feat: Adjust global hooks to work with both knex and objection

packages/backend/src/types/global.d.ts

@@ -1,8 +1,11 @@
 import { Knex } from 'knex';
+import { Transaction } from 'objection';
 
 declare global {
   declare namespace globalThis {
     // eslint-disable-next-line no-var
-    var knex: Knex;
+    var knexInstance: Knex;
+    // eslint-disable-next-line no-var
+    var knex: Transaction;
   }
 }

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

@@ -1,17 +1,27 @@
+import { transaction, Model } from 'objection';
 import { client as knex } from '../../src/config/database';
+import logger from '../../src/helpers/logger';
 
 global.beforeAll(async () => {
-  global.knex = knex;
+  global.knexInstance = knex;
+  global.knex = null;
+  logger.silent = true;
 });
 
-global.beforeEach(async function () {
-  this.transaction = await global.knex.transaction();
+global.beforeEach(async () => {
+  // It's assigned as global.knex for the convenience even though
+  // it's a transaction. It's rolled back after each test.
+  // by assigning to knex, we can use it as knex.table('example') in tests files.
+  global.knex = await transaction.start(knex);
+  Model.knex(global.knex);
 });
 
-global.afterEach(async function () {
-  await this.transaction.rollback();
+global.afterEach(async () => {
+  await global.knex.rollback();
+  Model.knex(knex);
 });
 
 global.afterAll(async () => {
-  global.knex.destroy();
+  global.knexInstance.destroy();
+  logger.silent = false;
 });