Discussion on: Unit Testing AWS Lambda Functions in Node.js

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Replies for: The deps property does get created first, along with the rest of the lamdba, but it gets overwritten in beforeEach. Because the deps property is wr...

Thanks for the info. In the example given will running the unit tests still result in connecting to the dynamodb database via 'const documentClient = new AWS.DynamoDB.DocumentClient()'

Alex Manarpies • Dec 10 '18

I double-checked by setting a breakpoint and it's not being triggered. Notice that the deps property is actually a function:

exports.deps = () => { // notice the closure syntax
  const AWS = require('aws-sdk')
  const documentClient = new AWS.DynamoDB.DocumentClient()

  return Promise.resolve({
    dynamoBatchWrite: params => documentClient.batchWrite(params).promise()
  })
}

.. its body contents should only be run when deps is invoked as a function (in this case async).

harkinj • Dec 11 '18

Perfect, thanks for your time and this great article.