Design Patterns MCP Server

import { describe, it, expect, beforeAll, afterAll } from 'vitest'; import { DatabaseManager } from '../../src/services/database-manager'; import { MigrationManager } from '../../src/services/migrations'; describe('Database Migration', () => { let dbManager: DatabaseManager; let migrationManager: MigrationManager; beforeAll(async () => { // Use in-memory database for proper test isolation dbManager = new DatabaseManager({ filename: ':memory:', options: { readonly: false }, }); await dbManager.initialize(); migrationManager = new MigrationManager(dbManager, './migrations'); await migrationManager.initialize(); // Execute all pending migrations const result = await migrationManager.migrate(); if (!result.success) { throw new Error(`Migration failed: ${result.message}`); } }); afterAll(async () => { await dbManager.close(); }); it('should execute initial migration', async () => { // Check if migrations table exists and has records const migrationRecords = dbManager.query('SELECT * FROM schema_migrations'); const migrationExecuted = migrationRecords && migrationRecords.length > 0; expect(migrationExecuted).toBe(true); }); it('should handle migration versioning', async () => { // Check if migration records exist const migrationRecords = dbManager.query( 'SELECT id, checksum FROM schema_migrations ORDER BY id' ); const versionTracked = migrationRecords && migrationRecords.length > 0 && migrationRecords.every((record: any) => record.id && record.checksum); expect(versionTracked).toBe(true); }); it('should rollback failed migrations', async () => { // Arrange: Get current migration status const statusBefore = await migrationManager.getStatus(); const initialExecuted = statusBefore.executed; // Act: Rollback the last migration const rollbackResult = await migrationManager.rollback(1); // Assert: Verify rollback was successful expect(rollbackResult.success).toBe(true); expect(rollbackResult.rolledBack).toBeDefined(); expect(rollbackResult.rolledBack!.length).toBe(1); // Verify migration was actually rolled back const statusAfter = await migrationManager.getStatus(); expect(statusAfter.executed).toBe(initialExecuted - 1); // Re-run migrations to restore state for other tests const migrateResult = await migrationManager.migrate(); expect(migrateResult.success).toBe(true); }); it('should create required database tables', async () => { // Check if all required tables exist const tables = dbManager.query(` SELECT name FROM sqlite_master WHERE type='table' AND name IN ( 'patterns', 'pattern_embeddings', 'pattern_relationships', 'pattern_implementations', 'schema_migrations' ) `); const requiredTables = [ 'patterns', 'pattern_embeddings', 'pattern_relationships', 'pattern_implementations', 'schema_migrations', ]; const existingTables = tables.map((row: any) => row.name); const allTablesExist = requiredTables.every(table => existingTables.includes(table)); expect(allTablesExist).toBe(true); }); it('should migrate pattern data', async () => { // Check if patterns table exists and has correct structure const tableInfo = dbManager.query(` PRAGMA table_info(patterns) `); const hasRequiredColumns = tableInfo && tableInfo.length >= 8 && // id, name, category, description, when_to_use, benefits, drawbacks, use_cases, complexity, tags, created_at, updated_at tableInfo.some((col: any) => col.name === 'id' && col.type === 'TEXT') && tableInfo.some((col: any) => col.name === 'name' && col.type === 'TEXT') && tableInfo.some((col: any) => col.name === 'category' && col.type === 'TEXT'); expect(hasRequiredColumns).toBe(true); }); it('should validate migration integrity', async () => { // Check if all expected tables have data const tablesWithData = dbManager.query(` SELECT name FROM sqlite_master WHERE type='table' AND name IN ('patterns', 'pattern_embeddings') `); const integrityValid = tablesWithData && tablesWithData.length >= 2; expect(integrityValid).toBe(true); }); // Mutation Testing: Test edge cases and error conditions it('should handle invalid migration files gracefully', async () => { // Create a separate migration manager with invalid migration path const invalidMigrationManager = new MigrationManager(dbManager, '/nonexistent/path'); const migrations = await invalidMigrationManager.getAvailableMigrations(); expect(migrations).toEqual([]); }); it('should support migration validation', async () => { // Test that validation runs without throwing const validation = await migrationManager.validate(); // Validation should return a result object expect(validation).toHaveProperty('valid'); expect(validation).toHaveProperty('errors'); expect(Array.isArray(validation.errors)).toBe(true); // Note: