refactor and properly close db connections

tests/basic/index.test.ts

@@ -4,7 +4,7 @@ import path from 'path'
 import { TypedData } from 'ydb-sdk'
 import extractMetadata from '../../src/metadata/extractMetadata'
 import generateSchema from '../../src/schema'
-import database from '../database'
+import { getDatabase } from '../database'
 import setupTable from '../setupTable'
 import accessTable from './tables/access'
 import userTable from './tables/user'
@@ -13,8 +13,8 @@ import userData from './tables/user/data'
 const dirname = __dirname.split('/').pop()
 
 beforeAll(async () => {
-  const timeout = 4500 // Should be less then Jest timeout
-  await database.ready(timeout)
+  const database = await getDatabase()
+
   await database.tableClient.withSession(async (session) =>
     Promise.all([
       setupTable(session, `${dirname}/user`, userTable, userData),
@@ -24,17 +24,22 @@ beforeAll(async () => {
 })
 
 afterAll(async () => {
+  const database = await getDatabase()
+
   await database.tableClient.withSession(async (session) =>
     Promise.all([
       session.dropTable(`${dirname}/user`),
       session.dropTable(`${dirname}/access`)
     ])
   )
   await database.schemeClient.removeDirectory(dirname!)
+
+  await database.destroy()
 })
 
 describe('my database tests', () => {
-  test('should insert data into the database', async () => {
+  it('should insert data into the database', async () => {
+    const database = await getDatabase()
     const query = `SELECT * FROM \`${dirname}/user\` where id = 1`
     const result = await database.tableClient.withSessionRetry(
       async (session) => {
@@ -45,7 +50,9 @@ describe('my database tests', () => {
     )
     expect(result[0]['id']).toBe(1)
   })
-  test('should generate correct schema', async () => {
+
+  it('should generate correct schema', async () => {
+    const database = await getDatabase()
     const base = path.join(__dirname, './metadata')
     const metadata = await extractMetadata(base)
     const gotSchema = await generateSchema(database, metadata)