Fix some compilation errors in tests

common/eth2/src/lib.rs

@@ -751,7 +751,7 @@ impl BeaconNodeHttpClient {
     /// Returns `Ok(None)` on a 404 error.
     pub async fn post_beacon_blinded_blocks_ssz<T: EthSpec, Payload: AbstractExecPayload<T>>(
         &self,
-        block: &SignedBlindedBlockContents<T>,
+        block: &SignedBlockContents<T, Payload>,
     ) -> Result<(), Error> {
         let mut path = self.eth_path(V1)?;
 

common/eth2/src/types.rs

@@ -1431,6 +1431,26 @@ impl<T: EthSpec, Payload: AbstractExecPayload<T>> BlockContents<T, Payload> {
             BlockContents::Block(block) => (block, None),
         }
     }
+
+    /// Signs `self`, producing a `SignedBlockContents`.
+    pub fn sign(
+        self,
+        secret_key: &SecretKey,
+        fork: &Fork,
+        genesis_validators_root: Hash256,
+        spec: &ChainSpec,
+    ) -> SignedBlockContents<T, Payload> {
+        let (block, maybe_blobs) = self.deconstruct();
+        let signed_block = block.sign(secret_key, fork, genesis_validators_root, spec);
+        let signed_blobs = maybe_blobs.map(|blobs| {
+            blobs
+                .into_iter()
+                .map(|blob| blob.sign(secret_key, fork, genesis_validators_root, spec))
+                .collect::<Vec<_>>()
+                .into()
+        });
+        SignedBlockContents::new(signed_block, signed_blobs)
+    }
 }
 
 impl<T: EthSpec, Payload: AbstractExecPayload<T>> ForkVersionDeserialize