copied builder and setup tests

eth2/state_processing/src/per_block_processing/tests.rs

@@ -0,0 +1,23 @@
+#![cfg(test)]
+use crate::per_block_processing;
+use super::block_processing_builder::BlockProcessingBuilder;
+use types::*;
+
+pub const VALIDATOR_COUNT: usize = 10;
+
+#[test]
+fn runs_without_error() {
+    let spec = ChainSpec::foundation();
+    let mut builder = BlockProcessingBuilder::new(VALIDATOR_COUNT, &spec);
+
+    // 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);
+
+    per_block_processing(&mut state, &block, &spec).unwrap();
+}
+