Verifying struct keys presence in tests

Question

assert Contract.fetch(contract: valid_address) == %Contract{
         contract: "0x3D29Aa78fB558F84112bbC48a84F371147A920C9",
         name: "bla",
         price: nil,
         price_bnb: nil,
         call_id: 7,
         symbol: nil,
         transactions: []
       }

this test passes, however the Contract struct includes more keys than listed here in the test, how can I make this test fail if not all keys are provided?

What do you mean by "not provided"? Do you mean `nil`? Or do you mean "not present on the struct". Because keys are _always_ present on the struct. — Peaceful James, May 02 '21 at 15:39

score 0 · Answer 1 · edited May 03 '21 at 17:40

0

Use pattern matching in ExUnit.Assertions.assert/1 instead of equality check.

assert %Contract{
         contract: "0x3D29" <> _,
         name: "bla",
       } = Contract.fetch(contract: valid_address)

edited May 03 '21 at 17:40

Everett

8,746
5
35
49

answered May 02 '21 at 12:11

Aleksei Matiushkin

119,336
10
100
160

thanks, but still if I miss specifying one key on the left side the test passes – John Smith May 02 '21 at 12:22
I do not follow. Structs are not maps, you cannot “miss” a key. If not specified, it contains the default value and still plays in pattern-matching. – Aleksei Matiushkin May 02 '21 at 12:25

Verifying struct keys presence in tests

1 Answers1