### Question:
MerkleTree { public Leaf rightLeaf() { return (rightLeaf); } 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 testRightLeaf() { Leaf rightLeaf = leafTree.rightLeaf(); assertTrue(rightLeaf.toString().equals(rightLeafString)); }