SigningProcess seems to not effect the ScriptContext in the emulator

[Yasuke]

Summary

When the signing process is set (like in the Spec.MultiSig module of the use-cases-testsuit). It doesn't seem the signatures are added to the transaction.

In the latest plutus, after looking at the Spec module of use-cases it looks like the reason for this is needing to adopt a newer signing API.

Steps to reproduce the behavior

1. clone plutus-apps
2. run nix-shell
3. cd into the plutus-use-cases repo
4. cabal repl plutus-use-cases-test
5. ghci> import Test.Tasty
6. ghci> import Spec.MultiSig
7. ghci> defaultMain tests
8. wait for test to fail

Actual Result

2 out of 3 tests failed (0.01s)

is the output from my machine

Expected Result

I expect the tests will pass once the update to the new signing api is complete.

Describe the approach you would take to fix this

No response

System info

OS: NixOS
Plutus: 4127e9cd6e889824d724c30eae55033cb50cbf3e

[sjoerdvisscher]

The SigningProcess code looks old to me and I think it should be removed. Do you need it for something?