test(server): migrate to node internal test (#2000)

apps/server/src/config/__tests__/config.spec.ts

@@ -1,30 +0,0 @@
-import { Test } from '@nestjs/testing';
-import test from 'ava';
-
-import { Config, ConfigModule } from '..';
-
-let config: Config;
-test.beforeEach(async () => {
-  const module = await Test.createTestingModule({
-    imports: [ConfigModule.forRoot()],
-  }).compile();
-  config = module.get(Config);
-});
-
-test('should be able to get config', t => {
-  t.assert(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');
-});