Fix warnings and clippy lints

beacon_node/beacon_chain/test_harness/src/beacon_chain_harness.rs

@@ -10,10 +10,7 @@ use fork_choice::BitwiseLMDGhost;
 use log::debug;
 use rayon::prelude::*;
 use slot_clock::TestingSlotClock;
-use ssz::TreeHash;
 use std::collections::HashSet;
-use std::fs::File;
-use std::io::prelude::*;
 use std::iter::FromIterator;
 use std::sync::Arc;
 use types::*;
@@ -291,12 +288,4 @@ impl BeaconChainHarness {
     pub fn chain_dump(&self) -> Result<Vec<CheckPoint>, BeaconChainError> {
         self.beacon_chain.chain_dump()
     }
-
-    /// Write the output of `chain_dump` to a JSON file.
-    pub fn dump_to_file(&self, filename: String, chain_dump: &[CheckPoint]) {
-        let json = serde_json::to_string(chain_dump).unwrap();
-        let mut file = File::create(filename).unwrap();
-        file.write_all(json.as_bytes())
-            .expect("Failed writing dump to file.");
-    }
 }

beacon_node/beacon_chain/test_harness/src/validator_harness/local_signer.rs

@@ -1,27 +1,16 @@
 use attester::Signer as AttesterSigner;
 use block_proposer::Signer as BlockProposerSigner;
-use std::sync::RwLock;
 use types::{Keypair, Signature};
 
 /// A test-only struct used to perform signing for a proposer or attester.
 pub struct LocalSigner {
     keypair: Keypair,
-    should_sign: RwLock<bool>,
 }
 
 impl LocalSigner {
     /// Produce a new TestSigner with signing enabled by default.
     pub fn new(keypair: Keypair) -> Self {
-        Self {
-            keypair,
-            should_sign: RwLock::new(true),
-        }
-    }
-
-    /// If set to `false`, the service will refuse to sign all messages. Otherwise, all messages
-    /// will be signed.
-    pub fn enable_signing(&self, enabled: bool) {
-        *self.should_sign.write().unwrap() = enabled;
+        Self { keypair }
     }
 
     /// Sign some message.