Preheating and unit tests

Author: spalladino

l1-contracts/src/core/libraries/rollup/STFLib.sol

@@ -70,6 +70,14 @@ library STFLib {
         blockLog.blobCommitmentsHash = bytes32(uint256(0x1));
       }
 
+      if (blockLog.attestationsHash == bytes32(0)) {
+        blockLog.attestationsHash = bytes32(uint256(0x1));
+      }
+
+      if (blockLog.payloadDigest == bytes32(0)) {
+        blockLog.payloadDigest = bytes32(uint256(0x1));
+      }
+
       store.tempBlockLogs[i] = blockLog.compress();
     }
   }

l1-contracts/test/Rollup.t.sol

@@ -861,7 +861,7 @@ contract RollupTest is RollupBase {
         end: _end,
         args: args,
         fees: fees,
-        attestations: CommitteeAttestations({signatureIndices: "", signaturesOrAddresses: ""}),
+        attestations: CommitteeAttestations({signatureIndices: "", signaturesOrAddresses: ""}), // TODO(palla): Add unit tests with non-empty attestations
         blobInputs: _blobInputs,
         proof: ""
       })