Issue with initialising mock wallet with native token in EmulatorTrace

[Brian Jing]

Summary

When initialising EmulatorConfig with wallets with only lovelace, it's fine, but as soon as I introduce native tokens, it throws error complaining about not being able to deserialise the policy ID of the token.

Here's the error message:

Test suite cardano-plutus-v2-test-test: RUNNING...
Test
  Token deposit tests
    Can deposit token into contract: FAIL
      Cannot build the initial state: Tag "toCardanoPolicyId" (Tag "56 bytes" DeserialisationError)
      CallStack (from HasCallStack):
        error, called at src/Wallet/Emulator/Stream.hs:166:12 in plts-cntrct-1.0.0.0-989ebfa8:Wallet.Emulator.Stream

1 out of 1 tests failed (0.03s)
Test suite cardano-plutus-v2-test-test: FAIL

Here's the test code that will fail because of this: https://github.com/bjing/cardano-plutus-v2-test/blob/main/test/Spec/DepositTrace.hs

Steps to reproduce the behavior

• Enter nix shell through plutus-apps repo, make sure you are on commit d4255f05477fd8477ee9673e850ebb9ebb8c9657 on the next-node branch.
• Check out repo: https://github.com/bjing/cardano-plutus-v2-test
• Run cabal test under the project.

Actual Result

Cannot build the initial state of the EmulatorTrace because of the following native token definition:

assetClass
    (currencySymbol "5cb39e252088575b32ab13f235b18c0297b1e987185e2b27d9975999")
    (tokenName "TokenName")

Expected Result

EmulatorTrace should not actually be doing checks on the policy id validity. it should just accept whatever string I throw at it as the policy id.

Even if it checks on policy id validity, it should be happy with the legit policy id I put in there.

Describe the approach you would take to fix this

No response

System info

OS: MacOS Monterey
Version: 12.6
Plutus apps branch: next-node
Plutus apps commit: d4255f0

[James]

The CurrencySymbol hash is too long.

> currencySymbol "5cb39e252088575b32ab13f235b18c0297b1e987185e2b27d9975999"
3563623339653235323038383537356233326162313366323335623138633032393762316539383731383565326232376439393735393939

> fromString "5cb39e252088575b32ab13f235b18c0297b1e987185e2b27d9975999" :: CurrencySymbol
5cb39e252088575b32ab13f235b18c0297b1e987185e2b27d9975999

Try using fromString when defining your CurrencySymbol.

[Brian Jing]

Oh wow, thanks so much for taking the time to look at this. Of course I was doing it wrong!

🙇‍♂️ .