Add tests and benches for epoch processing

eth2/state_processing/src/epoch_processable.rs

@@ -9,6 +9,8 @@ use types::{
     Crosslink, Epoch, Hash256, InclusionError, PendingAttestation, RelativeEpoch,
 };
 
+mod tests;
+
 macro_rules! safe_add_assign {
     ($a: expr, $b: expr) => {
         $a = $a.saturating_add($b);
@@ -725,11 +727,3 @@ impl From<BeaconStateError> for WinningRootError {
         WinningRootError::BeaconStateError(e)
     }
 }
-
-#[cfg(test)]
-mod tests {
-    #[test]
-    fn it_works() {
-        assert_eq!(2 + 2, 4);
-    }
-}

eth2/state_processing/src/epoch_processable/tests.rs

@@ -0,0 +1,21 @@
+#![cfg(test)]
+use crate::EpochProcessable;
+use env_logger::{Builder, Env};
+use types::beacon_state::BeaconStateBuilder;
+use types::*;
+
+#[test]
+fn runs_without_error() {
+    Builder::from_env(Env::default().default_filter_or("error")).init();
+
+    let mut builder = BeaconStateBuilder::with_random_validators(8);
+    builder.spec = ChainSpec::few_validators();
+
+    builder.genesis().unwrap();
+    builder.teleport_to_end_of_epoch(builder.spec.genesis_epoch + 4);
+
+    let mut state = builder.build().unwrap();
+
+    let spec = &builder.spec;
+    state.per_epoch_processing(spec).unwrap();
+}