Dynamoose: How can you mock the database calls?

[jdcrecur]

Is it possible to mock the database calls with dynamoose?

I have looked into using https://www.npmjs.com/package/aws-sdk-mock but without much joy.. is there a preferred method to mock?

[brandongoode]

What is your main goal? You can use a local mock database the test: https://dynamoosejs.com/api#dynamooselocalurl

[fishcharlie]

Closing due to no reply. Please let us know if you are still having this issue and we can try to help further.

[Br0kensword]

So how does one go about mocking database calls from Dynamoose? I am trying to unit test a function that creates a user with the Model.create() function. How would I go about mocking that and returning a successful response so that my unit test passes?

[dolsem]

@Br0kensword One (not ideal) way to do testing is to use a local DynamoDB instance, which you can populate with a client like dynamon. However, I am myself curious about how to do actual request mocking.

[ckuiawa]

@brandongoode Using a local db is no longer really a unit test, it's more of an integration test. You also run the risk of setup data from one test effecting the results of other tests. I know it's possible for that to happen anyway, but I would think the likelihood is greater when using a local database.

[jacktuck]

@ckuiawa is right.

Sinon.js does the trick for me. Only just got it working but looking good.

const sandbox = sinon.createSandbox();

sandbox
  .stub(dynamoose, 'model')
  .returns({
    update: (args) => { ... }
  })

[ehtesham1996]

@jacktuck can you share full example if possible

[jacktuck]

@ehtesham1996 Sorry I don't have an example to hand. I'd maybe do something similar to how dynamoose mocks itself here https://github.com/dynamoose/dynamoose/blob/master/test/unit/Model.js#L79

[fishcharlie]

@ehtesham1996 This project I created, along with dynamoose.aws.ddb.set and dynamoose.aws.ddb.revert should do the trick.