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# typescript

sparse-intern-71089

01/04/2022, 2:07 PM

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little-cartoon-10569

01/04/2022, 8:07 PM

The

setMock

function takes an object that must have a

call

function. This function is where you fake out calls to Pulumi functions.

little-cartoon-10569

01/04/2022, 8:07 PM

In this case, it is the way to go.

little-cartoon-10569

01/04/2022, 8:08 PM

The docs show where the code goes, but there's no example code: https://www.pulumi.com/docs/guides/testing/unit/#add-mocks

little-cartoon-10569

01/04/2022, 8:09 PM

However there is an example of the

aws.ec2.getAmi()

function being faked here: https://github.com/pulumi/examples/blob/947273e7a62cf31649559344b2dd8df78bddacd9/testing-unit-ts/mocha/ec2tests.ts#L44

crooked-dawn-93088

01/05/2022, 7:51 PM

Thanks for the hints but it doesn't seem that the getter can be mocked within the

call

function of the mocks. I logged

args.token

of all invokations to the console and none of them where matching but I still had this error message.

Copy code

[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason "Error: failed to read resource #undefined 'default' [aws:ec2/securityGroup:SecurityGroup]: req.getCustom is not a function".] {
  code: 'ERR_UNHANDLED_REJECTION'
}

Anyway I considered that I do not need to export the whole

securityGroup

just the

securityGroupId

that I already got from the VPC so problem solved. 🙂

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