refactor(infra): directory structure (#4615)

packages/backend/server/tests/config.spec.ts

@@ -0,0 +1,35 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import test from 'ava';
+
+import { Config, ConfigModule } from '../src/config';
+
+let config: Config;
+let module: TestingModule;
+test.beforeEach(async () => {
+  module = await Test.createTestingModule({
+    imports: [ConfigModule.forRoot()],
+  }).compile();
+  config = module.get(Config);
+});
+
+test.afterEach.always(async () => {
+  await module.close();
+});
+
+test('should be able to get config', t => {
+  t.true(typeof config.host === 'string');
+  t.is(config.env, 'test');
+});
+
+test('should be able to override config', async t => {
+  const module = await Test.createTestingModule({
+    imports: [
+      ConfigModule.forRoot({
+        host: 'testing',
+      }),
+    ],
+  }).compile();
+  const config = module.get(Config);
+
+  t.is(config.host, 'testing');
+});