[Question] How to unit test when using @feathersjs/mongodb?

[JPStrydom]

Question

When running a feathers app with MongoDB, how can one go about unit testing without having to connect to an actual MongoDB?

The documentation around test-database-setup (and this article) mentions that one can specify a local file path for nedb in the config/test.json file like so:

{
  "nedb": "../test/data"
}

The documentation and article also mentions that "The same thing can be done with connection strings for other databases.", but this does not seem to work for MongoDB.

I tried setting the following in the config/test.json file:

{
  "mongodb": "../test/data"
}

Which MongoDB doesn't seem to like.

Is there a recommended way by Feathers to mock out MongoDB? Looks like there are options like mongodb-memory-server and mongo-mock, but don't want to sink too much time into those if Feathers has a better way of achieving this.

Thanks!

System configuration

Module versions (especially the part that's not working):

• "@feathersjs/adapter-commons": "^5.0.23"
• "@feathersjs/feathers": "^5.0.23"
• "@feathersjs/mongodb": "^5.0.23"
• "mongodb": "^6.4.0",

NodeJS version: v20

[daffl]

We are using https://www.npmjs.com/package/mongodb-memory-server for testing, the setup is here: https://github.com/feathersjs/feathers/blob/dove/packages/mongodb/test/index.test.ts#L143