Add working tests for rest_api validator endpoint

beacon_node/rest_api/src/url_query.rs

@@ -1,5 +1,7 @@
+use crate::helpers::{parse_committee_index, parse_epoch, parse_signature, parse_slot};
 use crate::ApiError;
 use hyper::Request;
+use types::{CommitteeIndex, Epoch, Signature, Slot};
 
 /// Provides handy functions for parsing the query parameters of a URL.
 
@@ -77,6 +79,30 @@ impl<'a> UrlQuery<'a> {
             .collect();
         Ok(queries)
     }
+
+    /// Returns the value of the first occurrence of the `epoch` key.
+    pub fn epoch(self) -> Result<Epoch, ApiError> {
+        self.first_of(&["epoch"])
+            .and_then(|(_key, value)| parse_epoch(&value))
+    }
+
+    /// Returns the value of the first occurrence of the `slot` key.
+    pub fn slot(self) -> Result<Slot, ApiError> {
+        self.first_of(&["slot"])
+            .and_then(|(_key, value)| parse_slot(&value))
+    }
+
+    /// Returns the value of the first occurrence of the `committee_index` key.
+    pub fn committee_index(self) -> Result<CommitteeIndex, ApiError> {
+        self.first_of(&["committee_index"])
+            .and_then(|(_key, value)| parse_committee_index(&value))
+    }
+
+    /// Returns the value of the first occurrence of the `randao_reveal` key.
+    pub fn randao_reveal(self) -> Result<Signature, ApiError> {
+        self.first_of(&["randao_reveal"])
+            .and_then(|(_key, value)| parse_signature(&value))
+    }
 }
 
 #[cfg(test)]