### Question:
MerkleTree { public MerkleTree rightTree() { return (rightTree); } MerkleTree(MessageDigest md); void add(final MerkleTree leftTree, final MerkleTree rightTree); void add(final Leaf leftLeaf, final Leaf rightLeaf); MerkleTree leftTree(); MerkleTree rightTree(); Leaf leftLeaf(); Leaf rightLeaf(); byte[] digest(); void prettyPrint();  }### Answer:
@Test public final void testRightTree() { MerkleTree rightTree = merkleTree.rightTree(); Leaf leftLeaf = rightTree.leftLeaf(); Leaf rightLeaf = rightTree.rightLeaf(); assertTrue(leftLeaf.toString().equals(leftLeafString)); assertTrue(rightLeaf.toString().equals(rightLeafString)); }