added calculate merkle root test (#79)

Author: usebeforefree

test/knowledge_collection_tools_test.py

@@ -512,3 +512,29 @@ def test_creating_new_graphs_error(self):
 _:c14n4 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> _:c14n1 ."""
 
         assert exc.value.message.strip() == expected_message
+
+
+class TestCalculateMerkleRoot:
+    def test_calculate_merkle_root_with_example_data(self):
+        """Test calculate_merkle_root function with real-world example data."""
+        quads = [
+            '<urn:us-cities:info:new-york> <http://schema.org/area> "468.9 sq mi" .',
+            '<urn:us-cities:info:new-york> <http://schema.org/name> "New York" .',
+            '<urn:us-cities:info:new-york> <http://schema.org/population> "8,336,817" .',
+            '<urn:us-cities:info:new-york> <http://schema.org/state> "New York" .',
+            "<urn:us-cities:info:new-york> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/City> .",
+            '<uuid:6fd70e74-369d-4398-bdf3-1f25bfbf551c> <https://ontology.origintrail.io/dkg/1.0#privateMerkleRoot> "0xaac2a420672a1eb77506c544ff01beed2be58c0ee3576fe037c846f97481cefd" .',
+            "<https://ontology.origintrail.io/dkg/1.0#metadata-hash:0x5cb6421dd41c7a62a84c223779303919e7293753d8a1f6f49da2e598013fe652> <https://ontology.origintrail.io/dkg/1.0#representsPrivateResource> <uuid:e0367b5c-a594-4131-8870-746f5551fa36> .",
+            "<https://ontology.origintrail.io/dkg/1.0#metadata-hash:0x6a2292b30c844d2f8f2910bf11770496a3a79d5a6726d1b2fd3ddd18e09b5850> <https://ontology.origintrail.io/dkg/1.0#representsPrivateResource> <uuid:4ccd8930-90d4-4d6d-9aba-150fca68e18d> .",
+            "<https://ontology.origintrail.io/dkg/1.0#metadata-hash:0xc1f682b783b1b93c9d5386eb1730c9647cf4b55925ec24f5e949e7457ba7bfac> <https://ontology.origintrail.io/dkg/1.0#representsPrivateResource> <uuid:0bb24334-91b8-431c-917a-c6c868325277> .",
+        ]
+
+        merkle_root = kc_tools.calculate_merkle_root(quads)
+
+        # Expected merkle root for this dataset
+        expected_merkle_root = (
+            "0x897442f7db61619b9f272c69d787975f169d0624d7f08c216017c3218c8ea5da"
+        )
+
+        # Verify the result matches the expected value
+        assert merkle_root == expected_merkle_root