diff --git a/beacon_node/beacon_chain/src/test_utils.rs b/beacon_node/beacon_chain/src/test_utils.rs
index a2dcdeefe..d2abcadd0 100644
--- a/beacon_node/beacon_chain/src/test_utils.rs
+++ b/beacon_node/beacon_chain/src/test_utils.rs
@@ -837,16 +837,6 @@ where
             .collect()
     }
 
-    pub fn get_finalized_checkpoints(&self) -> HashSet<SignedBeaconBlockHash> {
-        let chain_dump = self.chain.chain_dump().unwrap();
-        chain_dump
-            .iter()
-            .cloned()
-            .map(|checkpoint| checkpoint.beacon_state.finalized_checkpoint().root.into())
-            .filter(|block_hash| *block_hash != Hash256::zero().into())
-            .collect()
-    }
-
     /// Deprecated: Do not modify the slot clock manually; rely on add_attested_blocks_at_slots()
     ///             instead
     ///
@@ -863,18 +853,6 @@ where
         self.chain.slot_clock.set_current_time(time);
     }
 
-    /// Deprecated: Use make_block() instead
-    ///
-    /// Returns a newly created block, signed by the proposer for the given slot.
-    pub async fn build_block(
-        &self,
-        state: BeaconState<E>,
-        slot: Slot,
-        _block_strategy: BlockStrategy,
-    ) -> (SignedBeaconBlock<E>, BeaconState<E>) {
-        self.make_block(state, slot).await
-    }
-
     /// Uses `Self::extend_chain` to build the chain out to the `target_slot`.
     pub async fn extend_to_slot(&self, target_slot: Slot) -> Hash256 {
         if self.chain.slot().unwrap() == self.chain.canonical_head.cached_head().head_slot() {
@@ -1086,6 +1064,16 @@ where
         self.chain.canonical_head.cached_head().head_block_root()
     }
 
+    pub fn get_finalized_checkpoints(&self) -> HashSet<SignedBeaconBlockHash> {
+        let chain_dump = self.chain.chain_dump().unwrap();
+        chain_dump
+            .iter()
+            .cloned()
+            .map(|checkpoint| checkpoint.beacon_state.finalized_checkpoint().root.into())
+            .filter(|block_hash| *block_hash != Hash256::zero().into())
+            .collect()
+    }
+
     pub fn finalized_checkpoint(&self) -> Checkpoint {
         self.chain
             .canonical_head
@@ -1141,6 +1129,18 @@ where
         state.get_block_root(slot).unwrap() == state.get_block_root(slot - 1).unwrap()
     }
 
+    /// Deprecated: Use make_block() instead
+    ///
+    /// Returns a newly created block, signed by the proposer for the given slot.
+    pub async fn build_block(
+        &self,
+        state: BeaconState<E>,
+        slot: Slot,
+        _block_strategy: BlockStrategy,
+    ) -> (SignedBeaconBlock<E>, BeaconState<E>) {
+        self.make_block(state, slot).await
+    }
+
     pub async fn make_block(
         &self,
         mut state: BeaconState<E>,
@@ -2122,6 +2122,30 @@ where
             self.make_attestations(validators, state, state_root, block_hash, block.slot());
         self.process_attestations(attestations);
     }
+
+    pub fn process_sync_contributions(
+        &self,
+        sync_contributions: HarnessSyncContributions<E>,
+    ) -> Result<(), SyncCommitteeError> {
+        let mut verified_contributions = Vec::with_capacity(sync_contributions.len());
+
+        for (_, contribution_and_proof) in sync_contributions {
+            let signed_contribution_and_proof = contribution_and_proof.unwrap();
+
+            let verified_contribution = self
+                .chain
+                .verify_sync_contribution_for_gossip(signed_contribution_and_proof)?;
+
+            verified_contributions.push(verified_contribution);
+        }
+
+        for verified_contribution in verified_contributions {
+            self.chain
+                .add_contribution_to_block_inclusion_pool(verified_contribution)?;
+        }
+
+        Ok(())
+    }
 }
 
 // Junk `Debug` impl to satistfy certain trait bounds during testing.
diff --git a/beacon_node/beacon_chain/tests/rewards.rs b/beacon_node/beacon_chain/tests/rewards.rs
index b61bea124..a10368cbd 100644
--- a/beacon_node/beacon_chain/tests/rewards.rs
+++ b/beacon_node/beacon_chain/tests/rewards.rs
@@ -3,7 +3,8 @@
 use std::collections::HashMap;
 
 use beacon_chain::test_utils::{
-    generate_deterministic_keypairs, BeaconChainHarness, EphemeralHarnessType,
+    generate_deterministic_keypairs, BeaconChainHarness,
+    EphemeralTestingSlotClockHarnessType as HarnessType,
 };
 use beacon_chain::{
     test_utils::{AttestationStrategy, BlockStrategy, RelativeSyncCommittee},
@@ -17,7 +18,7 @@ lazy_static! {
     static ref KEYPAIRS: Vec<Keypair> = generate_deterministic_keypairs(VALIDATOR_COUNT);
 }
 
-fn get_harness<E: EthSpec>() -> BeaconChainHarness<EphemeralHarnessType<E>> {
+fn get_harness<E: EthSpec>() -> BeaconChainHarness<HarnessType<E>> {
     let mut spec = E::default_spec();
 
     spec.altair_fork_epoch = Some(Epoch::new(0)); // We use altair for all tests
diff --git a/consensus/types/src/beacon_state/tests.rs b/consensus/types/src/beacon_state/tests.rs
index dfbb496a0..333caf4ed 100644
--- a/consensus/types/src/beacon_state/tests.rs
+++ b/consensus/types/src/beacon_state/tests.rs
@@ -2,7 +2,7 @@
 use crate::test_utils::*;
 use crate::test_utils::{SeedableRng, XorShiftRng};
 use beacon_chain::test_utils::{
-    interop_genesis_state, test_spec, BeaconChainHarness,
+    interop_genesis_state_with_eth1, test_spec, BeaconChainHarness,
     EphemeralTestingSlotClockHarnessType as HarnessType, DEFAULT_ETH1_BLOCK_HASH,
 };
 use beacon_chain::types::{