feat: Introduce backend test suite with ava

packages/backend/src/config/app.ts

@@ -1,6 +1,12 @@
 import { URL } from 'node:url';
 import * as dotenv from 'dotenv';
-dotenv.config();
+import path from 'path';
+
+if (process.env.APP_ENV === 'test') {
+  dotenv.config({ path: path.resolve(__dirname, '../../.env.test') });
+} else {
+  dotenv.config();
+}
 
 type AppConfig = {
   host: string;

packages/backend/src/graphql/queries/get-user.test.ts

@@ -0,0 +1,8 @@
+import test from 'ava';
+
+const fn = () => 'foo';
+
+test('getUser graphQL query', (t) => {
+  // TODO: Write a test for getUser graphQL query
+  t.is(fn(), 'foo');
+});