在具有内存数据库的 NestJs 的 e2e 测试中创建多个同名连接

Question

我有使用 mysql 配置了 TypeORM 的 NestJs 应用程序。我想进行 e2e(integration) 测试，因此我想在以这种方式配置的测试中使用内存数据库：

{
    type: 'sqlite',
    database: ':memory:',
    synchronize: true,
    dropSchema: true,
    entities: [`dist/**/*.entity{.ts,.js}`],
}

以及测试的设置

beforeEach(async () => {
        const moduleFixture: TestingModule =
            await Test.createTestingModule({imports: [AppModule, UserModule]})
                .overrideProvider(TypeOrmConfigService).useClass(MockTypeOrmConfigService)
                .compile();

        app = await moduleFixture.createNestApplication();
        await app.init();
    });

. 运行测试时我得到了

AlreadyHasActiveConnectionError: Cannot create a new connection named "default", because connection with such name already exist and it now has an active connection session.
    at new AlreadyHasActiveConnectionError (/Users/user/workspace/app/src/error/AlreadyHasActiveConnectionError.ts:8:9)
    at ConnectionManager.Object.<anonymous>.ConnectionManager.create (/Users/user/workspace/app/src/connection/ConnectionManager.ts:57:23)
    at Object.<anonymous> (/Users/user/workspace/app/src/index.ts:228:35)
    at step (/Users/user/workspace/app/node_modules/tslib/tslib.js:136:27)
    at Object.next (/Users/user/workspace/app/node_modules/tslib/tslib.js:117:57)
    at /Users/user/workspace/app/node_modules/tslib/tslib.js:110:75
    at new Promise (<anonymous>)
    at Object.__awaiter (/Users/user/workspace/app/node_modules/tslib/tslib.js:106:16)
    at Object.createConnection (/Users/user/workspace/app/node_modules/typeorm/index.js:186:20)
    at rxjs_1.defer (/Users/user/workspace/app/node_modules/@nestjs/typeorm/dist/typeorm-core.module.js:151:29)
(node:19140) UnhandledPromiseRejectionWarning: AlreadyHasActiveConnectionError: Caught error after test environment was torn down

如果我从 beforeAll 块中的 beforeEach 中移动设置，那没问题，但我担心当我创建几个规范时，错误会回来。应该如何妥善处理？

编辑：问题是每个测试都在设置应用程序，因此会创建一个新连接。解决方案是使用“keepConnectionAlive：true”，以便所有测试重用相同的连接。

Answer 1

keepCOnnectionAlive: true是要走的路