Add genesis tests pre modifying the beancon structs

beacon_chain/genesis/src/beacon_block.rs

@@ -47,4 +47,58 @@ mod tests {
         // This only checks that the function runs without panic.
         genesis_beacon_block(state_root, &spec);
     }
+
+    // Tests parent_root, randao_reveal, deposit_root are the zero hash after creation and slot == 0
+    #[test]
+    fn test_zero_items() {
+        let spec = ChainSpec::foundation();
+
+        // Note: state_root will not be available without a state (test in beacon_state)
+        let state_root = Hash256::zero();
+
+        let genesis_block = genesis_beacon_block(state_root, &spec);
+
+        assert!(genesis_block.parent_root.is_zero());
+        assert!(genesis_block.randao_reveal.is_zero());
+        assert!(genesis_block.slot == 0);
+        // assert!(genesis_block.depsoit_root.is_zero());
+
+    }
+
+    #[test]
+    fn test_beacon_body() {
+        let spec = ChainSpec::foundation();
+
+        // Note: state_root will not be available without a state (test in beacon_state)
+        let state_root = Hash256::zero();
+
+        let genesis_block = genesis_beacon_block(state_root, &spec);
+
+        assert!(genesis_block.body.proposer_slashings.is_empty());
+        assert!(genesis_block.body.casper_slashings.is_empty());
+        assert!(genesis_block.body.attestations.is_empty());
+        assert!(genesis_block.body.deposits.is_empty());
+        assert!(genesis_block.body.exits.is_empty());
+        // Specs have changed to include 3 more variables in BeaconBody to be added later
+    }
+
+    #[test]
+    fn test_signature() {
+        let spec = ChainSpec::foundation();
+
+        // Note: state_root will not be available without a state (test in beacon_state)
+        let state_root = Hash256::zero();
+
+        let genesis_block = genesis_beacon_block(state_root, &spec);
+
+        // Signature should consist of [bytes48(0), bytes48(0)]
+        // Note this is implemented using Apache Milagro BLS which requires one extra byte -> 97bytes
+        let raw_sig = genesis_block.signature.as_raw();
+        let raw_sig_bytes = raw_sig.as_bytes();
+
+        assert!(raw_sig_bytes.len() == 97);
+        for item in raw_sig_bytes.iter() {
+            assert!(*item == 0);
+        }    
+    }
 }