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c
At the risk of being annoying 😁: What was your initial thought? (I’m just noticing you seen to have a lot of ideas and I love that. The more ideas the better).
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In the spirit of being less annoying: My first reaction would be to “unwind the loop” so you end up with a tf file a resource for each engine:
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resource "aws_db_instance" "aurora" { 
  engine = "aurora"
  instance_class = "db.t3.small"
}

resource "aws_db_instance" "aurora-mysql" { 
  engine = "aurora-mysql"
  instance_class = "db.t3.small"
}

...
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p
My initial idea was to have a resource for each of them. I think it won't have a sensible impact on the speed of tests.
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Seeing this test reminded me of so many conditions that we are probably not handling correctly in the code. Since we do not have a test for all possible permutation of enum configs. I don't know how but I think we have to think about it some point in the future.
c
You mean how we have a test for “aurora” “db.t3.small”, but not one “aurora” “db.t3.medium”, right? That’s interesting,
Seems like it would be nice if we somehow at least had visibility into what permutations we’re not testing.
p
Sorry for late response, yes that's exactly what I mean. There are two kinds of uncovered cases: 1. Simple cases: where there is no special logic involved and we can just be sure about the pricing API coverage 2. Complex cases: These are where we have if, select statements and ... for instance when the field 
A
value is 
X
then we set the query field 
B
to 
Z
. These are where most errors are. I personally can think of at-least 2-3 times that my code had such errors and the reviewer found it.
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c
What’s a concrete example of #2?
p
Take https://github.com/infracost/infracost/blob/master/internal/providers/terraform/google/storage_bucket.go#L48 as an eaxmple: 
resourceGroup
is based on the value of 
storageClass
(there is a probability of typos here). Then if 
resourceGroup
is regional and we have certain 
location
field we have to change the 
resourceGroup
. So it's kind of a nested switch statement.
c
Ok yeah I see what you mean.
w
Does the https://fuzzbuzz.io/what-is-fuzz-testing/ > “Coverage Guided Fuzzing” seem interesting? If so, let me know if you’d like me to arrange a quick demo call with them this Wed/Thu, I know the founders…
p
That would probably cover some areas but I'm not sure if that could be the best strategy. I think we have to think more about the possible solutions.
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