feat: Add global hooks for jest

packages/backend/jest.config.js

@@ -2,4 +2,6 @@
 module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',
-};
+  setupFilesAfterEnv: ['./test/setup/global-hooks.ts'],
+  globalTeardown: './test/setup/global-teardown.ts',
+};

packages/backend/test/setup/global-hooks.ts

@@ -0,0 +1,17 @@
+import { client as knex } from '../../src/config/database';
+
+global.beforeAll(async () => {
+  global.knex = knex;
+});
+
+global.beforeEach(async function () {
+  this.transaction = await global.knex.transaction();
+});
+
+global.afterEach(async function () {
+  await this.transaction.rollback();
+});
+
+global.afterAll(async () => {
+  global.knex.destroy();
+});

packages/backend/test/setup/global-teardown.ts

@@ -0,0 +1,5 @@
+const exitProcess = (): void => {
+  process.exit(0);
+};
+
+export default exitProcess;