In development, checksums may not match due to file modifications // This is acceptable for testing purposes }); it('should handle migration status correctly', async () => { const status = await migrationManager.getStatus(); expect(status).toBeDefined(); expect(typeof status.total).toBe('number'); expect(typeof status.executed).toBe('number'); expect(typeof status.pending).toBe('number'); expect(status.executed).toBeGreaterThan(0); expect(status.pending).toBe(0); // All should be executed }); it('should prevent duplicate migration execution', async () => { // Try to migrate again - should have no pending migrations const result = await migrationManager.migrate(); expect(result.success).toBe(true); expect(result.message).toBe('No pending migrations'); expect(result.executed).toEqual([]); }); it('should support gradual migration (Strangler Fig pattern)', async () => { // Reset database state for this test dbManager.execute('DELETE FROM schema_migrations'); const result = await migrationManager.migrateGradually({ dryRun: true }); expect(result.success).toBe(true); expect(result.executed!.length).toBeGreaterThan(0); }); it('should validate single migrations', async () => { const available = await migrationManager.getAvailableMigrations(); const firstMigration = available[0]; // This is a private method, but we're testing the concept // In a real scenario, this would be tested through public APIs expect(firstMigration).toBeDefined(); expect(firstMigration.up).toBeDefined(); expect(firstMigration.down).toBeDefined(); }); it('should handle checksum resolution', async () => { const available = await migrationManager.getAvailableMigrations(); const firstMigration = available[0]; // Test checksum calculation const checksum1 = (migrationManager as any).calculateChecksum(firstMigration.up); const checksum2 = (migrationManager as any).calculateChecksum(firstMigration.up); expect(checksum1).toBe(checksum2); // Should be deterministic expect(typeof checksum1).toBe('string'); expect(checksum1.length).toBeGreaterThan(0); }); it('should provide health status', async () => { const health = await migrationManager.getHealthStatus(); expect(health).toHaveProperty('totalMigrations'); expect(health).toHaveProperty('executedMigrations'); expect(health).toHaveProperty('pendingMigrations'); expect(health).toHaveProperty('healthy'); expect(health).toHaveProperty('issues'); expect(Array.isArray(health.issues)).toBe(true); }); it('should support dry run validation', async () => { const dryRun = await migrationManager.dryRun(); expect(dryRun).toHaveProperty('success'); expect(dryRun).toHaveProperty('message'); expect(dryRun).toHaveProperty('migrations'); expect(Array.isArray(dryRun.migrations)).toBe(true); }); it('should handle migration options', async () => { const options = { validateFirst: true, continueOnError: false, maxRetries: 3, retryDelay: 100, dryRun: false, forceChecksumUpdate: false, skipFailedMigrations: false, }; // Test that options are accepted (migrate should work with these options) const result = await migrationManager.migrate(options); expect(result).toHaveProperty('success'); expect(result).toHaveProperty('message'); }); describe('DDL Migration Error Handling', () => { let testDbManager: DatabaseManager; let testMigrationManager: MigrationManager; beforeEach(async () => { // Create a fresh in-memory database for each test testDbManager = new DatabaseManager({ filename: `:memory:${Date.now()}-${Math.random()}`, options: { readonly: false }, }); await testDbManager.initialize(); testMigrationManager = new MigrationManager(testDbManager, './migrations'); await testMigrationManager.initialize(); }); afterEach(async () => { await testDbManager.close(); }); it('should validate DDL migration execution - tables created', async () => { // Create a test migration that creates a table const uniqueId = Date.now(); const testMigration = { id: `999_test_validation_${uniqueId}`, name: 'Test DDL Validation', up: `CREATE TABLE test_validation_table_${uniqueId} (id INTEGER PRIMARY KEY, name TEXT);`, down: `DROP TABLE test_validation_table_${uniqueId};`, createdAt: new Date(), }; // Execute the migration await (testMigrationManager as any).executeMigration(testMigration); // Verify the table was created const tables = testDbManager.query( `SELECT name FROM sqlite_master WHERE type='table' AND name='test_validation_table_${uniqueId}'` ); expect(tables.length).toBe(1); expect(tables[0].name).toBe(`test_validation_table_${uniqueId}`); }); it('should validate DDL migration execution - indexes created', async () => { // First create a table const uniqueId = Date.now(); testDbManager.execDDL( `CREATE