diff --git a/src/test/java/org/unicitylabs/sdk/mtree/sum/SparseMerkleSumTreeTest.java b/src/test/java/org/unicitylabs/sdk/mtree/sum/SparseMerkleSumTreeTest.java
index c54a3c1..4e805bf 100644
--- a/src/test/java/org/unicitylabs/sdk/mtree/sum/SparseMerkleSumTreeTest.java
+++ b/src/test/java/org/unicitylabs/sdk/mtree/sum/SparseMerkleSumTreeTest.java
@@ -11,6 +11,30 @@
 
 class SparseMerkleSumTreeTest {
 
+  @Test
+  void shouldAgreeWithSpecExamples() throws Exception {
+    var treeLeftOnly = new SparseMerkleSumTree(HashAlgorithm.SHA256);
+    treeLeftOnly.addLeaf(new BigInteger("100", 2), new LeafValue("a".getBytes(), BigInteger.valueOf(1)));
+    var rootLeftOnly = treeLeftOnly.calculateRoot();
+    Assertions.assertEquals(BigInteger.valueOf(1), rootLeftOnly.getValue());
+    Assertions.assertEquals('"' + "0000" + "34e0cf342d70c0d10e3ba481f72db532ecfd723afa3c25812a4bef61b5198d0b" + '"', rootLeftOnly.getRootHash().toJson());
+
+    var treeRightOnly = new SparseMerkleSumTree(HashAlgorithm.SHA256);
+    treeRightOnly.addLeaf(new BigInteger("111", 2), new LeafValue("b".getBytes(), BigInteger.valueOf(2)));
+    var rootRightOnly = treeRightOnly.calculateRoot();
+    Assertions.assertEquals(BigInteger.valueOf(2), rootRightOnly.getValue());
+    Assertions.assertEquals('"' + "0000" + "da47d1cda8dab5159b2bed1ea27c3d24ed990989fac3c62ace05273fea51f958" + '"', rootRightOnly.getRootHash().toJson());
+
+    var treeFourLeaves = new SparseMerkleSumTree(HashAlgorithm.SHA256);
+    treeFourLeaves.addLeaf(new BigInteger("1000", 2), new LeafValue("a".getBytes(), BigInteger.valueOf(1)));
+    treeFourLeaves.addLeaf(new BigInteger("1100", 2), new LeafValue("b".getBytes(), BigInteger.valueOf(2)));
+    treeFourLeaves.addLeaf(new BigInteger("1011", 2), new LeafValue("c".getBytes(), BigInteger.valueOf(3)));
+    treeFourLeaves.addLeaf(new BigInteger("1111", 2), new LeafValue("d".getBytes(), BigInteger.valueOf(4)));
+    var rootFourLeaves = treeFourLeaves.calculateRoot();
+    Assertions.assertEquals(BigInteger.valueOf(10), rootFourLeaves.getValue());
+    Assertions.assertEquals('"' + "0000" + "adfefa7c86b18d1216eece9fe0ce82ca58fd8cf482305c3c4e1a0a1361dc9d15" + '"', rootFourLeaves.getRootHash().toJson());
+  }
+
   @Test
   void shouldBuildTreeWithNumericValues() throws Exception {
     var leaves = Map.of(