Fix CI

- Fix bitrot CI
- Fix clippy beta
- Rename our tests module by test_circuits (and the corresponding files and folders)

Author: ConstanceBeguier

.github/workflows/ci.yml

@@ -97,6 +97,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+      - run: sudo apt-get -y install libfontconfig1-dev
       # Check bitrot with stable (as we don't need benchmarks or the test-dev-graph
       # feature flag to work with MSRV).
       - uses: ./.github/actions/prepare

halo2_gadgets/src/ecc.rs

@@ -597,7 +597,7 @@ pub(crate) mod tests {
         FixedPoints,
     };
     use crate::{
-        tests::test_utils::test_against_stored_circuit,
+        test_circuits::test_utils::test_against_stored_circuit,
         utilities::lookup_range_check::{PallasLookupRangeCheck, PallasLookupRangeCheckConfig},
     };
 

halo2_gadgets/src/lib.rs

@@ -30,4 +30,4 @@ pub mod sinsemilla;
 pub mod utilities;
 
 #[cfg(test)]
-mod tests;
+mod test_circuits;

halo2_gadgets/src/sinsemilla.rs

@@ -473,7 +473,7 @@ pub(crate) mod tests {
             NonIdentityPoint, ScalarFixed,
         },
         sinsemilla::primitives::{self as sinsemilla, K},
-        tests::test_utils::test_against_stored_circuit,
+        test_circuits::test_utils::test_against_stored_circuit,
         utilities::lookup_range_check::{PallasLookupRangeCheck, PallasLookupRangeCheckConfig},
     };
 

halo2_gadgets/src/sinsemilla/merkle.rs

@@ -171,6 +171,7 @@ where
 }
 
 #[cfg(test)]
+/// Sinsemilla Merkle tree tests.
 pub mod tests {
     use super::{
         chip::{MerkleChip, MerkleConfig},
@@ -184,7 +185,7 @@ pub mod tests {
             tests::{TestCommitDomain, TestHashDomain},
             HashDomains,
         },
-        tests::test_utils::test_against_stored_circuit,
+        test_circuits::test_utils::test_against_stored_circuit,
         utilities::{
             i2lebsp,
             lookup_range_check::{PallasLookupRangeCheck, PallasLookupRangeCheckConfig},