Add unit tests for models and services

- Implemented unit tests for the Package model, covering methods such as generateId, findById, findByName, and version management.
- Created unit tests for the Repository model, including repository creation, name validation, and retrieval methods.
- Added tests for the Session model, focusing on session creation, validation, and invalidation.
- Developed unit tests for the User model, ensuring user creation, password hashing, and retrieval methods function correctly.
- Implemented AuthService tests, validating login, token refresh, and session management.
- Added TokenService tests, covering token creation, validation, and revocation processes.

test/helpers/db.helper.ts

@@ -0,0 +1,106 @@
+/**
+ * Database test helper - manages test database lifecycle
+ *
+ * NOTE: The smartdata models use a global `db` singleton. This helper
+ * ensures proper initialization and cleanup for tests.
+ */
+
+import * as plugins from '../../ts/plugins.ts';
+import { testConfig } from '../test.config.ts';
+
+// Test database instance - separate from production
+let testDb: plugins.smartdata.SmartdataDb | null = null;
+let testDbName: string = '';
+let isConnected = false;
+
+// We need to patch the global db export since models reference it
+// This is done by re-initializing with the test config
+import { initDb, closeDb } from '../../ts/models/db.ts';
+
+/**
+ * Initialize test database with unique name per test run
+ */
+export async function setupTestDb(config?: {
+  mongoUrl?: string;
+  dbName?: string;
+}): Promise<void> {
+  // If already connected, reuse the connection
+  if (isConnected && testDb) {
+    return;
+  }
+
+  const mongoUrl = config?.mongoUrl || testConfig.mongodb.url;
+
+  // Generate unique database name for this test session
+  const uniqueId = crypto.randomUUID().slice(0, 8);
+  testDbName = config?.dbName || `${testConfig.mongodb.name}-${uniqueId}`;
+
+  // Initialize the global db singleton with test configuration
+  testDb = await initDb(mongoUrl, testDbName);
+  isConnected = true;
+}
+
+/**
+ * Clean up test database - deletes all documents from collections
+ * This is safer than dropping collections which causes index rebuild issues
+ */
+export async function cleanupTestDb(): Promise<void> {
+  if (!testDb || !isConnected) return;
+
+  try {
+    const collections = await testDb.mongoDb.listCollections().toArray();
+    for (const col of collections) {
+      // Delete all documents but preserve indexes
+      await testDb.mongoDb.collection(col.name).deleteMany({});
+    }
+  } catch (error) {
+    console.warn('[TestHelper] Error cleaning database:', error);
+  }
+}
+
+/**
+ * Teardown test database - drops database and closes connection
+ */
+export async function teardownTestDb(): Promise<void> {
+  if (!testDb || !isConnected) return;
+
+  try {
+    // Drop the test database
+    await testDb.mongoDb.dropDatabase();
+    // Close the connection
+    await closeDb();
+    testDb = null;
+    isConnected = false;
+  } catch (error) {
+    console.warn('[TestHelper] Error tearing down database:', error);
+  }
+}
+
+/**
+ * Clear specific collection(s) - deletes all documents
+ */
+export async function clearCollections(...collectionNames: string[]): Promise<void> {
+  if (!testDb || !isConnected) return;
+
+  for (const name of collectionNames) {
+    try {
+      await testDb.mongoDb.collection(name).deleteMany({});
+    } catch {
+      // Collection may not exist, ignore
+    }
+  }
+}
+
+/**
+ * Get the current test database name
+ */
+export function getTestDbName(): string {
+  return testDbName;
+}
+
+/**
+ * Get the database instance for direct access
+ */
+export function getTestDb(): plugins.smartdata.SmartdataDb | null {
+  return testDb;
+}