TABLE test_index_table_${uniqueId} (id INTEGER PRIMARY KEY, name TEXT);` ); // Create a test migration that creates an index const testMigration = { id: `999_test_index_validation_${uniqueId}`, name: 'Test Index DDL Validation', up: `CREATE INDEX idx_test_index_table_name_${uniqueId} ON test_index_table_${uniqueId}(name);`, down: `DROP INDEX idx_test_index_table_name_${uniqueId};`, createdAt: new Date(), }; // Execute the migration await (testMigrationManager as any).executeMigration(testMigration); // Verify the index was created const indexes = testDbManager.query( `SELECT name FROM sqlite_master WHERE type='index' AND name='idx_test_index_table_name_${uniqueId}'` ); expect(indexes.length).toBe(1); expect(indexes[0].name).toBe(`idx_test_index_table_name_${uniqueId}`); }); it('should fail DDL validation when table is not created', async () => { // Create a migration with invalid DDL syntax const uniqueId = Date.now(); const testMigration = { id: `999_test_invalid_ddl_${uniqueId}`, name: 'Test Invalid DDL', up: `CREATE TABLE test_validation_table_${uniqueId} (id INTEGER PRIMARY KEY, name TEXT); INVALID SQL SYNTAX HERE;`, down: '', createdAt: new Date(), }; // This should fail due to syntax error await expect((testMigrationManager as any).executeMigration(testMigration)).rejects.toThrow(); }); it('should rollback DDL migration on failure', async () => { // Create a migration that creates a table then fails const uniqueId = Date.now(); const testMigration = { id: `999_test_rollback_${uniqueId}`, name: 'Test DDL Rollback', up: `CREATE TABLE test_rollback_table_${uniqueId} (id INTEGER PRIMARY KEY); INVALID SQL SYNTAX HERE;`, down: `DROP TABLE IF EXISTS test_rollback_table_${uniqueId};`, createdAt: new Date(), }; // Execute should fail and rollback await expect( (testMigrationManager as any).executeMigrationWithRetry(testMigration, {}) ).rejects.toThrow(); // Verify the table was rolled back (doesn't exist) const tables = testDbManager.query( `SELECT name FROM sqlite_master WHERE type='table' AND name='test_rollback_table_${uniqueId}'` ); expect(tables.length).toBe(0); }); it('should extract created objects from DDL statements', () => { const extractMethod = (testMigrationManager as any).extractCreatedObjects.bind( testMigrationManager ); // Test table extraction const tableObjects = extractMethod('CREATE TABLE IF NOT EXISTS test_table (id INTEGER);'); expect(tableObjects).toEqual(['test_table']); // Test index extraction const indexObjects = extractMethod('CREATE INDEX idx_test_table_name ON test_table(name);'); expect(indexObjects).toEqual(['idx_test_table_name']); // Test unique index extraction const uniqueIndexObjects = extractMethod( 'CREATE UNIQUE INDEX idx_unique_test ON test_table(email);' ); expect(uniqueIndexObjects).toEqual(['idx_unique_test']); }); it('should check if database objects exist', async () => { // Create a test table testDbManager.execDDL('CREATE TABLE test_existence_table (id INTEGER PRIMARY KEY);'); const existsMethod = (testMigrationManager as any).objectExists.bind(testMigrationManager); // Test existing table const tableExists = await existsMethod('test_existence_table'); expect(tableExists).toBe(true); // Test non-existing table (use a unique name to avoid conflicts) const tableNotExists = await existsMethod('definitely_not_a_table_12345'); expect(tableNotExists).toBe(false); }); it('should handle DDL migration retry with rollback', async () => { let attemptCount = 0; const uniqueId = Date.now(); const testMigration = { id: `999_test_retry_${uniqueId}`, name: 'Test Retry with Rollback', up: `CREATE TABLE retry_test_table_${uniqueId} (id INTEGER PRIMARY KEY, name TEXT);`, down: `DROP TABLE retry_test_table_${uniqueId};`, createdAt: new Date(), }; // Mock the executeMigration to fail twice then succeed const originalExecute = (testMigrationManager as any).executeMigration; (testMigrationManager as any).executeMigration = async (migration: any) => { attemptCount++; if (attemptCount < 3) { // Create partial state then fail testDbManager.execDDL( `CREATE TABLE retry_test_table_${uniqueId} (id INTEGER PRIMARY KEY);` ); throw new Error('Simulated failure'); } // On third attempt, succeed return originalExecute.call(testMigrationManager, migration); }; // Should succeed after retries await (testMigrationManager as any).executeMigrationWithRetry(testMigration, { maxRetries: 3, }); // Verify final state const tables = testDbManager.query( `SELECT name FROM sqlite_master WHERE type='table' AND name='retry_test_table_${uniqueId}'` ); expect(tables.length).toBe(1); expect(attemptCount).toBe(3); // Should have failed twice, succeeded on third }); }); });