Add v0.8 genesis tests (#466)

Closes #452

tests/ef_tests/src/cases/genesis_initialization.rs

@@ -0,0 +1,45 @@
+use super::*;
+use crate::bls_setting::BlsSetting;
+use crate::case_result::compare_beacon_state_results_without_caches;
+use serde_derive::Deserialize;
+use state_processing::initialize_beacon_state_from_eth1;
+use types::{BeaconState, Deposit, EthSpec, Hash256};
+
+#[derive(Debug, Clone, Deserialize)]
+#[serde(bound = "E: EthSpec")]
+pub struct GenesisInitialization<E: EthSpec> {
+    pub description: String,
+    pub bls_setting: Option<BlsSetting>,
+    pub eth1_block_hash: Hash256,
+    pub eth1_timestamp: u64,
+    pub deposits: Vec<Deposit>,
+    pub state: Option<BeaconState<E>>,
+}
+
+impl<E: EthSpec> YamlDecode for GenesisInitialization<E> {
+    fn yaml_decode(yaml: &str) -> Result<Self, Error> {
+        Ok(serde_yaml::from_str(yaml).unwrap())
+    }
+}
+
+impl<E: EthSpec> Case for GenesisInitialization<E> {
+    fn description(&self) -> String {
+        self.description.clone()
+    }
+
+    fn result(&self, _case_index: usize) -> Result<(), Error> {
+        self.bls_setting.unwrap_or_default().check()?;
+        let spec = &E::default_spec();
+
+        let mut result = initialize_beacon_state_from_eth1(
+            self.eth1_block_hash,
+            self.eth1_timestamp,
+            self.deposits.clone(),
+            spec,
+        );
+
+        let mut expected = self.state.clone();
+
+        compare_beacon_state_results_without_caches(&mut result, &mut expected)
+    }
+}