fix: updated tests w new leaf hash

Author: shotaronowhere

contracts/test/bridge/merkle/MerkleTree.ts

@@ -31,7 +31,7 @@ export class MerkleTree {
    * @return node The `sha3` (A.K.A. `keccak256`) hash of `first, ...params` as a 32-byte hex string.
    */
   public static makeLeafNode(data: string): string {
-    const result = ethers.utils.sha256(data);
+    const result = ethers.utils.keccak256(data);
 
     if (!result) {
       throw new Error("Leaf node must not be empty");

contracts/test/bridge/merkle/index.ts

@@ -61,7 +61,7 @@ describe("Merkle", function () {
     });
   it("Should correctly verify all nodes in the tree", async () => {
     for (var message of data)  {
-      const leaf = ethers.utils.sha256(message);
+      const leaf = ethers.utils.keccak256(message);
       proof = mt.getHexProof(leaf);
       const validation = await merkleProof.validateProof(proof, message,rootOnChain);
       expect(validation).equal(true);