Support for mongodb-memory-server version 7.x

[LinusU]

Version 7.x added support for my platform (arm64), but it doesn't seem like we are compatible with version 7.x yet. I'm getting the following error:

  ● Test suite failed to run

    "instanceInfo" is undefined

      at assertionInstanceInfo (node_modules/mongodb-memory-server-core/src/MongoMemoryServer.ts:721:38)
      at MongoMemoryServer.getUri (node_modules/mongodb-memory-server-core/src/MongoMemoryServer.ts:632:5)
      at EphemeralEnvironment.setup (node_modules/jest-environment-mongodb/src/index.ts:46:47)

related: nodkz/mongodb-memory-server#213

[snitovets]

from 7.x.x versions MongoMemoryServer instance have to starts manually:

mongod = new MongoMemoryServer();
await mongod.start();

const mongoUri = mongo.getUri();

await mongoose.connect(mongoUri, {
	useCreateIndex: true,
	useNewUrlParser: true,
	useUnifiedTopology: true
});

[lirbank]

Hey, thanks for posting this issue! I personally hold mongodb-memory-server to version 6.x because of the same reasons as you, so this is definitely something I am interested in fixing. Just got to find the time. Would be happy to accept a PR too if you have the inclination.

Potentially related (or not), I have an old branch with some work to support replicasets. Not sure if mongodb-memory-server 7.x makes this any easier, need to explore that when the time comes.

[boredland]

Hi there! Created a PR that should squash all the deprecations at once, including this one. Would appreciate a review! #28