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('unknown or missing schema version: unknown_version'));
    });

    it('should return the document as is and log a warning if schema is missing', () => {
      const doc = { content: { data: 'no schema' } };
      const migratedDoc = migrateDocumentToLatest(doc);
      expect(migratedDoc).toBe(doc);
       // Check for undefined schema in warning message
      expect(consoleWarnSpy).toHaveBeenCalledWith(expect.stringContaining('unknown or missing schema version: undefined'));
    });

    // TODO: Add tests for actual migration logic when implemented
    // e.g., it('should migrate v1 document to v2 format', () => { ... });
  });
});