diff --git a/beacon_node/beacon_chain/Cargo.toml b/beacon_node/beacon_chain/Cargo.toml
index d6dac9a4b..7e157dffb 100644
--- a/beacon_node/beacon_chain/Cargo.toml
+++ b/beacon_node/beacon_chain/Cargo.toml
@@ -5,6 +5,7 @@ authors = ["Paul Hauner <paul@paulhauner.com>"]
 edition = "2018"
 
 [dependencies]
+block_producer = { path = "../../eth2/block_producer" }
 bls = { path = "../../eth2/utils/bls" }
 boolean-bitfield = { path = "../../eth2/utils/boolean-bitfield" }
 db = { path = "../db" }
diff --git a/beacon_node/beacon_chain/tests/chain.rs b/beacon_node/beacon_chain/tests/chain.rs
index 9c76bf59d..390d48ea4 100644
--- a/beacon_node/beacon_chain/tests/chain.rs
+++ b/beacon_node/beacon_chain/tests/chain.rs
@@ -1,12 +1,77 @@
 use beacon_chain::{BeaconChain, BlockProcessingOutcome};
-use bls::Signature;
+#[cfg(test)]
+use block_producer::{
+    test_utils::{TestEpochMap, TestSigner},
+    BeaconNode as BeaconBlockNode, BeaconNodeError as BeaconBlockNodeError, BlockProducer,
+};
 use db::{
     stores::{BeaconBlockStore, BeaconStateStore},
     MemoryDB,
 };
 use slot_clock::TestingSlotClock;
 use spec::ChainSpec;
-use std::sync::Arc;
+use std::sync::{Arc, RwLock};
+use types::{BeaconBlock, Keypair};
+
+struct DirectBeaconNode();
+
+impl BeaconBlockNode for DirectBeaconNode {
+    fn produce_beacon_block(&self, slot: u64) -> Result<Option<BeaconBlock>, BeaconBlockNodeError> {
+        Err(BeaconBlockNodeError::DecodeFailure)
+    }
+
+    /// Returns the value specified by the `set_next_publish_result`.
+    fn publish_beacon_block(&self, block: BeaconBlock) -> Result<bool, BeaconBlockNodeError> {
+        Err(BeaconBlockNodeError::DecodeFailure)
+    }
+}
+
+struct Validator {
+    block_producer: BlockProducer<TestingSlotClock, DirectBeaconNode, TestEpochMap, TestSigner>,
+    spec: Arc<ChainSpec>,
+    epoch_map: Arc<TestEpochMap>,
+    keypair: Keypair,
+    beacon_node: Arc<DirectBeaconNode>,
+    slot_clock: Arc<RwLock<TestingSlotClock>>,
+    signer: Arc<TestSigner>,
+}
+
+impl Validator {
+    pub fn new() -> Self {
+        let spec = Arc::new(ChainSpec::foundation());
+        let keypair = Keypair::random();
+        let slot_clock = Arc::new(RwLock::new(TestingSlotClock::new(0)));
+        let signer = Arc::new(TestSigner::new(keypair.clone()));
+        let beacon_node = Arc::new(DirectBeaconNode());
+        let epoch_map = Arc::new(TestEpochMap::new());
+
+        let block_producer = BlockProducer::new(
+            spec.clone(),
+            epoch_map.clone(),
+            slot_clock.clone(),
+            beacon_node.clone(),
+            signer.clone(),
+        );
+
+        Self {
+            block_producer,
+            spec,
+            epoch_map,
+            keypair,
+            beacon_node,
+            slot_clock,
+            signer,
+        }
+    }
+}
+
+fn generate_validators(n: usize) -> Vec<Validator> {
+    let mut validators = Vec::with_capacity(n);
+    for _ in 0..n {
+        validators.push(Validator::new());
+    }
+    validators
+}
 
 fn in_memory_test_stores() -> (
     Arc<MemoryDB>,
@@ -34,6 +99,7 @@ fn it_constructs() {
     let (_db, _chain) = in_memory_test_chain(ChainSpec::foundation());
 }
 
+/*
 #[test]
 fn it_produces() {
     let (_db, mut chain) = in_memory_test_chain(ChainSpec::foundation());
@@ -48,3 +114,4 @@ fn it_processes_a_block_it_produces() {
     assert_eq!(outcome, BlockProcessingOutcome::Processed);
     assert_eq!(chain.canonical_leaf_block, new_block_hash);
 }
+*/