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https://stackoverflow.com/questions/76009185/how-to-mock-pulumi-resources-in-go-unit-tests might help You should just be able to override NewResource in the mocks to return data expected for your program.

I've tried! But in all those examples those parameters are simple types, but here it's ecs.TaskDefinition I've tried this in many variations:

func (mocks) NewResource(args pulumi.MockResourceArgs) (string, resource.PropertyMap, error) {
> outputs := args.Inputs.Mappable()
> if args.TypeToken == "awsx:ecs:FargateTaskDefinition" {
> > outputs["taskDefinition"] = (&ecs.TaskDefinition{Arn: pulumi.String("fake").ToStringOutput()}).ToTaskDefinitionOutput()

> }
> outputs["arn"] = "arn:aws:ecs:ap-southeast-6:123451234512:fake-arn/fakeresource"
> return args.Name + "_id", resource.NewPropertyMapFromMap(outputs), nil
}

and other things constructing map of parameters, thinking it'll deserialise it into a proper object, which didn't work either