Node.js overrideProvider（令牌）在Test.createTestingModule的nestJS中不工作

我在测试上下文中重写提供程序时遇到问题。我知道我漏掉了一些显而易见的东西，但我尝试了大量的排列，但没有一个有效，所以我要把这个告诉蜂群

我的结构如下：

共享的.module.ts

@Module({
    providers: [
        DatabaseProvider,
        ConfigService,
        CacheService
    ],
    exports: [
        DatabaseProvider,
        ConfigService
        CacheService
    ],
    imports: [HttpModule],
})

@Module({
    imports: [SharedModule, HttpModule],
    exports: [MyService],
    controllers: [MyController],
    providers: [MyService],
})

@Module({
    imports: [
        SharedModule,
        MyModule
    ],
    providers: [
        ...
    ],
    controllers: [
        ...
    ]
})

export class MyService {
    constructor(
        @Inject("MongoConnection") private readonly dbConnection: Connection,
        private _cache: CacheService
    ) { }
...
}

let cacheService = {...};
this.db = {...};

const module = await Test.createTestingModule({
        imports: [SharedModule, MyModule, HttpModule]
    })
    .overrideProvider(CacheService)
    .useValue(cacheService)
    .overrideProvider("MongoConnection")
    .useValue(this.db)
    .compile();

其中，DatabaseProvider定义为：

const DatabaseProvider = {
    provide: "MongoConnection",
    inject: [ConfigService],
    useFactory: async (config: ConfigService): Promise < typeof mongoose | Object > => {
        return await mongoose.connect(config.getString("MONGO_URI"), { useNewUrlParser: true });
    }
};

应用程序模块.ts

@Module({
    providers: [
        DatabaseProvider,
        ConfigService,
        CacheService
    ],
    exports: [
        DatabaseProvider,
        ConfigService
        CacheService
    ],
    imports: [HttpModule],
})

@Module({
    imports: [SharedModule, HttpModule],
    exports: [MyService],
    controllers: [MyController],
    providers: [MyService],
})

@Module({
    imports: [
        SharedModule,
        MyModule
    ],
    providers: [
        ...
    ],
    controllers: [
        ...
    ]
})

export class MyService {
    constructor(
        @Inject("MongoConnection") private readonly dbConnection: Connection,
        private _cache: CacheService
    ) { }
...
}

let cacheService = {...};
this.db = {...};

const module = await Test.createTestingModule({
        imports: [SharedModule, MyModule, HttpModule]
    })
    .overrideProvider(CacheService)
    .useValue(cacheService)
    .overrideProvider("MongoConnection")
    .useValue(this.db)
    .compile();

my.service.ts

@Module({
    providers: [
        DatabaseProvider,
        ConfigService,
        CacheService
    ],
    exports: [
        DatabaseProvider,
        ConfigService
        CacheService
    ],
    imports: [HttpModule],
})

@Module({
    imports: [SharedModule, HttpModule],
    exports: [MyService],
    controllers: [MyController],
    providers: [MyService],
})

@Module({
    imports: [
        SharedModule,
        MyModule
    ],
    providers: [
        ...
    ],
    controllers: [
        ...
    ]
})

export class MyService {
    constructor(
        @Inject("MongoConnection") private readonly dbConnection: Connection,
        private _cache: CacheService
    ) { }
...
}

let cacheService = {...};
this.db = {...};

const module = await Test.createTestingModule({
        imports: [SharedModule, MyModule, HttpModule]
    })
    .overrideProvider(CacheService)
    .useValue(cacheService)
    .overrideProvider("MongoConnection")
    .useValue(this.db)
    .compile();

my.spec.ts

@Module({
    providers: [
        DatabaseProvider,
        ConfigService,
        CacheService
    ],
    exports: [
        DatabaseProvider,
        ConfigService
        CacheService
    ],
    imports: [HttpModule],
})

@Module({
    imports: [SharedModule, HttpModule],
    exports: [MyService],
    controllers: [MyController],
    providers: [MyService],
})

@Module({
    imports: [
        SharedModule,
        MyModule
    ],
    providers: [
        ...
    ],
    controllers: [
        ...
    ]
})

export class MyService {
    constructor(
        @Inject("MongoConnection") private readonly dbConnection: Connection,
        private _cache: CacheService
    ) { }
...
}

let cacheService = {...};
this.db = {...};

const module = await Test.createTestingModule({
        imports: [SharedModule, MyModule, HttpModule]
    })
    .overrideProvider(CacheService)
    .useValue(cacheService)
    .overrideProvider("MongoConnection")
    .useValue(this.db)
    .compile();

我的问题是CacheService似乎被覆盖（它使用CacheService中定义的redis mock，而不是CacheService中的默认redis实现），但MongoConnection没有被覆盖-它仍在从shared.module.ts调用原始DatabaseProvider

---

有人能指出我遗漏了什么吗？

你真的用

@injection（）

而不是

@InjectConnection（）

来注入连接吗？啊，你不是在用

@nestjs/mongoose

，对吗？有人反对使用这个软件包吗？