Add parsing (not executing) of deposit tests

tests/ef_tests/src/cases/operations_deposit.rs

@@ -0,0 +1,34 @@
+use super::*;
+use serde_derive::Deserialize;
+use types::{BeaconState, Deposit, EthSpec};
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct OperationsDeposit<E: EthSpec> {
+    pub description: String,
+    #[serde(bound = "E: EthSpec")]
+    pub pre: BeaconState<E>,
+    pub deposit: Deposit,
+    #[serde(bound = "E: EthSpec")]
+    pub post: Option<BeaconState<E>>,
+}
+
+impl<E: EthSpec> YamlDecode for OperationsDeposit<E> {
+    fn yaml_decode(yaml: &String) -> Result<Self, Error> {
+        Ok(serde_yaml::from_str(&yaml.as_str()).unwrap())
+    }
+}
+
+impl<T: EthSpec> EfTest for Cases<OperationsDeposit<T>> {
+    fn test_results<E: EthSpec>(&self) -> Vec<CaseResult> {
+        self.test_cases
+            .iter()
+            .enumerate()
+            .map(|(i, tc)| {
+                // TODO: run test
+                let result = Ok(());
+
+                CaseResult::new(i, tc, result)
+            })
+            .collect()
+    }
+}