diff --git a/eth2/state_processing/src/per_block_processing/tests.rs b/eth2/state_processing/src/per_block_processing/tests.rs
index 004f84805..c9318bc63 100644
--- a/eth2/state_processing/src/per_block_processing/tests.rs
+++ b/eth2/state_processing/src/per_block_processing/tests.rs
@@ -13,7 +13,7 @@ fn runs_without_error() {
     // Set the state and block to be in the last slot of the 4th epoch.
     let last_slot_of_epoch = (spec.genesis_epoch + 4).end_slot(spec.slots_per_epoch);
     builder.set_slot(last_slot_of_epoch, &spec);
-    
+
     builder.build_caches(&spec);
     
     let (block, mut state) = builder.build(&spec);
@@ -21,3 +21,76 @@ fn runs_without_error() {
     per_block_processing(&mut state, &block, &spec).unwrap();
 }
 
+//  process_block_header
+//      Invalid::StateSlotMismatch
+//      Invalid::ParentBlockRootMismatch
+
+//  verify_block_signature
+//      Invalid::BadSignature
+
+//  process_randao
+//      Invalid::BadRandaoSignature
+
+//  process_proposer_slashings
+//      Invalid::MaxProposerSlashingsExceeded
+//      verify_proposer_slashing
+//          Invalid::ProposerUnknown
+//          Invalid::ProposalSlotMismatch
+//          Invalid::ProposalsIdentical
+//          Invalid::ProposerAlreadySlashed
+//          Invalid::ProposerAlreadyWithdrawn
+//          Invalid::BadProposal1Signature
+//          Invalid::BadProposal2Signature
+
+//  process_attester_slashings
+//      Invalid::MaxAttesterSlashingsExceed
+//      verify_attester_slashing
+//          Invalid::AttestationDataIdentical
+//          Invalid::NotSlashable
+//          Invalid::SlashableAttestation1Invalid
+//          Invalid::SlashableAttestation2Invalid
+
+//  process_attestations
+//      Invalid::MaxAttestationsExceeded
+//      validate_attestation
+//          Invalid::PreGenesis
+//          Invalid::IncludedTooLate
+//          Invalid::IncludedTooEarly
+//          Invalid::BadPreviousCrosslink
+//          Invalid::AggregationBitfieldIsEmpty
+//          Invalid::CustodyBitfieldHasSetBits
+//          Invalid::NoCommitteeForShard
+//          Invalid::BadCustodyBitfieldLength
+//          Invalid::BadAggregationBitfieldLength
+//          Invalid::ShardBlockRootNotZero
+//          verify_justified_epoch_and_root
+//              Invalid::WrongJustifiedEpoch (current)
+//              Invalid::WrongJustifiedRoot (current)
+//              Invalid::WrongJustifiedEpoch (previous)
+//              Invalid::WrongJustifiedRoot (previous)
+//          verify_attestation_signature
+//              Invalid::BadAggregationBitfieldLength
+//              Invalid::BadCustodyBitfieldLength  
+//              BeaconStateError::UnknownValidator
+//              Invalid::BadSignature
+
+//  process_deposits
+//      Invalid::MaxDepositsExceeded
+//      verify_deposit
+//          Invalid::BadProofOfPossession
+//          Invalid::BadMerkleProof
+//      verify_deposit_index
+//          Invalid::BadIndex
+
+//  process_exits
+//      Invalid::MaxExitsExceeded
+//      verify_exit
+//          Invalid::ValidatorUnknown
+//          Invalid::AlreadyExited
+//          Invalid::AlreadyInitiatedExited
+//          Invalid::FutureEpoch
+//          Invalid::TooYoungToLeave
+//          Invalid::BadSignature
+
+
+