Test signing error cases.
Ported from Rust: check_sign_errors
This function tests that signing fails when there are not enough commitments in the signing package.
The ciphersuite to test
The signing package
The signer's nonces
The signer's key package
Test signing error cases.
Ported from Rust: check_sign_errors
This function tests that signing fails when there are not enough commitments in the signing package.