feat: add sapling tree root test

librustzcash-wrapper/src/lib.rs

@@ -1602,6 +1602,18 @@ pub extern "C" fn rust_wrapper_combine_sapling_nodes(
     }
 }
 
+#[no_mangle]
+pub extern "C" fn rust_wrapper_get_sapling_root(
+    level: u8,
+    out: *mut u8,
+    out_len: &mut usize
+    ){
+    let tree: CommitmentTree<Node, 32> = CommitmentTree::empty();
+    let root = tree.root();
+    let h = Hhex { bytes: root.to_bytes().to_vec() };
+    marshall_to_haskell_var(&h, out, out_len, RW);
+}
+
 #[no_mangle]
 pub extern "C" fn rust_wrapper_read_orchard_frontier(
     tree: *const u8,

src/C/Zcash.chs

@@ -262,6 +262,13 @@ import ZcashHaskell.Types
   -> `()'
 #}
 
+{# fun unsafe rust_wrapper_get_sapling_root as rustWrapperGetSaplingRootTest
+     { `Int8'
+     , getVarBuffer `Buffer HexString'&
+     }
+  -> `()'
+#}
+
 {# fun unsafe rust_wrapper_read_orchard_node as rustWrapperReadOrchardNode
      { toBorshVar* `BS.ByteString'&
      , getVarBuffer `Buffer HexString'&

src/ZcashHaskell/Sapling.hs

@@ -20,6 +20,7 @@ module ZcashHaskell.Sapling where
 import C.Zcash
   ( rustWrapperCombineSaplingNodes
   , rustWrapperDecodeSaplingAddress
+  , rustWrapperGetSaplingRootTest
   , rustWrapperIsShielded
   , rustWrapperReadSaplingCommitmentTree
   , rustWrapperReadSaplingFrontier
@@ -206,6 +207,10 @@ combineSaplingNodes level n1 n2 =
       withPureBorshVarBuffer $
       rustWrapperCombineSaplingNodes level (toBytes n1) (toBytes n2)
 
+getSaplingRootTest :: Int8 -> HexString
+getSaplingRootTest level =
+  withPureBorshVarBuffer $ rustWrapperGetSaplingRootTest level
+
 getSaplingFrontier :: SaplingCommitmentTree -> Maybe SaplingFrontier
 getSaplingFrontier tree =
   if sf_pos updatedTree > 1